{"id":318,"date":"2024-10-23T11:25:42","date_gmt":"2024-10-23T02:25:42","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=318"},"modified":"2025-03-24T08:53:24","modified_gmt":"2025-03-23T23:53:24","slug":"%e3%80%90%e5%ae%8c%e5%85%a8%e8%a7%a3%e8%aa%ac%e3%80%91java-interface%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e8%ac%9b%e5%ba%a7%ef%bc%9a%e5%9f%ba%e7%a4%8e%e3%81%8b","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=318","title":{"rendered":"\u3010\u5b8c\u5168\u89e3\u8aac\u3011Java interface\u306e\u4f7f\u3044\u65b9\u30de\u30b9\u30bf\u30fc\u8b1b\u5ea7\uff1a\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u30677\u3064\u306e\u30b9\u30c6\u30c3\u30d7"},"content":{"rendered":"<div id=\"sgb-css-id-1\">\n<p>Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u3067\u3001\u3088\u308a\u67d4\u8edf\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u304c\u300cinterface\u300d\u3067\u3059\u3002interface\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u6982\u5ff5\u306e\u4e00\u3064\u3067\u3042\u308a\u3001\u9069\u5207\u306b\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u306f\u98db\u8e8d\u7684\u306b\u6539\u5584\u3055\u308c\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-2\">\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u521d\u7d1a\u301c\u4e2d\u7d1a\u30ec\u30d9\u30eb\u306e\u958b\u767a\u8005\u3001\u5b66\u751f\u3001\u305d\u3057\u3066\u65b0\u4eba\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u7686\u3055\u3093\u3092\u5bfe\u8c61\u306b\u3001interface\u306e\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067\u30017\u3064\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u5fb9\u5e95\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-3\">\n<p>\u4ee5\u4e0b\u306e\u5185\u5bb9\u3092\u901a\u3058\u3066\u3001\u3042\u306a\u305f\u306finterface\u306e\u9b45\u529b\u3068\u529b\u3092\u5b58\u5206\u306b\u7406\u89e3\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-4\">\n<li>interface\u306e\u57fa\u672c\u6982\u5ff5\u3068\u5f79\u5272<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-5\">\n<li>interface\u306e\u5b9f\u88c5\u65b9\u6cd5\u3068\u5177\u4f53\u7684\u306a\u4f7f\u7528\u4f8b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-6\">\n<li>Java 8\u4ee5\u964d\u306e\u65b0\u6a5f\u80fd\uff08default method\u3068static method\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-7\">\n<li>\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3078\u306e\u5fdc\u7528<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-8\">\n<li>\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u3068\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8<\/li>\n<\/div>\n\n\n<li>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-9\">\n<p>\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u307f\u7d42\u3048\u308b\u3068\u3001\u3042\u306a\u305f\u306f\u4ee5\u4e0b\u306e\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u8a18\u4e8b\u3067\u8eab\u306b\u3064\u304f\u3082\u306e<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-10\">\n<li>interface\u3092\u9069\u5207\u306b\u8a2d\u8a08\u30fb\u5b9f\u88c5\u3059\u308b\u80fd\u529b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-11\">\n<li>\u30b3\u30fc\u30c9\u306e\u67d4\u8edf\u6027\u3068\u518d\u5229\u7528\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u6280\u8853<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-12\">\n<li>\u5927\u898f\u6a21\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u901a\u7528\u3059\u308b\u758e\u7d50\u5408\u306a\u8a2d\u8a08\u624b\u6cd5<\/li>\n<\/div>\n\n\n<li>Java\u958b\u767a\u8005\u3068\u3057\u3066\u306e\u30ad\u30e3\u30ea\u30a2\u30a2\u30c3\u30d7\u306b\u5fc5\u8981\u306a\u77e5\u8b58<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-13\">\n<p>\u3055\u3042\u3001Java interface\u306e\u4e16\u754c\u3078\u98db\u3073\u8fbc\u307f\u3001\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30ad\u30eb\u3092\u6b21\u306e\u30ec\u30d9\u30eb\u3078\u5f15\u304d\u4e0a\u3052\u307e\u3057\u3087\u3046\uff01<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-14\">\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">1. Java interface\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308b\u57fa\u672c\u6982\u5ff5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">1.1 interface\u306e\u5b9a\u7fa9\u3068\u5f79\u5272\uff1a\u30b3\u30fc\u30c9\u306e\u67d4\u8edf\u6027\u3092\u9ad8\u3081\u308b\u9375<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">1.2 class\u3068interface\u306e\u9055\u3044\uff1a\u4f7f\u3044\u5206\u3051\u306e\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">2. interface\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">2.1 interface\u306e\u5ba3\u8a00\uff1a\u69cb\u6587\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">2.2 interface\u306e\u5b9f\u88c5\uff1aimplements\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">3. interface\u3092\u4f7f\u3063\u305f\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">3.1 \u30b7\u30f3\u30d7\u30eb\u306ainterface\u306e\u5b9f\u88c5\u4f8b\uff1a\u8a08\u7b97\u6a5f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-8\">3.2 \u8907\u6570\u306einterface\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\uff1a\u591a\u91cd\u5b9f\u88c5\u306e\u30e1\u30ea\u30c3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-9\">4. Java 8\u4ee5\u964d\u306einterface\u65b0\u6a5f\u80fd\uff1adefault method\u3068static method<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-10\">4.1 default method\u306e\u6d3b\u7528\u6cd5\uff1a\u65e2\u5b58\u306einterface\u3092\u62e1\u5f35\u3059\u308b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">4.2 static method\u306e\u4f7f\u3044\u65b9\uff1a\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u95a2\u6570\u306e\u63d0\u4f9b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">5. interface\u3092\u4f7f\u3063\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\uff1aStrategy pattern\u306e\u5b9f\u88c5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">Strategy pattern\u306e\u6982\u8981\uff1a\u67d4\u8edf\u306a\u632f\u308b\u821e\u3044\u306e\u5207\u308a\u66ff\u3048<\/a>      <\/li>      <li>        <a href=\"#i-14\">interface\u3092\u4f7f\u3063\u305fStrategy pattern\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">Strategy pattern\u306e\u5229\u70b9\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">6. interface\u306e\u5fdc\u7528\uff1a\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u3068\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u306e\u57fa\u672c\u6982\u5ff5\uff1a\u758e\u7d50\u5408\u306e\u5b9f\u73fe<\/a>      <\/li>      <li>        <a href=\"#i-18\">interface\u3092\u6d3b\u7528\u3057\u305f\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">DI\u3068interface\u3092\u4f7f\u7528\u3059\u308b\u5229\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-20\">7. Java interface\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">interface\u306e\u547d\u540d\u898f\u5247\uff1a\u308f\u304b\u308a\u3084\u3059\u3044\u540d\u524d\u306e\u4ed8\u3051\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-22\">interface\u306e\u8a2d\u8a08\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-23\">interface\u306e\u904e\u5270\u4f7f\u7528\u3092\u907f\u3051\u308b\uff1a\u9069\u5207\u306a\u4f7f\u7528\u5834\u9762\u306e\u5224\u65ad<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">Java 8\u4ee5\u964d\u306edefault method \u3068static method \u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-25\">\u307e\u3068\u3081\uff1aJava interface\u30de\u30b9\u30bf\u30fc\u3078\u306e\u9053<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-26\">interface\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e3\u3064\u306e\u30ad\u30fc\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-27\">\u3055\u3089\u306a\u308b\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">1. Java interface\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308b\u57fa\u672c\u6982\u5ff5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-15\">\n<p>Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u3067\u3001interface\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u521d\u5fc3\u8005\u306e\u65b9\u306b\u3082\u7406\u89e3\u3057\u3084\u3059\u3044\u3088\u3046\u306b\u3001\u307e\u305a\u306finterface\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3068\u5f79\u5272\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-16\">\n<h3 class=\"wp-block-heading\" id=\"i-1\">1.1 interface\u306e\u5b9a\u7fa9\u3068\u5f79\u5272\uff1a\u30b3\u30fc\u30c9\u306e\u67d4\u8edf\u6027\u3092\u9ad8\u3081\u308b\u9375<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-17\">\n<p>interface\u306f\u3001\u7c21\u5358\u306b\u8a00\u3048\u3070\u300c\u30e1\u30bd\u30c3\u30c9\u306e\u8a2d\u8a08\u56f3\u300d\u3067\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u306e\u7279\u5fb4<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-18\">\n<li>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u96c6\u5408\u3092\u5b9a\u7fa9\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-19\">\n<li>\u5b9f\u88c5\u3092\u6301\u305f\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u300c\u5951\u7d04\u300d\u3084\u300c\u7d04\u675f\u300d\u3092\u8868\u73fe\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-20\">\n<li>\u5168\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u6697\u9ed9\u7684\u306bpublic\u304b\u3064abstract<\/li>\n<\/div>\n\n\n<li>\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u5b9a\u6570\uff08public static final\uff09\u306e\u307f\u5ba3\u8a00\u53ef\u80fd<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-21\">\n<p>interface\u306e\u5f79\u5272\u306f\u3001\u30b3\u30fc\u30c9\u306e\u67d4\u8edf\u6027\u3068\u518d\u5229\u7528\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u300c\u52d5\u7269\u300d\u3068\u3044\u3046interface\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Animal {\n    void makeSound();\n    void move();\n}<\/pre>\n\n\n<div id=\"sgb-css-id-22\">\n<p>\u3053\u306einterface\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u69d8\u3005\u306a\u52d5\u7269\u30af\u30e9\u30b9\uff08\u72ac\u3001\u732b\u3001\u9ce5\u306a\u3069\uff09\u306b\u5171\u901a\u306e\u632f\u308b\u821e\u3044\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002\u5404\u30af\u30e9\u30b9\u306f\u3001\u3053\u306einterface\u3092\u5b9f\u88c5\uff08implement\uff09\u3059\u308b\u3053\u3068\u3067\u3001\u72ec\u81ea\u306e\u65b9\u6cd5\u3067\u9cf4\u304d\u58f0\u3092\u51fa\u3057\u305f\u308a\u3001\u79fb\u52d5\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-23\">\n<p>interface\u3092\u4f7f\u3046\u3053\u3068\u3067\u5f97\u3089\u308c\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-27\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u306e\u30e1\u30ea\u30c3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\"><div id=\"sgb-css-id-26\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-24\">\n<li>\u758e\u7d50\u5408\u306a\u8a2d\u8a08\uff1a\u30af\u30e9\u30b9\u9593\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u6e1b\u3089\u3057\u3001\u5909\u66f4\u306b\u5f37\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-25\">\n<li>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u6d3b\u7528\uff1a\u7570\u306a\u308b\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5171\u901a\u306einterface\u3067\u6271\u3048\u308b\u3002<\/li>\n<\/div>\n\n\n<li>\u62e1\u5f35\u6027\u306e\u5411\u4e0a\uff1a\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u969b\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u306b\u304f\u3044\u3002<\/li>\n<\/ol>\n<\/div><\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-28\">\n<h3 class=\"wp-block-heading\" id=\"i-2\">1.2 class\u3068interface\u306e\u9055\u3044\uff1a\u4f7f\u3044\u5206\u3051\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-29\">\n<p>class\u3068interface\u306f\u4f3c\u3066\u3044\u308b\u3088\u3046\u3067\u3001\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"id-36dc18e2-f0f6-4998-8f02-46c17823d49f\"><div id=\"sgb-css-id-30\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u7279\u5fb4<\/th><th>class<\/th><th>interface<\/th><\/tr><\/thead><tbody><tr><td>\u5b9f\u88c5<\/td><td>\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u6301\u3064<\/td><td>\u539f\u5247\u3068\u3057\u3066\u5b9f\u88c5\u3092\u6301\u305f\u306a\u3044\uff08Java 8\u4ee5\u964d\u4f8b\u5916\u3042\u308a\uff09<\/td><\/tr><tr><td>\u7d99\u627f<\/td><td>\u5358\u4e00\u7d99\u627f\u306e\u307f\uff08extends\uff09<\/td><td>\u591a\u91cd\u7d99\u627f\u53ef\u80fd\uff08implements\uff09<\/td><\/tr><tr><td>\u30d5\u30a3\u30fc\u30eb\u30c9<\/td><td>\u4efb\u610f\u306e\u5909\u6570\u3092\u5ba3\u8a00\u53ef\u80fd<\/td><td>\u5b9a\u6570\u306e\u307f\u5ba3\u8a00\u53ef\u80fd<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-31\">\n<p>interface\u3092\u4f7f\u3046\u3079\u304d\u4e3b\u306a\u30b1\u30fc\u30b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u3092\u4f7f\u3046\u3079\u304d\u4e3b\u306a\u30b1\u30fc\u30b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-32\">\n<li>\u8907\u6570\u306e\u7121\u95a2\u4fc2\u306a\u30af\u30e9\u30b9\u306b\u5171\u901a\u306e\u632f\u308b\u821e\u3044\u3092\u5b9a\u7fa9\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-33\">\n<li>\u7279\u5b9a\u306e\u6a5f\u80fd\u3084\u632f\u308b\u821e\u3044\u3092\u300c\u4fdd\u8a3c\u300d\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/div>\n\n\n<li>\u5c06\u6765\u7684\u306a\u62e1\u5f35\u6027\u3092\u8003\u616e\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-34\">\n<p>\u4f8b\u3048\u3070\u3001\u300c\u5ea7\u308c\u308b\u300d\u3068\u3044\u3046\u6a5f\u80fd\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8868\u73fe\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306ainterface\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Seatable {\n    void sit();\n    void standUp();\n}<\/pre>\n\n\n<div id=\"sgb-css-id-35\">\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u6905\u5b50\u3001\u30bd\u30d5\u30a1\u30fc\u3001\u30d9\u30f3\u30c1\u306a\u3069\u3001\u7570\u306a\u308b\u30af\u30e9\u30b9\u3067\u3082\u300c\u5ea7\u308b\u300d\u3068\u3044\u3046\u5171\u901a\u306e\u632f\u308b\u821e\u3044\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-36\">\n<p>interface\u306f\u3001Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u9069\u5207\u306b\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u67d4\u8edf\u3067\u62e1\u5f35\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001interface\u306e\u5177\u4f53\u7684\u306a\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-37\">\n<h2 class=\"wp-block-heading\" id=\"i-3\">2. interface\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-38\">\n<p>interface\u306e\u6982\u5ff5\u3092\u7406\u89e3\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u5b9f\u969b\u306b\u3069\u306e\u3088\u3046\u306b\u66f8\u304d\u3001\u5b9f\u88c5\u3059\u308b\u306e\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001interface\u306e\u5ba3\u8a00\u304b\u3089\u5b9f\u88c5\u307e\u3067\u306e\u6d41\u308c\u3092\u3001\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u4ea4\u3048\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-39\">\n<h3 class=\"wp-block-heading\" id=\"i-4\">2.1 interface\u306e\u5ba3\u8a00\uff1a\u69cb\u6587\u3068\u6ce8\u610f\u70b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-40\">\n<p>interface\u3092\u5ba3\u8a00\u3059\u308b\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface InterfaceName {\n    \/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\n    returnType methodName(parameters);\n\n    \/\/ \u5b9a\u6570\u306e\u5ba3\u8a00\uff08\u5fc5\u8981\u306a\u5834\u5408\uff09\n    public static final dataType CONSTANT_NAME = value;\n}<\/pre>\n\n\n<div id=\"sgb-css-id-41\">\n<p>interface\u3092\u5ba3\u8a00\u3059\u308b\u969b\u306e\u4e3b\u306a\u6ce8\u610f\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-45\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#ffb36b;color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u5ba3\u8a00\u306e\u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#ffb36b;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-42\">\n<li><code>interface<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-43\">\n<li>\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306f\u901a\u5e38<code>public<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3002\uff08\u7701\u7565\u3059\u308b\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30a2\u30af\u30bb\u30b9\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-44\">\n<li>\u30e1\u30bd\u30c3\u30c9\u306f\u81ea\u52d5\u7684\u306b<code>public abstract<\/code>\u3068\u306a\u308b\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u4fee\u98fe\u5b50\u306f\u7701\u7565\u53ef\u80fd\u3002<\/li>\n<\/div>\n\n\n<li>\u5b9a\u6570\u306f\u81ea\u52d5\u7684\u306b<code>public static final<\/code>\u3068\u306a\u308b\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u4fee\u98fe\u5b50\u306f\u7701\u7565\u53ef\u80fd\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-46\">\n<p>interface\u306e\u547d\u540d\u306b\u306f\u3001\u5f62\u5bb9\u8a5e\u7684\u306a\u540d\u524d\uff08\u4f8b\uff1aRunnable, Comparable\uff09\u3092\u4f7f\u3046\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u307e\u305f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u52d5\u8a5e\u307e\u305f\u306f\u52d5\u8a5e\u53e5\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-47\">\n<h3 class=\"wp-block-heading\" id=\"i-5\">2.2 interface\u306e\u5b9f\u88c5\uff1aimplements\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-48\">\n<p>interface\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001<code>implements<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ClassName implements InterfaceName {\n    \/\/ interface\u3067\u5ba3\u8a00\u3055\u308c\u305f\u5168\u3066\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\n    @Override\n    public returnType methodName(parameters) {\n        \/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u5177\u4f53\u7684\u306a\u5b9f\u88c5\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-49\">\n<p>\u4ee5\u4e0b\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306ainterface\u3068\u305d\u308c\u3092\u5b9f\u88c5\u3059\u308b\u30af\u30e9\u30b9\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5ba3\u8a00\npublic interface Drawable {\n    void draw();\n}\n\n\/\/ \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\npublic class Circle implements Drawable {\n    @Override\n    public void draw() {\n        System.out.println(\"\u5186\u3092\u63cf\u753b\u3057\u307e\u3059\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-50\">\n<p>\u8907\u6570\u306einterface\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3092\u300c\u591a\u91cd\u5b9f\u88c5\u300d\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Colorable {\n    void setColor(String color);\n}\n\npublic class ColorfulCircle implements Drawable, Colorable {\n    private String color;\n\n    @Override\n    public void draw() {\n        System.out.println(color + \"\u8272\u306e\u5186\u3092\u63cf\u753b\u3057\u307e\u3059\");\n    }\n\n    @Override\n    public void setColor(String color) {\n        this.color = color;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-51\">\n<p>\u591a\u91cd\u5b9f\u88c5\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30b9\u306b\u8907\u6570\u306e\u6a5f\u80fd\u3092\u67d4\u8edf\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-52\">\n<p>interface\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306e\u4e3b\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-55\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">interface \u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-53\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u306b\u5f93\u3044\u3001interface\u3092\u9069\u5207\u306b\u5206\u5272\u3059\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-54\">\n<li>\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u306f\u3001\u5168\u3066\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5fc5\u305a\u5b9f\u88c5\u3059\u308b\u3002<\/li>\n<\/div>\n\n\n<li><code>@Override<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3092\u660e\u793a\u3059\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-56\">\n<p>\u306a\u304a\u3001Java 8\u4ee5\u964d\u3067\u306f\u3001interface\u306bdefault method\u3068static method\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001interface\u306e\u6a5f\u80fd\u304c\u3055\u3089\u306b\u62e1\u5f35\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-57\">\n<p>\u4ee5\u4e0a\u304c\u3001interface\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u65b9\u6cd5\u3067\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u901a\u3058\u3066\u3001interface\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-58\">\n<h2 class=\"wp-block-heading\" id=\"i-6\">3. interface\u3092\u4f7f\u3063\u305f\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u89e3\u8aac<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-59\">\n<p>\u3053\u3053\u3067\u306f\u3001interface\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u901a\u3058\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u307e\u305a\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u8a08\u7b97\u6a5f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4f8b\u304b\u3089\u59cb\u3081\u3001\u305d\u306e\u5f8c\u3001\u8907\u6570\u306einterface\u3092\u5b9f\u88c5\u3059\u308b\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-60\">\n<h3 class=\"wp-block-heading\" id=\"i-7\">3.1 \u30b7\u30f3\u30d7\u30eb\u306ainterface\u306e\u5b9f\u88c5\u4f8b\uff1a\u8a08\u7b97\u6a5f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-61\">\n<p>\u307e\u305a\u3001\u57fa\u672c\u7684\u306a\u7b97\u8853\u6f14\u7b97\u3092\u5b9a\u7fa9\u3057\u305f\u8a08\u7b97\u6a5f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Calculator {\n    double add(double a, double b);\n    double subtract(double a, double b);\n    double multiply(double a, double b);\n    double divide(double a, double b);\n}<\/pre>\n\n\n<div id=\"sgb-css-id-62\">\n<p>\u6b21\u306b\u3001\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u57fa\u672c\u7684\u306a\u96fb\u5353\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BasicCalculator implements Calculator {\n    @Override\n    public double add(double a, double b) {\n        return a + b;\n    }\n\n    @Override\n    public double subtract(double a, double b) {\n        return a - b;\n    }\n\n    @Override\n    public double multiply(double a, double b) {\n        return a * b;\n    }\n\n    @Override\n    public double divide(double a, double b) {\n        if (b == 0) {\n            throw new ArithmeticException(\"\u9664\u7b97\u306e\u5206\u6bcd\u306b0\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\");\n        }\n        return a \/ b;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-63\">\n<p>\u3053\u306e\u57fa\u672c\u7684\u306a\u5b9f\u88c5\u306b\u52a0\u3048\u3066\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u6f14\u7b97\u3092\u884c\u3046\u79d1\u5b66\u8a08\u7b97\u6a5f\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u307e\u305a\u3001\u8ffd\u52a0\u306e\u6f14\u7b97\u3092\u5b9a\u7fa9\u3059\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface AdvancedCalculator {\n    double sqrt(double a);\n    double power(double base, double exponent);\n}<\/pre>\n\n\n<div id=\"sgb-css-id-64\">\n<p>\u305d\u3057\u3066\u3001<code>Calculator<\/code>\u3068<code>AdvancedCalculator<\/code>\u306e\u4e21\u65b9\u3092\u5b9f\u88c5\u3059\u308b<code>ScientificCalculator<\/code>\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ScientificCalculator implements Calculator, AdvancedCalculator {\n    \/\/ Calculator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\n    \/\/ (BasicCalculator\u3068\u540c\u3058\u5b9f\u88c5\u306a\u306e\u3067\u7701\u7565)\n\n    @Override\n    public double sqrt(double a) {\n        if (a &lt; 0) {\n            throw new IllegalArgumentException(\"\u8ca0\u306e\u6570\u306e\u5e73\u65b9\u6839\u306f\u5b9f\u6570\u3067\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\");\n        }\n        return Math.sqrt(a);\n    }\n\n    @Override\n    public double power(double base, double exponent) {\n        return Math.pow(base, exponent);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-65\">\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001<code>ScientificCalculator<\/code>\u304c\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u57fa\u672c\u7684\u306a\u8a08\u7b97\u6a5f\u80fd\u3068\u9ad8\u5ea6\u306a\u8a08\u7b97\u6a5f\u80fd\u306e\u4e21\u65b9\u3092\u6301\u3064\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-66\">\n<h3 class=\"wp-block-heading\" id=\"i-8\">3.2 \u8907\u6570\u306einterface\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\uff1a\u591a\u91cd\u5b9f\u88c5\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-67\">\n<p>\u6b21\u306b\u3001Java\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3042\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u3053\u3067\u306f\u3001<code>Comparable<\/code>\u3068<code>Cloneable<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u540c\u6642\u306b\u5b9f\u88c5\u3059\u308b<code>Person<\/code>\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Person implements Comparable&lt;Person&gt;, Cloneable {\n    private String name;\n    private int age;\n\n    public Person(String name, int age) {\n        this.name = name;\n        this.age = age;\n    }\n\n    @Override\n    public int compareTo(Person other) {\n        return this.age - other.age;\n    }\n\n    @Override\n    public Object clone() throws CloneNotSupportedException {\n        return super.clone();\n    }\n\n    @Override\n    public String toString() {\n        return \"Person{name='\" + name + \"', age=\" + age + \"}\";\n    }\n\n    \/\/ getter\u3068setter\u306f\u7701\u7565\n}<\/pre>\n\n\n<div id=\"sgb-css-id-68\">\n<p>\u3053\u306e<code>Person<\/code>\u30af\u30e9\u30b9\u306f\u4ee5\u4e0b\u306e\u7279\u5fb4\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<ol class=\"wp-block-list is-style-sango-list-simple\"><div id=\"sgb-css-id-69\">\n<li><code>Comparable<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u306b\u3088\u308a\u3001<code>Person<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5e74\u9f62\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-70\">\n<li><code>Cloneable<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u306b\u3088\u308a\u3001<code>Person<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8907\u88fd\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/div><\/ol>\n\n\n<div id=\"sgb-css-id-71\">\n<p>\u3053\u308c\u3089\u306e\u4f8b\u304b\u3089\u3001interface\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u5f97\u3089\u308c\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-74\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u4f7f\u7528\u306e\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-72\">\n<li>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\uff1ainterface\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u5171\u901a\u306e\u632f\u308b\u821e\u3044\u3092\u6301\u3064\u7570\u306a\u308b\u30af\u30e9\u30b9\u9593\u3067\u30b3\u30fc\u30c9\u3092\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-73\">\n<li>\u62e1\u5f35\u6027\u3068\u67d4\u8edf\u6027\uff1a\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u8ffd\u52a0\u3059\u308b\u969b\u306b\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u305b\u305a\u306b\u65b0\u3057\u3044interface\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/div>\n\n\n<li>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u6d3b\u7528\uff1a\u7570\u306a\u308b\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5171\u901a\u306einterface\u3067\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-75\">\n<p>\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3068\u3057\u3066\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3084\u30ed\u30ae\u30f3\u30b0\u306a\u3069\u306e\u64cd\u4f5c\u3092\u62bd\u8c61\u5316\u3059\u308binterface\u304c\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface DatabaseConnection {\n    void connect(String url, String username, String password);\n    void disconnect();\n    ResultSet executeQuery(String query);\n    int executeUpdate(String query);\n}\n\npublic interface Logger {\n    void log(String message);\n    void logError(String message, Exception e);\n}<\/pre>\n\n\n<div id=\"sgb-css-id-76\">\n<p>\u3053\u308c\u3089\u306einterface\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u306e\u8a73\u7d30\u3092\u96a0\u853d\u3057\u3001\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u3084\u62e1\u5f35\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-77\">\n<p>\u307e\u305f\u3001\u591a\u304f\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3084\u30e9\u30a4\u30d6\u30e9\u30ea\u3001\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3067\u3082interface\u304c\u6d3b\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001Spring Framework\u306eJDBCTemplate\u3084\u3001Strategy \u30d1\u30bf\u30fc\u30f3\u306a\u3069\u304c\u305d\u306e\u4ee3\u8868\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-78\">\n<p>interface\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u67d4\u8edf\u3067\u62e1\u5f35\u6027\u306e\u9ad8\u3044\u3001\u305d\u3057\u3066\u30c6\u30b9\u30c8\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Java 8\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305finterface\u306e\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-79\">\n<h2 class=\"wp-block-heading\" id=\"i-9\">4. Java 8\u4ee5\u964d\u306einterface\u65b0\u6a5f\u80fd\uff1adefault method\u3068static method<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-80\">\n<p>Java 8\u3067\u5c0e\u5165\u3055\u308c\u305finterface\u65b0\u6a5f\u80fd\u306f\u3001Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u5927\u304d\u306a\u5909\u9769\u3092\u3082\u305f\u3089\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u7ae0\u3067\u306f\u3001default method\u3068static method\u3068\u3044\u30462\u3064\u306e\u91cd\u8981\u306a\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-81\">\n<h3 class=\"wp-block-heading\" id=\"i-10\">4.1 default method\u306e\u6d3b\u7528\u6cd5\uff1a\u65e2\u5b58\u306einterface\u3092\u62e1\u5f35\u3059\u308b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-82\">\n<p>default method\u306f\u3001interface\u306b\u76f4\u63a5\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u6a5f\u80fd\u3067\u3059\u3002\u3053\u306e\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u305f\u4e3b\u306a\u7406\u7531\u306f\u3001\u65e2\u5b58\u306einterface\u306b\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u969b\u306e\u5f8c\u65b9\u4e92\u63db\u6027\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>default method<\/code> \u306e\u7279\u5fb4\uff1a<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-83\">\n<li><code>default<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-84\">\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5185\u3067\u5b9f\u88c5\u3092\u63d0\u4f9b<\/li>\n<\/div>\n\n\n<li>\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u53ef\u80fd<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-85\">\n<p>default method\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface MyInterface {\n    default void newMethod() {\n        System.out.println(\"This is a default method\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-86\">\n<p>\u5177\u4f53\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u3057\u3066\u3001Java 8\u3067<code>Iterable<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u8ffd\u52a0\u3055\u308c\u305f<code>forEach<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Iterable&lt;T&gt; {\n    default void forEach(Consumer&lt;? super T&gt; action) {\n        Objects.requireNonNull(action);\n        for (T t : this) {\n            action.accept(t);\n        }\n    }\n    \/\/ \u4ed6\u306e\u30e1\u30bd\u30c3\u30c9...\n}<\/pre>\n\n\n<div id=\"sgb-css-id-87\">\n<p>\u3053\u306e<code>forEach<\/code>\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308a\u3001\u65e2\u5b58\u306e<code>Iterable<\/code>\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">List&lt;String&gt; names = Arrays.asList(\"Alice\", \"Bob\", \"Charlie\");\nnames.forEach(name -&gt; System.out.println(\"Hello, \" + name));<\/pre>\n\n\n<div id=\"sgb-css-id-88\">\n<p>default method\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304b\u3089default method\u3092\u7d99\u627f\u3057\u305f\u5834\u5408\u306e\u89e3\u6c7a\u898f\u5247\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u660e\u793a\u7684\u306b\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-89\">\n<h3 class=\"wp-block-heading\" id=\"i-11\">4.2 static method\u306e\u4f7f\u3044\u65b9\uff1a\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u95a2\u6570\u306e\u63d0\u4f9b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-90\">\n<p>static method\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5185\u3067\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3067\u304d\u308b\u6a5f\u80fd\u3067\u3059\u3002\u3053\u306e\u6a5f\u80fd\u306b\u3088\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u95a2\u9023\u3059\u308b\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u3092\u76f4\u63a5\u63d0\u4f9b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">static method\u306e\u7279\u5fb4\uff1a<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-91\">\n<li><code>static<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-92\">\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d\u3092\u901a\u3058\u3066\u76f4\u63a5\u547c\u3073\u51fa\u3057\u53ef\u80fd<\/li>\n<\/div>\n\n\n<li>\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u306f\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-93\">\n<p>static method\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface MyInterface {\n    static void staticMethod() {\n        System.out.println(\"This is a static method\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-94\">\n<p>\u5177\u4f53\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u3057\u3066\u3001<code>Comparator<\/code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e<code>comparing<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface Comparator&lt;T&gt; {\n    static &lt;U extends Comparable&lt;? super U&gt;&gt; Comparator&lt;T&gt; comparing(\n            Function&lt;? super T, ? extends U&gt; keyExtractor) {\n        Objects.requireNonNull(keyExtractor);\n        return (Comparator&lt;T&gt; &amp; Serializable)\n            (c1, c2) -&gt; keyExtractor.apply(c1).compareTo(keyExtractor.apply(c2));\n    }\n    \/\/ \u4ed6\u306e\u30e1\u30bd\u30c3\u30c9...\n}<\/pre>\n\n\n<div id=\"sgb-css-id-95\">\n<p>\u3053\u306estatic method\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u3092\u3088\u308a\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">List&lt;Person&gt; people = Arrays.asList(\n    new Person(\"Alice\", 30),\n    new Person(\"Bob\", 25),\n    new Person(\"Charlie\", 35)\n);\n\npeople.sort(Comparator.comparing(Person::getAge));<\/pre>\n\n\n<div id=\"sgb-css-id-96\">\n<p>\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u304c\u3082\u305f\u3089\u3059\u4e3b\u306a\u5229\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#009EF3;color:#FFF\" class=\"sgb-box-simple__title\">\u5229\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#009EF3;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-97\">\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u9032\u5316\u304c\u5bb9\u6613\u306b\u306a\u308b\uff1a\u65e2\u5b58\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u3082\u3001\u305d\u308c\u3092\u5b9f\u88c5\u3059\u308b\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-98\">\n<li>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u306e\u96c6\u7d04\uff1a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u95a2\u9023\u3059\u308b\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u3092\u3001\u5225\u306e\u30af\u30e9\u30b9\u3067\u306f\u306a\u304f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u81ea\u4f53\u306b\u5b9a\u7fa9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/li>\n<\/div>\n\n\n<li>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306e\u89aa\u548c\u6027\uff1aJava 8\u3067\u5c0e\u5165\u3055\u308c\u305f\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u3068\u76f8\u6027\u304c\u826f\u304f\u3001\u3088\u308a\u8868\u73fe\u529b\u8c4a\u304b\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-99\">\n<p>\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u306f\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#ffb36b;color:#FFF\" class=\"sgb-box-simple__title\">\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#ffb36b;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-100\">\n<li>\u591a\u91cd\u7d99\u627f\u306e\u8907\u96d1\u3055\uff1a\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304b\u3089\u77db\u76fe\u3059\u308bdefault method\u3092\u7d99\u627f\u3057\u305f\u5834\u5408\u3001\u89e3\u6c7a\u65b9\u6cd5\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-101\">\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5b9f\u88c5\u3078\u306e\u904e\u5ea6\u306e\u4f9d\u5b58\uff1adefault method\u306f\u3042\u304f\u307e\u3067\u3082\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5b9f\u88c5\u3067\u3042\u308a\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5404\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3053\u3068\u304c\u671b\u307e\u3057\u3044\u3002<\/li>\n<\/div>\n\n\n<li>\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eJava\u3068\u306e\u4e92\u63db\u6027\uff1aJava 8\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30af\u30e9\u30b9\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u3092\u5229\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-102\">\n<p>\u5f93\u6765\u306einterface\u3068\u306e\u6700\u5927\u306e\u9055\u3044\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u81ea\u4f53\u306b\u542b\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3053\u3068\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c\u7684\u306a\u6027\u8cea\uff08\u591a\u91cd\u5b9f\u88c5\u304c\u53ef\u80fd\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u5b9a\u6570\u306e\u307f\uff09\u306f\u5909\u308f\u3063\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u3078\u306e\u5f71\u97ff\u306f\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-103\">\n<p>\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u306b\u3088\u308a\u3001interface\u306f\u3088\u308a\u67d4\u8edf\u3067\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3068\u306a\u308a\u307e\u3057\u305f\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u3092\u6d3b\u7528\u3057\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-104\">\n<h2 class=\"wp-block-heading\" id=\"i-12\">5. interface\u3092\u4f7f\u3063\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\uff1aStrategy pattern\u306e\u5b9f\u88c5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-105\">\n<p>\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u306b\u304a\u3051\u308b\u5171\u901a\u306e\u554f\u984c\u306b\u5bfe\u3059\u308b\u518d\u5229\u7528\u53ef\u80fd\u306a\u89e3\u6c7a\u7b56\u3067\u3059\u3002\u305d\u306e\u4e2d\u3067\u3082Strategy pattern\uff08\u6226\u7565\u30d1\u30bf\u30fc\u30f3\uff09\u306f\u3001interface\u3092\u6d3b\u7528\u3057\u305f\u4ee3\u8868\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Strategy pattern\u306e\u6982\u8981\u3068\u3001Java\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-106\">\n<h3 class=\"wp-block-heading\" id=\"i-13\">Strategy pattern\u306e\u6982\u8981\uff1a\u67d4\u8edf\u306a\u632f\u308b\u821e\u3044\u306e\u5207\u308a\u66ff\u3048<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-107\">\n<p>Strategy pattern\u306f\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u30d5\u30a1\u30df\u30ea\u30fc\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u308c\u305e\u308c\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u3066\u4ea4\u63db\u53ef\u80fd\u306b\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5b9f\u884c\u6642\u306b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u9078\u629e\u3057\u3001\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-108\">\n<p>Strategy pattern\u306f\u4ee5\u4e0b\u306e\u8981\u7d20\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">Strategy pattern \u306e\u8981\u7d20<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-109\">\n<li>Strategy\uff08\u6226\u7565\uff09\uff1a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-110\">\n<li>ConcreteStrategy\uff08\u5177\u4f53\u7684\u6226\u7565\uff09\uff1aStrategy\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5<\/li>\n<\/div>\n\n\n<li>Context\uff08\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\uff09\uff1aStrategy\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-111\">\n<h3 class=\"wp-block-heading\" id=\"i-14\">interface\u3092\u4f7f\u3063\u305fStrategy pattern\u306e\u5b9f\u88c5\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-112\">\n<p>\u5b9f\u969b\u306e\u4f8b\u3068\u3057\u3066\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3051\u308b\u652f\u6255\u3044\u51e6\u7406\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u7570\u306a\u308b\u652f\u6255\u3044\u65b9\u6cd5\uff08\u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u3001PayPal\u3001\u9280\u884c\u632f\u8fbc\u306a\u3069\uff09\u3092\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-113\">\n<p>\u307e\u305a\u3001\u652f\u6255\u65b9\u6cd5\u306eStrategy\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface PaymentStrategy {\n    void pay(int amount);\n}<\/pre>\n\n\n<div id=\"sgb-css-id-114\">\n<p>\u6b21\u306b\u3001\u5177\u4f53\u7684\u306a\u652f\u6255\u65b9\u6cd5\u30af\u30e9\u30b9\uff08ConcreteStrategy\uff09\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CreditCardPayment implements PaymentStrategy {\n    private String name;\n    private String cardNumber;\n\n    public CreditCardPayment(String name, String cardNumber) {\n        this.name = name;\n        this.cardNumber = cardNumber;\n    }\n\n    @Override\n    public void pay(int amount) {\n        System.out.println(amount + \"\u5186\u3092\u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u3067\u652f\u6255\u3044\u307e\u3057\u305f\u3002\");\n    }\n}\n\npublic class PayPalPayment implements PaymentStrategy {\n    private String email;\n\n    public PayPalPayment(String email) {\n        this.email = email;\n    }\n\n    @Override\n    public void pay(int amount) {\n        System.out.println(amount + \"\u5186\u3092PayPal\u3067\u652f\u6255\u3044\u307e\u3057\u305f\u3002\");\n    }\n}\n\npublic class BankTransferPayment implements PaymentStrategy {\n    private String bankAccount;\n\n    public BankTransferPayment(String bankAccount) {\n        this.bankAccount = bankAccount;\n    }\n\n    @Override\n    public void pay(int amount) {\n        System.out.println(amount + \"\u5186\u3092\u9280\u884c\u632f\u8fbc\u3067\u652f\u6255\u3044\u307e\u3057\u305f\u3002\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-115\">\n<p>\u6700\u5f8c\u306b\u3001\u652f\u6255\u51e6\u7406\u3092\u884c\u3046Context\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ShoppingCart {\n    private PaymentStrategy paymentStrategy;\n\n    public void setPaymentStrategy(PaymentStrategy paymentStrategy) {\n        this.paymentStrategy = paymentStrategy;\n    }\n\n    public void checkout(int amount) {\n        paymentStrategy.pay(amount);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-116\">\n<p>\u4ee5\u4e0b\u306f\u3001\u3053\u306eStrategy pattern\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Main {\n    public static void main(String[] args) {\n        ShoppingCart cart = new ShoppingCart();\n\n        \/\/ \u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u3067\u306e\u652f\u6255\u3044\n        cart.setPaymentStrategy(new CreditCardPayment(\"John Doe\", \"1234-5678-9012-3456\"));\n        cart.checkout(10000);\n\n        \/\/ PayPal\u3067\u306e\u652f\u6255\u3044\n        cart.setPaymentStrategy(new PayPalPayment(\"john.doe@example.com\"));\n        cart.checkout(5000);\n\n        \/\/ \u9280\u884c\u632f\u8fbc\u3067\u306e\u652f\u6255\u3044\n        cart.setPaymentStrategy(new BankTransferPayment(\"JP12345678\"));\n        cart.checkout(15000);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">Strategy pattern\u306e\u5229\u70b9\u3068\u6ce8\u610f\u70b9<\/h3>\n\n\n<div id=\"sgb-css-id-119\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#009EF3;color:#FFF\" class=\"sgb-box-simple__title\">\u5229\u70b9\uff1a<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#009EF3;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-117\">\n<li>\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5207\u308a\u66ff\u3048\u304c\u5bb9\u6613\uff1a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u305b\u305a\u306b\u3001\u7570\u306a\u308b\u6226\u7565\u3092\u4f7f\u7528\u3067\u304d\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-118\">\n<li>\u65b0\u3057\u3044\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u8ffd\u52a0\u304c\u7c21\u5358\uff1a\u65b0\u3057\u3044\u652f\u6255\u65b9\u6cd5\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u305b\u305a\u306b\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067\u3042\u308b\u3002<\/li>\n<\/div>\n\n\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3068\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5206\u96e2\uff1aShoppingCart\u30af\u30e9\u30b9\u306f\u5177\u4f53\u7684\u306a\u652f\u6255\u65b9\u6cd5\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#ffb36b;color:#FFF\" class=\"sgb-box-simple__title\">\u6ce8\u610f\u70b9\uff1a<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#ffb36b;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-120\">\n<li>\u6226\u7565\u306e\u6570\u304c\u591a\u304f\u306a\u308b\u3068\u3001\u30af\u30e9\u30b9\u306e\u6570\u3082\u5897\u3048\u308b\u305f\u3081\u3001\u7ba1\u7406\u304c\u8907\u96d1\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/div>\n\n\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u9069\u5207\u306a\u6226\u7565\u3092\u9078\u629e\u3059\u308b\u305f\u3081\u306b\u3001\u5404\u6226\u7565\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-121\">\n<p>Strategy pattern\u306f\u3001interface\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u67d4\u8edf\u6027\u306e\u9ad8\u3044\u8a2d\u8a08\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5909\u66f4\u306b\u5f37\u304f\u3001\u62e1\u5f35\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001interface\u306e\u5fdc\u7528\u3068\u3057\u3066\u3001\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u3068\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-122\">\n<h2 class=\"wp-block-heading\" id=\"i-16\">6. interface\u306e\u5fdc\u7528\uff1a\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u3068\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-123\">\n<p>interface\u306e\u91cd\u8981\u306a\u5fdc\u7528\u4f8b\u3068\u3057\u3066\u3001\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\uff08Dependency Injection\u3001DI\uff09\u304c\u3042\u308a\u307e\u3059\u3002DI\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u758e\u7d50\u5408\u6027\u3092\u9ad8\u3081\u3001\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001DI\u306e\u57fa\u672c\u6982\u5ff5\u3068\u3001interface\u3092\u4f7f\u3063\u305fDI\u306e\u5b9f\u88c5\u65b9\u6cd5\u3001\u305d\u3057\u3066\u305d\u308c\u304c\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306b\u3082\u305f\u3089\u3059\u5229\u70b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-124\">\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u306e\u57fa\u672c\u6982\u5ff5\uff1a\u758e\u7d50\u5408\u306e\u5b9f\u73fe<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-125\">\n<p>\u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u3068\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u5916\u90e8\u304b\u3089\u6ce8\u5165\u3059\u308b\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306e\u7d50\u5408\u5ea6\u3092\u4f4e\u304f\u4fdd\u3061\u3001\u67d4\u8edf\u6027\u3068\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-126\">\n<p>interface\u3092\u4f7f\u7528\u3057\u305fDI\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface MessageService {\n    String getMessage();\n}\n\npublic class EmailService implements MessageService {\n    @Override\n    public String getMessage() {\n        return \"This is an email message.\";\n    }\n}\n\npublic class SMSService implements MessageService {\n    @Override\n    public String getMessage() {\n        return \"This is an SMS message.\";\n    }\n}\n\npublic class NotificationService {\n    private MessageService messageService;\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\n    public NotificationService(MessageService messageService) {\n        this.messageService = messageService;\n    }\n\n    public void sendNotification() {\n        System.out.println(messageService.getMessage());\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-127\">\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001<code>NotificationService<\/code>\u306f\u5177\u4f53\u7684\u306a<code>MessageService<\/code>\u306e\u5b9f\u88c5\u306b\u4f9d\u5b58\u305b\u305a\u3001interface\u306b\u4f9d\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7570\u306a\u308b\u7a2e\u985e\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u30b5\u30fc\u30d3\u30b9\u3092\u7c21\u5358\u306b\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-128\">\n<h3 class=\"wp-block-heading\" id=\"i-18\">interface\u3092\u6d3b\u7528\u3057\u305f\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-129\">\n<p>DI\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u304c\u683c\u6bb5\u306b\u66f8\u304d\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u30e2\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30af\u30e9\u30b9\u3092\u4ed6\u306e\u4f9d\u5b58\u95a2\u4fc2\u304b\u3089\u5206\u96e2\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-130\">\n<p>JUnit\u3068Mockito\u3092\u4f7f\u7528\u3057\u305f\u30c6\u30b9\u30c8\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import org.junit.jupiter.api.Test;\nimport org.mockito.Mockito;\nimport static org.mockito.Mockito.*;\n\npublic class NotificationServiceTest {\n\n    @Test\n    public void testSendNotification() {\n        \/\/ \u30e2\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\n        MessageService mockMessageService = mock(MessageService.class);\n        when(mockMessageService.getMessage()).thenReturn(\"Test message\");\n\n        \/\/ \u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u30e2\u30c3\u30af\u3092\u6ce8\u5165\n        NotificationService notificationService = new NotificationService(mockMessageService);\n\n        \/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\n        notificationService.sendNotification();\n\n        \/\/ \u30e2\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\n        verify(mockMessageService).getMessage();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-131\">\n<p>\u3053\u306e\u30c6\u30b9\u30c8\u3067\u306f\u3001<code>MessageService<\/code>\u306e\u30e2\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001<code>NotificationService<\/code>\u306b\u6ce8\u5165\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b9f\u969b\u306e<code>EmailService<\/code>\u3084<code>SMSService<\/code>\u3092\u4f7f\u7528\u305b\u305a\u306b\u30c6\u30b9\u30c8\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-132\">\n<h3 class=\"wp-block-heading\" id=\"i-19\">DI\u3068interface\u3092\u4f7f\u7528\u3059\u308b\u5229\u70b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-136\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#009EF3;color:#FFF\" class=\"sgb-box-simple__title\">\u5229\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#009EF3;background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-133\">\n<li>\u758e\u7d50\u5408\uff1a\u30af\u30e9\u30b9\u9593\u306e\u4f9d\u5b58\u95a2\u4fc2\u304c\u6e1b\u5c11\u3057\u3001\u5909\u66f4\u306e\u5f71\u97ff\u7bc4\u56f2\u304c\u5c0f\u3055\u304f\u306a\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-134\">\n<li>\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\uff1a\u30e2\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u5358\u4f53\u30c6\u30b9\u30c8\u304c\u5bb9\u6613\u306b\u306a\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-135\">\n<li>\u67d4\u8edf\u6027\uff1a\u5b9f\u88c5\u306e\u5909\u66f4\u3084\u65b0\u3057\u3044\u5b9f\u88c5\u306e\u8ffd\u52a0\u304c\u5bb9\u6613\u306b\u306a\u308b\u3002<\/li>\n<\/div>\n\n\n<li>\u95a2\u5fc3\u306e\u5206\u96e2\uff1a\u5404\u30af\u30e9\u30b9\u304c\u7279\u5b9a\u306e\u8cac\u4efb\u306b\u96c6\u4e2d\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-137\">\n<p>interface\u3092\u6d3b\u7528\u3057\u305fDI\u306f\u3001\u5927\u898f\u6a21\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306b\u304a\u3044\u3066\u7279\u306b\u6709\u52b9\u3067\u3059\u3002\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u3068\u62e1\u5f35\u6027\u304c\u5411\u4e0a\u3057\u3001\u9577\u671f\u7684\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u6210\u529f\u306b\u8ca2\u732e\u3057\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Java\u306einterface\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-138\">\n<h2 class=\"wp-block-heading\" id=\"i-20\">7. Java interface\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-139\">\n<p>interface\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Java interface\u306e\u547d\u540d\u898f\u5247\u3001\u8a2d\u8a08\u306e\u6307\u91dd\u3001\u305d\u3057\u3066\u904e\u5270\u4f7f\u7528\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-140\">\n<h3 class=\"wp-block-heading\" id=\"i-21\">interface\u306e\u547d\u540d\u898f\u5247\uff1a\u308f\u304b\u308a\u3084\u3059\u3044\u540d\u524d\u306e\u4ed8\u3051\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-141\">\n<p>\u9069\u5207\u306a\u547d\u540d\u306f\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u7406\u89e3\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002interface\u306e\u547d\u540d\u306b\u306f\u4ee5\u4e0b\u306e\u898f\u5247\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-144\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">interface \u306e\u547d\u540d\u898f\u5247<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-142\">\n<li>\u5f62\u5bb9\u8a5e\u7684\u306a\u540d\u524d\u3092\u4f7f\u7528\u3059\u308b\uff1a\u4f8b\uff09Comparable, Runnable<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-143\">\n<li>\u6a5f\u80fd\u3092\u8868\u3059\u540d\u8a5e\u3092\u4f7f\u7528\u3059\u308b\uff1a\u4f8b\uff09List, Map<\/li>\n<\/div>\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u63a5\u5c3e\u8f9e\u201d-able\u201d\u3084\u201d-ible\u201d\u3092\u4f7f\u7528\u3059\u308b\uff1a\u4f8b\uff09Serializable, Accessible<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-145\">\n<h3 class=\"wp-block-heading\" id=\"i-22\">interface\u306e\u8a2d\u8a08\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-149\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">interface\u306e\u8a2d\u8a08\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-146\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u3092\u5b88\u308b\uff1a1\u3064\u306einterface\u306f1\u3064\u306e\u660e\u78ba\u306a\u76ee\u7684\u3092\u6301\u3064\u3079\u304d\u3067\u3042\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-147\">\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u6570\u3092\u5fc5\u8981\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\uff1a\u591a\u3059\u304e\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u5b9f\u88c5\u3092\u96e3\u3057\u304f\u3059\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-148\">\n<li>\u95a2\u9023\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\uff1a\u6a5f\u80fd\u7684\u306b\u95a2\u9023\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u306einterface\u306b\u307e\u3068\u3081\u308b\u3002<\/li>\n<\/div>\n\n\n<li>\u7d99\u627f\u968e\u5c64\u3092\u6d45\u304f\u4fdd\u3064\uff1a\u6df1\u3044\u7d99\u627f\u968e\u5c64\u306f\u8907\u96d1\u6027\u3092\u5897\u52a0\u3055\u305b\u308b\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-150\">\n<h3 class=\"wp-block-heading\" id=\"i-23\">interface\u306e\u904e\u5270\u4f7f\u7528\u3092\u907f\u3051\u308b\uff1a\u9069\u5207\u306a\u4f7f\u7528\u5834\u9762\u306e\u5224\u65ad<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-151\">\n<p>interface\u306f\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u304c\u3001\u904e\u5270\u306b\u4f7f\u7528\u3059\u308b\u3068\u30b3\u30fc\u30c9\u3092\u8907\u96d1\u306b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-152\">\n<li>\u5b9f\u88c5\u30af\u30e9\u30b9\u304c1\u3064\u3057\u304b\u306a\u3044\u5834\u5408\u306f\u3001interface\u306f\u4e0d\u8981\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/li>\n<\/div>\n\n\n<li>\u5c06\u6765\u306e\u62e1\u5f35\u6027\u304c\u660e\u78ba\u3067\u306a\u3044\u5834\u5408\u306f\u3001interface\u306e\u5c0e\u5165\u3092\u614e\u91cd\u306b\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<div id=\"sgb-css-id-153\">\n<p>\u9069\u5207\u306a\u4f7f\u7528\u4f8b\uff1a<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public interface PaymentProcessor {\n    void processPayment(double amount);\n}\n\npublic class CreditCardProcessor implements PaymentProcessor {\n    @Override\n    public void processPayment(double amount) {\n        \/\/ \u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u6c7a\u6e08\u306e\u51e6\u7406\n    }\n}\n\npublic class PayPalProcessor implements PaymentProcessor {\n    @Override\n    public void processPayment(double amount) {\n        \/\/ PayPal\u6c7a\u6e08\u306e\u51e6\u7406\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-154\">\n<p>\u4e0d\u9069\u5207\u306a\u4f7f\u7528\u4f8b\uff1a<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u904e\u5270\u306b\u7d30\u5206\u5316\u3055\u308c\u305finterface\npublic interface Logger {\n    void log(String message);\n}\n\n\/\/ \u5358\u4e00\u306e\u5b9f\u88c5\u3057\u304b\u5b58\u5728\u3057\u306a\u3044\npublic class ConsoleLogger implements Logger {\n    @Override\n    public void log(String message) {\n        System.out.println(message);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-155\">\n<h3 class=\"wp-block-heading\" id=\"i-24\">Java 8\u4ee5\u964d\u306e<code>default method<\/code> \u3068<code>static method<\/code> \u306e\u6ce8\u610f\u70b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-157\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#ffb36b;color:#FFF\" class=\"sgb-box-simple__title\">\u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#ffb36b;background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-156\">\n<li><code>default method<\/code> \u306e\u904e\u5270\u306a\u4f7f\u7528\u306f\u907f\u3051\u307e\u3057\u3087\u3046\u3002interface\u306e\u672c\u6765\u306e\u76ee\u7684\uff08\u62bd\u8c61\u5316\uff09\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/div>\n\n\n<li><code>static method<\/code> \u306f\u614e\u91cd\u306b\u8ffd\u52a0\u3057\u307e\u3057\u3087\u3046\u3002\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u95a2\u6570\u3068\u3057\u3066\u9069\u5207\u306a\u5834\u5408\u306b\u306e\u307f\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-158\">\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6ce8\u610f\u70b9\u3092\u5ff5\u982d\u306b\u7f6e\u304d\u306a\u304c\u3089interface\u3092\u8a2d\u8a08\u30fb\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u3001\u67d4\u8edf\u306aJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-159\">\n<h2 class=\"wp-block-heading\" id=\"i-25\">\u307e\u3068\u3081\uff1aJava interface\u30de\u30b9\u30bf\u30fc\u3078\u306e\u9053<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-160\">\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java interface\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u3001\u5e45\u5e83\u304f\u30ab\u30d0\u30fc\u3057\u3066\u304d\u307e\u3057\u305f\u3002interface\u306e\u6982\u5ff5\u3001\u5b9f\u88c5\u65b9\u6cd5\u3001Java 8\u4ee5\u964d\u306e\u65b0\u6a5f\u80fd\u3001\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3078\u306e\u5fdc\u7528\u3001\u305d\u3057\u3066\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u307e\u3067\u3001interface\u306e\u91cd\u8981\u6027\u3068\u67d4\u8edf\u6027\u3092\u7406\u89e3\u3067\u304d\u305f\u3053\u3068\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-161\">\n<h3 class=\"wp-block-heading\" id=\"i-26\">interface\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e3\u3064\u306e\u30ad\u30fc\u30dd\u30a4\u30f3\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-164\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\"><code>interface<\/code> \u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e3\u3064\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-162\">\n<li>\u9069\u5207\u306a\u62bd\u8c61\u5316\u30ec\u30d9\u30eb\u306e\u8a2d\u5b9a\uff1a\u5177\u4f53\u7684\u3059\u304e\u305a\u3001\u62bd\u8c61\u7684\u3059\u304e\u306a\u3044\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8a2d\u8a08\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-163\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u306e\u9075\u5b88\uff1a\u5404\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u660e\u78ba\u3067\u5358\u4e00\u306e\u76ee\u7684\u3092\u6301\u3064\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/div>\n\n\n<li>\u67d4\u8edf\u6027\u3068\u62e1\u5f35\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08\uff1a\u5c06\u6765\u306e\u5909\u66f4\u3084\u62e1\u5f35\u3092\u898b\u636e\u3048\u3066\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8a2d\u8a08\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-165\">\n<h3 class=\"wp-block-heading\" id=\"i-27\">\u3055\u3089\u306a\u308b\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/h3>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-166\">\n<li>Java\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\u3057\u3001interface\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u60c5\u5831\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-167\">\n<li>\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u95a2\u3059\u308b\u66f8\u7c4d\u3084\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u901a\u3058\u3066\u3001interface\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-168\">\n<li>\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30fc\u30c9\u3092\u5206\u6790\u3057\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306einterface\u306e\u4f7f\u7528\u4f8b\u3092\u7814\u7a76\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/div>\n\n\n<li>\u81ea\u8eab\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067interface\u3092\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u3001\u5b9f\u8df5\u7684\u306a\u30b9\u30ad\u30eb\u3092\u78e8\u304d\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>Java interface\u306e\u30de\u30b9\u30bf\u30fc\u306f\u3001\u3088\u308a\u67d4\u8edf\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u91cd\u8981\u306a\u30b9\u30c6\u30c3\u30d7\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u5b66\u3093\u3060\u77e5\u8b58\u3092\u57fa\u306b\u3001\u5b9f\u8df5\u3092\u91cd\u306d\u3001\u3088\u308a\u30af\u30ea\u30fc\u30f3\u3067\u52b9\u7387\u7684\u306aJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u80fd\u529b\u3092\u78e8\u3044\u3066\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u3002interface\u306e\u9069\u5207\u306a\u4f7f\u7528\u306f\u3001\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30ad\u30eb\u3092\u6b21\u306e\u30ec\u30d9\u30eb\u3078\u3068\u5f15\u304d\u4e0a\u3052\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u3067\u3001\u3088\u308a\u67d4\u8edf\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u304c\u300cinterface\u300d\u3067\u3059\u3002interface\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u6982\u5ff5\u306e\u4e00\u3064\u3067\u3042\u308a\u3001\u9069\u5207\u306b\u4f7f\u3044\u3053 &#8230; <\/p>\n","protected":false},"author":1,"featured_media":3047,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,68],"tags":[],"class_list":{"0":"post-318","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-java","8":"category-java-best-practice"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/318","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=318"}],"version-history":[{"count":7,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/318\/revisions"}],"predecessor-version":[{"id":3076,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/318\/revisions\/3076"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/3047"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=318"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=318"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=318"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}