{"id":693,"date":"2024-11-15T10:45:39","date_gmt":"2024-11-15T01:45:39","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=693"},"modified":"2025-03-24T08:52:55","modified_gmt":"2025-03-23T23:52:55","slug":"%e3%80%90%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%e3%80%91java%e3%81%ae%e7%b6%99%e6%89%bf%e3%82%92%e7%90%86%e8%a7%a3%e3%81%97%e3%81%a6%e8%a8%ad%e8%a8%88%e5%8a%9b%e3%82%92%e9%ab%98%e3%82%81","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=693","title":{"rendered":"\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011Java\u306e\u7d99\u627f\u3092\u7406\u89e3\u3057\u3066\u8a2d\u8a08\u529b\u3092\u9ad8\u3081\u308b\uff01\u73fe\u5834\u3067\u4f7f\u3048\u308b7\u3064\u306e\u5b9f\u8df5\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"<div id=\"sgb-css-id-1\">\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\">\u306f\u3058\u3081\u306b<\/a>  <\/li>  <li>    <a href=\"#i-1\">\uff11\uff0eJava\u306e\u7d99\u627f\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u5fb9\u5e95\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-2\">1.1 \u7d99\u627f\u306e\u57fa\u672c\u6982\u5ff5\u3068\u91cd\u8981\u6027<\/a>      <\/li>      <li>        <a href=\"#i-3\">1.2 \u7d99\u627f\u3092\u4f7f\u7528\u3059\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c83\u3064<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">1.3 \u7d99\u627f\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">\uff12\uff0e\u7d99\u627f\u306e\u7a2e\u985e\u3068\u4f7f\u3044\u5206\u3051\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">2.1 \u30af\u30e9\u30b9\u7d99\u627f\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\u306e\u9055\u3044<\/a>      <\/li>      <li>        <a href=\"#i-12\">2.2 \u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u7d99\u627f\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">2.3 \u591a\u91cd\u7d99\u627f\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">\uff13\uff0e\u5b9f\u8df5\u7684\u306a\u7d99\u627f\u306e\u4f7f\u3044\u65b97\u9078<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">3.1 \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-18\">3.2 \u6226\u7565\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u7d99\u627f\u6d3b\u7528\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-19\">3.3 \u30b3\u30f3\u30dd\u30b8\u30c3\u30c8\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u5f79\u5272<\/a>      <\/li>      <li>        <a href=\"#i-20\">3.4 \u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-21\">3.5 \u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u7d99\u627f\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-22\">3.6 \u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-23\">3.7 \u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u6d3b\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-24\">\uff14\uff0e\u7d99\u627f\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-25\">4.1 \u7d99\u627f\u306e\u6df1\u3055\u3068\u8907\u96d1\u6027\u306e\u30d0\u30e9\u30f3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-26\">4.2 LSP\uff08\u30ea\u30b9\u30b3\u30d5\u306e\u7f6e\u63db\u539f\u5247\uff09\u9055\u53cd\u306e\u56de\u907f\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-27\">4.3 \u7d99\u627f\u3088\u308a\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u9078\u3076\u3079\u304d\u5834\u9762<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-29\">\uff15\uff0e\u73fe\u5834\u3067\u4f7f\u3048\u308b\u7d99\u627f\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-30\">5.1 \u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u7d99\u627f\u8a2d\u8a08<\/a>      <\/li>      <li>        <a href=\"#i-33\">5.2 \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u9ad8\u3081\u308b\u7d99\u627f\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-36\">5.3 \u7d99\u627f\u3092\u4f7f\u3063\u305f\u8a2d\u8a08\u306e\u30ec\u30d3\u30e5\u30fc\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-41\">\uff16\uff0e\u767a\u5c55\u7684\u306a\u7d99\u627f\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-42\">6.1 \u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3068\u7d99\u627f\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-43\">6.2 \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3057\u305f\u7d99\u627f\u306e\u62e1\u5f35<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-44\">6.3 Spring Framework\u3067\u306e\u7d99\u627f\u6d3b\u7528\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-45\">\u307e\u3068\u3081<\/a>  <\/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\">\u306f\u3058\u3081\u306b<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-2\">\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3042\u308b\u300c\u7d99\u627f\u300d\u3002Java\u3067\u306e\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u306b\u304a\u3044\u3066\u3001\u3053\u306e\u7d99\u627f\u3092\u9069\u5207\u306b\u6d3b\u7528\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u306f\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u5805\u7262\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u304b\u3069\u3046\u304b\u3092\u5927\u304d\u304f\u5de6\u53f3\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-3\">\n<p>\u3057\u304b\u3057\u3001\u591a\u304f\u306e\u958b\u767a\u8005\u304c\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8ab2\u984c\u306b\u76f4\u9762\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-4\">\n<p>\u3000\u25cf \u7d99\u627f\u3092\u3044\u3064\u4f7f\u3046\u3079\u304d\u304b\u3001\u4f7f\u3046\u3079\u304d\u3067\u306a\u3044\u304b\u306e\u5224\u65ad\u304c\u96e3\u3057\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-5\">\n<p>\u3000\u25cf \u7d99\u627f\u306e\u6df1\u3055\u3084\u8907\u96d1\u3055\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u304c\u4e0a\u624b\u304f\u3067\u304d\u306a\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-6\">\n<p>\u3000\u25cf \u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u7d99\u627f\u306e\u4f7f\u3044\u65b9\u304c\u308f\u304b\u3089\u306a\u3044<\/p>\n<\/div>\n\n\n<p>\u3000\u25cf \u30c6\u30b9\u30c8\u3057\u3084\u3059\u3044\u7d99\u627f\u69cb\u9020\u306e\u8a2d\u8a08\u65b9\u6cd5\u304c\u308f\u304b\u3089\u306a\u3044<\/p>\n\n\n<div id=\"sgb-css-id-7\">\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u8ab2\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u3001Java\u306e\u7d99\u627f\u306b\u95a2\u3059\u308b\u57fa\u790e\u77e5\u8b58\u304b\u3089\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3092\u3001\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u5171\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-13\">\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\">\u672c\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<ul class=\"wp-block-list\"><div id=\"sgb-css-id-8\">\n<li>\u7d99\u627f\u306e\u57fa\u672c\u6982\u5ff5\u3068\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-9\">\n<li>\u69d8\u3005\u306a\u7d99\u627f\u30d1\u30bf\u30fc\u30f3\u3068\u305d\u306e\u4f7f\u3044\u5206\u3051<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-10\">\n<li>\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u6d3b\u7528\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-11\">\n<li>\u7d99\u627f\u306b\u304a\u3051\u308b\u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74\u3068\u305d\u306e\u56de\u907f\u65b9\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-12\">\n<li>\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/li>\n<\/div>\n\n\n<li>\u767a\u5c55\u7684\u306a\u7d99\u627f\u30c6\u30af\u30cb\u30c3\u30af<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-14\">\n<p>\u305d\u308c\u3067\u306f\u3001Java\u306e\u7d99\u627f\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-15\">\n<h2 class=\"wp-block-heading\" id=\"i-1\">\uff11\uff0eJava\u306e\u7d99\u627f\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u5fb9\u5e95\u89e3\u8aac<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-16\">\n<h3 class=\"wp-block-heading\" id=\"i-2\">1.1 \u7d99\u627f\u306e\u57fa\u672c\u6982\u5ff5\u3068\u91cd\u8981\u6027<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-17\">\n<p>\u7d99\u627f\uff08Inheritance\uff09\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u67f1\u306e\u4e00\u3064\u3067\u3059\u3002\u65e2\u5b58\u306e\u30af\u30e9\u30b9\uff08\u89aa\u30af\u30e9\u30b9\u30fb\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\uff09\u306e\u7279\u5fb4\u3084\u6a5f\u80fd\u3092\u3001\u65b0\u3057\u3044\u30af\u30e9\u30b9\uff08\u5b50\u30af\u30e9\u30b9\u30fb\u30b5\u30d6\u30af\u30e9\u30b9\uff09\u306b\u5f15\u304d\u7d99\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-18\">\n<p>\u3053\u308c\u306b\u3088\u308a\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-22\">\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\">\u7d99\u627f\u306e\u5229\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#009EF3;background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-19\">\n<li>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\u306e\u5411\u4e0a<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-20\">\n<li>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-21\">\n<li>\u62e1\u5f35\u6027\u306e\u78ba\u4fdd<\/li>\n<\/div>\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u968e\u5c64\u69cb\u9020\u5316\u306b\u3088\u308b\u7406\u89e3\u306e\u3057\u3084\u3059\u3055<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-23\">\n<h3 class=\"wp-block-heading\" id=\"i-3\">1.2 \u7d99\u627f\u3092\u4f7f\u7528\u3059\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c83\u3064<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-24\">\n<h4 class=\"wp-block-heading\" id=\"i-4\">1. \u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-25\">\n<p>\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u306e\u6a5f\u80fd\u3092\u7d99\u627f\u3059\u308b\u3053\u3068\u3067\u3001\u540c\u3058\u30b3\u30fc\u30c9\u3092\u4f55\u5ea6\u3082\u66f8\u304f\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\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=\"\">\/\/ \u57fa\u672c\u7684\u306a\u5f93\u696d\u54e1\u30af\u30e9\u30b9\npublic class Employee {\n    protected String name;\n    protected int employeeId;\n\n    public void work() {\n        System.out.println(\"\u4ed5\u4e8b\u3092\u884c\u3044\u307e\u3059\");\n    }\n}\n\n\/\/ \u55b6\u696d\u8077\u54e1\u30af\u30e9\u30b9\uff08Employee\u30af\u30e9\u30b9\u3092\u7d99\u627f\uff09\npublic class SalesEmployee extends Employee {\n    private int salesTarget;\n\n    \/\/ \u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u306a\u304c\u3089\u3001\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u8ffd\u52a0\n    public void meetCustomer() {\n        work();  \/\/ \u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\n        System.out.println(\"\u9867\u5ba2\u3068\u306e\u5546\u8ac7\u3092\u884c\u3044\u307e\u3059\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-26\">\n<h4 class=\"wp-block-heading\" id=\"i-5\">2. \u30b3\u30fc\u30c9\u306e\u4f53\u7cfb\u5316<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-27\">\n<p>\u7d99\u627f\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u985e\u4f3c\u3057\u305f\u6a5f\u80fd\u3092\u6301\u3064\u30af\u30e9\u30b9\u7fa4\u3092\u6574\u7406\u3057\u3001\u4f53\u7cfb\u7684\u306b\u7ba1\u7406\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=\"\">\/\/ \u56f3\u5f62\u306e\u57fa\u672c\u30af\u30e9\u30b9\npublic abstract class Shape {\n    protected double area;\n\n    public abstract double calculateArea();  \/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\n}\n\n\/\/ \u5186\u30af\u30e9\u30b9\npublic class Circle extends Shape {\n    private double radius;\n\n    @Override\n    public double calculateArea() {\n        return Math.PI * radius * radius;\n    }\n}\n\n\/\/ \u56db\u89d2\u5f62\u30af\u30e9\u30b9\npublic class Rectangle extends Shape {\n    private double width;\n    private double height;\n\n    @Override\n    public double calculateArea() {\n        return width * height;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-28\">\n<h4 class=\"wp-block-heading\" id=\"i-6\">3. \u6a5f\u80fd\u306e\u62e1\u5f35\u6027<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-29\">\n<p>\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u3092\u4fee\u6b63\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u8ffd\u52a0\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=\"\">\/\/ \u57fa\u672c\u7684\u306a\u30ed\u30ac\u30fc\u30af\u30e9\u30b9\npublic class Logger {\n    public void log(String message) {\n        System.out.println(message);\n    }\n}\n\n\/\/ \u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u4ed8\u304d\u30ed\u30ac\u30fc\npublic class TimestampLogger extends Logger {\n    @Override\n    public void log(String message) {\n        String timestamp = new java.util.Date().toString();\n        super.log(timestamp + \": \" + message);  \/\/ \u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u62e1\u5f35\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-30\">\n<h3 class=\"wp-block-heading\" id=\"i-7\">1.3 \u7d99\u627f\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-31\">\n<p>Java\u3067\u306e\u7d99\u627f\u306f <code>extends<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u30d1\u30bf\u30fc\u30f3\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=\"\">\/\/ \u57fa\u672c\u7684\u306a\u7d99\u627f\u306e\u4f8b\npublic class Animal {\n    protected String name;\n\n    public void eat() {\n        System.out.println(name + \"\u304c\u98df\u4e8b\u3092\u3057\u3066\u3044\u307e\u3059\");\n    }\n\n    public void sleep() {\n        System.out.println(name + \"\u304c\u7761\u7720\u3092\u3068\u3063\u3066\u3044\u307e\u3059\");\n    }\n}\n\n\/\/ Animal\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u305f\u72ac\u30af\u30e9\u30b9\npublic class Dog extends Animal {\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    public Dog(String name) {\n        this.name = name;\n    }\n\n    \/\/ \u72ec\u81ea\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\n    public void bark() {\n        System.out.println(name + \"\u304c\u5420\u3048\u3066\u3044\u307e\u3059\");\n    }\n\n    \/\/ \u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\n    @Override\n    public void eat() {\n        System.out.println(name + \"\u304c\u9aa8\u3092\u98df\u3079\u3066\u3044\u307e\u3059\");\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\npublic class Main {\n    public static void main(String[] args) {\n        Dog dog = new Dog(\"\u30dd\u30c1\");\n        dog.eat();    \/\/ \"\u30dd\u30c1\u304c\u9aa8\u3092\u98df\u3079\u3066\u3044\u307e\u3059\"\n        dog.sleep();  \/\/ \"\u30dd\u30c1\u304c\u7761\u7720\u3092\u3068\u3063\u3066\u3044\u307e\u3059\"\n        dog.bark();   \/\/ \"\u30dd\u30c1\u304c\u5420\u3048\u3066\u3044\u307e\u3059\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-35\">\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\">\u7d99\u627f\u4f7f\u7528\u6642\u306e\u91cd\u8981\u306a\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-32\">\n<li><code>extends<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9\u306f1\u3064\u306e\u30af\u30e9\u30b9\u306b\u3057\u304b\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\uff08\u5358\u4e00\u7d99\u627f\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-33\">\n<li><code>protected<\/code> \u4fee\u98fe\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u30e1\u30f3\u30d0\u30fc\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-34\">\n<li><code>@Override<\/code> \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3092\u660e\u793a\u3067\u304d\u307e\u3059<\/li>\n<\/div>\n\n\n<li><code>super<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u89aa\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-36\">\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3068\u5b9f\u88c5\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u7d99\u627f\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3057\u305f\u8a2d\u8a08\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-37\">\n<h2 class=\"wp-block-heading\" id=\"i-8\">\uff12\uff0e\u7d99\u627f\u306e\u7a2e\u985e\u3068\u4f7f\u3044\u5206\u3051\u65b9<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-38\">\n<h3 class=\"wp-block-heading\" id=\"i-9\">2.1 \u30af\u30e9\u30b9\u7d99\u627f\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\u306e\u9055\u3044<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-39\">\n<p>Java\u306b\u306f\u5927\u304d\u304f\u5206\u3051\u30662\u7a2e\u985e\u306e\u7d99\u627f\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u7d99\u627f\uff08<code>extends<\/code>\uff09\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\uff08<code>implements<\/code>\uff09\u3002\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3068\u4f7f\u3044\u5206\u3051\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-40\">\n<h4 class=\"wp-block-heading\" id=\"i-10\">\uff11.\u30af\u30e9\u30b9\u7d99\u627f\u306e\u7279\u5fb4<\/h4>\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=\"\">\/\/ \u57fa\u672c\u30af\u30e9\u30b9\npublic class Vehicle {\n    protected String brand;\n    protected int year;\n\n    public void start() {\n        System.out.println(\"\u30a8\u30f3\u30b8\u30f3\u3092\u59cb\u52d5\u3057\u307e\u3059\");\n    }\n\n    public void stop() {\n        System.out.println(\"\u30a8\u30f3\u30b8\u30f3\u3092\u505c\u6b62\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u30af\u30e9\u30b9\u7d99\u627f\u306e\u4f8b\npublic class Car extends Vehicle {\n    private int numberOfDoors;\n\n    public void openTrunk() {\n        System.out.println(\"\u30c8\u30e9\u30f3\u30af\u3092\u958b\u304d\u307e\u3059\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-44\">\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\">\u30af\u30e9\u30b9\u7d99\u627f\u306e\u4e3b\u306a\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-41\">\n<li>\u5358\u4e00\u7d99\u627f\u306e\u307f\u53ef\u80fd\uff081\u3064\u306e\u30af\u30e9\u30b9\u3057\u304b\u7d99\u627f\u3067\u304d\u306a\u3044\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-42\">\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u5f15\u304d\u7d99\u3052\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-43\">\n<li>\u30d5\u30a3\u30fc\u30eb\u30c9\u3082\u7d99\u627f\u3067\u304d\u308b<\/li>\n<\/div>\n\n\n<li><code>protected<\/code>\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-45\">\n<h4 class=\"wp-block-heading\" id=\"i-11\">\uff12.\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\u306e\u7279\u5fb4<\/h4>\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\u5b9a\u7fa9\npublic interface Drawable {\n    void draw();  \/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\n\n    \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\uff08Java 8\u4ee5\u964d\uff09\n    default void prepare() {\n        System.out.println(\"\u63cf\u753b\u306e\u6e96\u5099\u3092\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\u306e\u4f8b\npublic class Circle implements Drawable {\n    @Override\n    public void draw() {\n        System.out.println(\"\u5186\u3092\u63cf\u753b\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u53ef\u80fd\npublic class Rectangle implements Drawable, Resizable {\n    @Override\n    public void draw() {\n        System.out.println(\"\u56db\u89d2\u5f62\u3092\u63cf\u753b\u3057\u307e\u3059\");\n    }\n\n    @Override\n    public void resize(int factor) {\n        System.out.println(\"\u30b5\u30a4\u30ba\u3092\" + factor + \"\u500d\u306b\u5909\u66f4\u3057\u307e\u3059\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-49\">\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\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u7d99\u627f\u306e\u4e3b\u306a\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-46\">\n<li>\u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u53ef\u80fd<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-47\">\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u306e\u307f\uff08Java 8\u4ee5\u964d\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u53ef\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-48\">\n<li>\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u5b9a\u6570\u306e\u307f\u5b9a\u7fa9\u53ef\u80fd<\/li>\n<\/div>\n\n\n<li>\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u6697\u9ed9\u7684\u306b<code>public<\/code><\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-50\">\n<h3 class=\"wp-block-heading\" id=\"i-12\">2.2 \u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u7d99\u627f\u30d1\u30bf\u30fc\u30f3<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-51\">\n<p>\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u30af\u30e9\u30b9\u7d99\u627f\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e2d\u9593\u7684\u306a\u7279\u5fb4\u3092\u6301\u3061\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=\"\">\/\/ \u62bd\u8c61\u30af\u30e9\u30b9\u306e\u4f8b\npublic abstract class DatabaseConnection {\n    protected String connectionString;\n    protected boolean isConnected;\n\n    \/\/ \u5177\u8c61\u30e1\u30bd\u30c3\u30c9\n    public void disconnect() {\n        isConnected = false;\n        System.out.println(\"\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u5207\u65ad\u3057\u307e\u3057\u305f\");\n    }\n\n    \/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\n    public abstract void connect();\n    public abstract void executeQuery(String query);\n}\n\n\/\/ \u5177\u8c61\u30af\u30e9\u30b9\u3067\u306e\u5b9f\u88c5\npublic class MySQLConnection extends DatabaseConnection {\n    @Override\n    public void connect() {\n        \/\/ MySQL\u56fa\u6709\u306e\u63a5\u7d9a\u51e6\u7406\n        isConnected = true;\n        System.out.println(\"MySQL\u306b\u63a5\u7d9a\u3057\u307e\u3057\u305f\");\n    }\n\n    @Override\n    public void executeQuery(String query) {\n        \/\/ MySQL\u56fa\u6709\u306e\u30af\u30a8\u30ea\u5b9f\u884c\u51e6\u7406\n        System.out.println(\"MySQL\u3067\u30af\u30a8\u30ea\u3092\u5b9f\u884c: \" + query);\n    }\n}<\/pre>\n\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\">\u62bd\u8c61\u30af\u30e9\u30b9\u306e\u4e3b\u306a\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-52\">\n<li>\u4e00\u90e8\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u6e08\u307f\u306b\u3067\u304d\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-53\">\n<li>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u3081\u3089\u308c\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-54\">\n<li>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u6301\u3066\u308b<\/li>\n<\/div>\n\n\n<li><code>protected<\/code>\u30e1\u30f3\u30d0\u30fc\u3092\u4f7f\u7528\u53ef\u80fd<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-56\">\n<h3 class=\"wp-block-heading\" id=\"i-13\">2.3 \u591a\u91cd\u7d99\u627f\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-57\">\n<p>Java 8\u4ee5\u964d\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u53ef\u80fd\u306b\u306a\u308a\u3001\u7591\u4f3c\u7684\u306a\u591a\u91cd\u7d99\u627f\u304c\u5b9f\u73fe\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=\"\">\/\/ \u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\npublic interface Printable {\n    default void print() {\n        System.out.println(\"\u6587\u66f8\u3092\u5370\u5237\u3057\u307e\u3059\");\n    }\n}\n\npublic interface Scannable {\n    default void scan() {\n        System.out.println(\"\u6587\u66f8\u3092\u30b9\u30ad\u30e3\u30f3\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u8907\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\npublic class MultiFunctionPrinter implements Printable, Scannable {\n    \/\/ \u4e21\u65b9\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6a5f\u80fd\u3092\u5229\u7528\u53ef\u80fd\n    public void copyDocument() {\n        scan();  \/\/ Scannable\u304b\u3089\n        print(); \/\/ Printable\u304b\u3089\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-58\">\n<h4 class=\"wp-block-heading\" id=\"i-14\">\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306e\u885d\u7a81\u89e3\u6c7a<\/h4>\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 A {\n    default void process() {\n        System.out.println(\"A's process\");\n    }\n}\n\npublic interface B {\n    default void process() {\n        System.out.println(\"B's process\");\n    }\n}\n\n\/\/ \u885d\u7a81\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\u660e\u793a\u7684\u306a\u5b9f\u88c5\u304c\u5fc5\u8981\npublic class C implements A, B {\n    @Override\n    public void process() {\n        \/\/ \u7279\u5b9a\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3092\u9078\u629e\n        A.super.process();\n        \/\/ \u307e\u305f\u306f\u72ec\u81ea\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-59\">\n<h4 class=\"wp-block-heading\" id=\"i-15\">\u7d99\u627f\u30d1\u30bf\u30fc\u30f3\u306e\u4f7f\u3044\u5206\u3051\u57fa\u6e96<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-60\">\n<p>\u30001. \u30af\u30e9\u30b9\u7d99\u627f\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-61\">\n<p>\u3000\u3000\u25cf \u65e2\u5b58\u30af\u30e9\u30b9\u306e\u6a5f\u80fd\u3092\u62e1\u5f35\u3059\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-62\">\n<p>\u3000\u3000\u25cf \u5177\u4f53\u7684\u306a\u5b9f\u88c5\u3092\u518d\u5229\u7528\u3059\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-63\">\n<p>\u3000\u3000\u25cf IS-A\u95a2\u4fc2\u304c\u6210\u308a\u7acb\u3064<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-64\">\n<p>\u30002. \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-65\">\n<p>\u3000\u3000\u25cf \u8907\u6570\u306e\u578b\u3068\u3057\u3066\u632f\u308b\u821e\u3046\u5fc5\u8981\u304c\u3042\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-66\">\n<p>\u3000\u3000\u25cf \u5b9f\u88c5\u306e\u8a73\u7d30\u3092\u96a0\u853d\u3057\u305f\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-67\">\n<p>\u3000\u3000\u25cf \u758e\u7d50\u5408\u306a\u8a2d\u8a08\u3092\u5b9f\u73fe\u3057\u305f\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-68\">\n<p>\u30003. \u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-69\">\n<p>\u3000\u3000\u25cf \u5171\u901a\u306e\u5b9f\u88c5\u3092\u6301\u3064\u95a2\u9023\u30af\u30e9\u30b9\u3092\u307e\u3068\u3081\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-70\">\n<p>\u3000\u3000\u25cf \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b<\/p>\n<\/div>\n\n\n<p>\u3000\u3000\u25cf \u4e00\u90e8\u306e\u5b9f\u88c5\u3092\u5f37\u5236\u3057\u305f\u3044<\/p>\n\n\n<div id=\"sgb-css-id-71\">\n<p>\u3053\u308c\u3089\u306e\u7d99\u627f\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u67d4\u8edf\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-72\">\n<h2 class=\"wp-block-heading\" id=\"i-16\">\uff13\uff0e\u5b9f\u8df5\u7684\u306a\u7d99\u627f\u306e\u4f7f\u3044\u65b97\u9078<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-73\">\n<h3 class=\"wp-block-heading\" id=\"i-17\">3.1 \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-74\">\n<p>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9aa8\u683c\u3092\u5b9a\u7fa9\u3057\u306a\u304c\u3089\u3001\u4e00\u90e8\u306e\u624b\u9806\u3092\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u30d1\u30bf\u30fc\u30f3\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=\"\">\/\/ \u30c7\u30fc\u30bf\u51e6\u7406\u306e\u57fa\u672c\u30af\u30e9\u30b9\npublic abstract class DataProcessor {\n    \/\/ \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\n    public final void processData() {\n        readData();        \/\/ \u30c7\u30fc\u30bf\u8aad\u307f\u8fbc\u307f\n        validateData();    \/\/ \u30c7\u30fc\u30bf\u691c\u8a3c\n        transform();      \/\/ \u30c7\u30fc\u30bf\u5909\u63db\uff08\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\uff09\n        save();          \/\/ \u30c7\u30fc\u30bf\u4fdd\u5b58\uff08\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\uff09\n        notify(\"\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f\");\n    }\n\n    \/\/ \u5171\u901a\u306e\u5b9f\u88c5\n    private void readData() {\n        System.out.println(\"\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3059\");\n    }\n\n    private void validateData() {\n        System.out.println(\"\u30c7\u30fc\u30bf\u3092\u691c\u8a3c\u3057\u307e\u3059\");\n    }\n\n    \/\/ \u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9\n    protected abstract void transform();\n    protected abstract void save();\n\n    \/\/ \u30d5\u30c3\u30af\u7528\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5b9f\u88c5\n    protected void notify(String message) {\n        System.out.println(message);\n    }\n}\n\n\/\/ CSV\u51e6\u7406\u7528\u306e\u5177\u8c61\u30af\u30e9\u30b9\npublic class CSVProcessor extends DataProcessor {\n    @Override\n    protected void transform() {\n        System.out.println(\"CSV\u30c7\u30fc\u30bf\u3092\u5909\u63db\u3057\u307e\u3059\");\n    }\n\n    @Override\n    protected void save() {\n        System.out.println(\"\u5909\u63db\u3057\u305f\u30c7\u30fc\u30bf\u3092CSV\u5f62\u5f0f\u3067\u4fdd\u5b58\u3057\u307e\u3059\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-75\">\n<h3 class=\"wp-block-heading\" id=\"i-18\">3.2 \u6226\u7565\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u7d99\u627f\u6d3b\u7528\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-76\">\n<p>\u6226\u7565\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u30d5\u30a1\u30df\u30ea\u30fc\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u308c\u305e\u308c\u3092\u4e92\u63db\u6027\u306e\u3042\u308b\u5f62\u3067\u5229\u7528\u53ef\u80fd\u306b\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=\"\">\/\/ \u652f\u6255\u3044\u6226\u7565\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface PaymentStrategy {\n    void pay(int amount);\n}\n\n\/\/ \u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u652f\u6255\u3044\npublic class CreditCardPayment implements PaymentStrategy {\n    private String cardNumber;\n\n    public CreditCardPayment(String cardNumber) {\n        this.cardNumber = cardNumber;\n    }\n\n    @Override\n    public void pay(int amount) {\n        System.out.println(amount + \"\u5186\u3092\u30ab\u30fc\u30c9\" + cardNumber + \"\u3067\u652f\u6255\u3044\u307e\u3057\u305f\");\n    }\n}\n\n\/\/ \u96fb\u5b50\u30de\u30cd\u30fc\u652f\u6255\u3044\npublic class ElectronicMoneyPayment implements PaymentStrategy {\n    private String accountId;\n\n    public ElectronicMoneyPayment(String accountId) {\n        this.accountId = accountId;\n    }\n\n    @Override\n    public void pay(int amount) {\n        System.out.println(amount + \"\u5186\u3092\u96fb\u5b50\u30de\u30cd\u30fc\" + accountId + \"\u3067\u652f\u6255\u3044\u307e\u3057\u305f\");\n    }\n}\n\n\/\/ \u652f\u6255\u3044\u51e6\u7406\u30af\u30e9\u30b9\npublic class PaymentProcessor {\n    private PaymentStrategy paymentStrategy;\n\n    public void setPaymentStrategy(PaymentStrategy strategy) {\n        this.paymentStrategy = strategy;\n    }\n\n    public void processPayment(int amount) {\n        paymentStrategy.pay(amount);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-77\">\n<h3 class=\"wp-block-heading\" id=\"i-19\">3.3 \u30b3\u30f3\u30dd\u30b8\u30c3\u30c8\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u5f79\u5272<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-78\">\n<p>\u30b3\u30f3\u30dd\u30b8\u30c3\u30c8\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u500b\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u8907\u5408\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u540c\u3058\u3088\u3046\u306b\u6271\u3048\u308b\u3088\u3046\u306b\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=\"\">\/\/ \u5171\u901a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface FileSystemComponent {\n    void showInfo();\n    int getSize();\n}\n\n\/\/ \u30d5\u30a1\u30a4\u30eb\u30af\u30e9\u30b9\uff08\u30ea\u30fc\u30d5\uff09\npublic class File implements FileSystemComponent {\n    private String name;\n    private int size;\n\n    public File(String name, int size) {\n        this.name = name;\n        this.size = size;\n    }\n\n    @Override\n    public void showInfo() {\n        System.out.println(\"File: \" + name + \" (Size: \" + size + \"KB)\");\n    }\n\n    @Override\n    public int getSize() {\n        return size;\n    }\n}\n\n\/\/ \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u30af\u30e9\u30b9\uff08\u30b3\u30f3\u30dd\u30b8\u30c3\u30c8\uff09\npublic class Directory implements FileSystemComponent {\n    private String name;\n    private List&lt;FileSystemComponent&gt; components = new ArrayList&lt;&gt;();\n\n    public Directory(String name) {\n        this.name = name;\n    }\n\n    public void addComponent(FileSystemComponent component) {\n        components.add(component);\n    }\n\n    @Override\n    public void showInfo() {\n        System.out.println(\"Directory: \" + name);\n        components.forEach(FileSystemComponent::showInfo);\n    }\n\n    @Override\n    public int getSize() {\n        return components.stream()\n                .mapToInt(FileSystemComponent::getSize)\n                .sum();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-79\">\n<h3 class=\"wp-block-heading\" id=\"i-20\">3.4 \u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-80\">\n<p>\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u3092\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u59d4\u306d\u308b\u30d1\u30bf\u30fc\u30f3\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=\"\">\/\/ \u88fd\u54c1\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface Document {\n    void open();\n    void save();\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u88fd\u54c1\u30af\u30e9\u30b9\npublic class PDFDocument implements Document {\n    @Override\n    public void open() {\n        System.out.println(\"PDF\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u958b\u304d\u307e\u3059\");\n    }\n\n    @Override\n    public void save() {\n        System.out.println(\"PDF\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u4fdd\u5b58\u3057\u307e\u3059\");\n    }\n}\n\npublic class WordDocument implements Document {\n    @Override\n    public void open() {\n        System.out.println(\"Word\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u958b\u304d\u307e\u3059\");\n    }\n\n    @Override\n    public void save() {\n        System.out.println(\"Word\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u4fdd\u5b58\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\npublic abstract class DocumentCreator {\n    \/\/ \u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\n    protected abstract Document createDocument();\n\n    \/\/ \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\n    public Document openDocument() {\n        Document doc = createDocument();\n        doc.open();\n        return doc;\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\npublic class PDFDocumentCreator extends DocumentCreator {\n    @Override\n    protected Document createDocument() {\n        return new PDFDocument();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-81\">\n<h3 class=\"wp-block-heading\" id=\"i-21\">3.5 \u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u7d99\u627f\u306e\u4f7f\u3044\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-82\">\n<p>\u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u90e8\u72b6\u614b\u306b\u5fdc\u3058\u3066\u632f\u308b\u821e\u3044\u3092\u5909\u66f4\u3067\u304d\u308b\u3088\u3046\u306b\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=\"\">\/\/ \u72b6\u614b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface OrderState {\n    void nextState(Order order);\n    void cancel(Order order);\n    String getStatus();\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u72b6\u614b\u30af\u30e9\u30b9\npublic class NewOrderState implements OrderState {\n    @Override\n    public void nextState(Order order) {\n        order.setState(new ProcessingState());\n    }\n\n    @Override\n    public void cancel(Order order) {\n        order.setState(new CancelledState());\n    }\n\n    @Override\n    public String getStatus() {\n        return \"\u6ce8\u6587\u53d7\u4ed8\";\n    }\n}\n\npublic class ProcessingState implements OrderState {\n    @Override\n    public void nextState(Order order) {\n        order.setState(new ShippedState());\n    }\n\n    @Override\n    public void cancel(Order order) {\n        System.out.println(\"\u51e6\u7406\u4e2d\u306e\u6ce8\u6587\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3067\u304d\u307e\u305b\u3093\");\n    }\n\n    @Override\n    public String getStatus() {\n        return \"\u51e6\u7406\u4e2d\";\n    }\n}\n\n\/\/ \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30af\u30e9\u30b9\npublic class Order {\n    private OrderState state;\n    private String orderNumber;\n\n    public Order(String orderNumber) {\n        this.orderNumber = orderNumber;\n        this.state = new NewOrderState();\n    }\n\n    public void setState(OrderState state) {\n        this.state = state;\n    }\n\n    public void nextState() {\n        state.nextState(this);\n    }\n\n    public void cancel() {\n        state.cancel(this);\n    }\n\n    public String getStatus() {\n        return state.getStatus();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-83\">\n<h3 class=\"wp-block-heading\" id=\"i-22\">3.6 \u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-84\">\n<p>\u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u52d5\u7684\u306b\u65b0\u3057\u3044\u8cac\u52d9\u3092\u8ffd\u52a0\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=\"\">\/\/ \u57fa\u672c\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface Notifier {\n    void send(String message);\n}\n\n\/\/ \u57fa\u672c\u5b9f\u88c5\npublic class BasicNotifier implements Notifier {\n    @Override\n    public void send(String message) {\n        System.out.println(\"\u57fa\u672c\u901a\u77e5: \" + message);\n    }\n}\n\n\/\/ \u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\u57fa\u5e95\u30af\u30e9\u30b9\npublic abstract class NotifierDecorator implements Notifier {\n    protected Notifier notifier;\n\n    public NotifierDecorator(Notifier notifier) {\n        this.notifier = notifier;\n    }\n\n    @Override\n    public void send(String message) {\n        notifier.send(message);\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30c7\u30b3\u30ec\u30fc\u30bf\u30fc\npublic class SlackNotifier extends NotifierDecorator {\n    public SlackNotifier(Notifier notifier) {\n        super(notifier);\n    }\n\n    @Override\n    public void send(String message) {\n        super.send(message);\n        System.out.println(\"Slack\u901a\u77e5: \" + message);\n    }\n}\n\npublic class EmailNotifier extends NotifierDecorator {\n    public EmailNotifier(Notifier notifier) {\n        super(notifier);\n    }\n\n    @Override\n    public void send(String message) {\n        super.send(message);\n        System.out.println(\"\u30e1\u30fc\u30eb\u901a\u77e5: \" + message);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-85\">\n<h3 class=\"wp-block-heading\" id=\"i-23\">3.7 \u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u6d3b\u7528<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-86\">\n<p>\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306e1\u5bfe\u591a\u306e\u4f9d\u5b58\u95a2\u4fc2\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=\"\">\/\/ \u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface Observer {\n    void update(String event);\n}\n\n\/\/ \u30b5\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u89b3\u5bdf\u5bfe\u8c61\uff09\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface Subject {\n    void registerObserver(Observer observer);\n    void removeObserver(Observer observer);\n    void notifyObservers();\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\npublic class NewsAgency implements Subject {\n    private List&lt;Observer&gt; observers = new ArrayList&lt;&gt;();\n    private String news;\n\n    @Override\n    public void registerObserver(Observer observer) {\n        observers.add(observer);\n    }\n\n    @Override\n    public void removeObserver(Observer observer) {\n        observers.remove(observer);\n    }\n\n    @Override\n    public void notifyObservers() {\n        observers.forEach(observer -&gt; observer.update(news));\n    }\n\n    public void setNews(String news) {\n        this.news = news;\n        notifyObservers();\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\npublic class NewsChannel implements Observer {\n    private String name;\n\n    public NewsChannel(String name) {\n        this.name = name;\n    }\n\n    @Override\n    public void update(String news) {\n        System.out.println(name + \"\u304c\u6b21\u306e\u30cb\u30e5\u30fc\u30b9\u3092\u53d7\u4fe1: \" + news);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-87\">\n<p>\u5404\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u7d99\u627f\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u52b9\u679c\u7684\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u67d4\u8edf\u3067\u62e1\u5f35\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u8a2d\u8a08\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-88\">\n<h2 class=\"wp-block-heading\" id=\"i-24\">\uff14\uff0e\u7d99\u627f\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-89\">\n<h3 class=\"wp-block-heading\" id=\"i-25\">4.1 \u7d99\u627f\u306e\u6df1\u3055\u3068\u8907\u96d1\u6027\u306e\u30d0\u30e9\u30f3\u30b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-90\">\n<p>\u7d99\u627f\u306e\u6df1\u3055\u304c\u5897\u3059\u307b\u3069\u3001\u30b3\u30fc\u30c9\u306e\u7406\u89e3\u3068\u4fdd\u5b88\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u7d99\u627f\u306e\u968e\u5c64\u304c\u6df1\u304f\u306a\u308a\u3059\u304e\u305f\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=\"\">\/\/ \u7d99\u627f\u304c\u6df1\u3059\u304e\u308b\u4f8b\npublic class Vehicle { }\npublic class LandVehicle extends Vehicle { }\npublic class Car extends LandVehicle { }\npublic class SportsCar extends Car { }\npublic class RaceCar extends SportsCar { }\npublic class FormulaOneCar extends RaceCar { }\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u7d99\u627f\u968e\u5c64\u3092\u6d45\u304f\u3057\u3001\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\npublic class Vehicle {\n    protected Engine engine;\n    protected Transmission transmission;\n}\n\npublic class Car extends Vehicle {\n    private CarType type;\n    private PerformanceSpec specs;\n}<\/pre>\n\n\n<div id=\"sgb-css-id-94\">\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\">\u7d99\u627f\u306e\u6df1\u3055\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/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-91\">\n<li>\u7d99\u627f\u306e\u6df1\u3055\u306f3\u968e\u5c64\u4ee5\u5185\u306b\u6291\u3048\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-92\">\n<li>IS-A\u95a2\u4fc2\u304c\u660e\u78ba\u306a\u5834\u5408\u306e\u307f\u7d99\u627f\u3092\u4f7f\u7528<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-93\">\n<li>\u6a5f\u80fd\u306e\u8ffd\u52a0\u306f\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u691c\u8a0e<\/li>\n<\/div>\n\n\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6d3b\u7528\u3057\u3066\u67d4\u8edf\u6027\u3092\u78ba\u4fdd<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-95\">\n<h3 class=\"wp-block-heading\" id=\"i-26\">4.2 LSP\uff08\u30ea\u30b9\u30b3\u30d5\u306e\u7f6e\u63db\u539f\u5247\uff09\u9055\u53cd\u306e\u56de\u907f\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-96\">\n<p>LSP\u306f\u3001\u57fa\u5e95\u30af\u30e9\u30b9\u304c\u4f7f\u7528\u3055\u308c\u308b\u5834\u6240\u3067\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u7f6e\u304d\u63db\u3048\u3066\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3059\u308b\u3053\u3068\u3092\u8981\u6c42\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=\"\">\/\/ LSP\u9055\u53cd\u306e\u4f8b\npublic class Rectangle {\n    protected int width;\n    protected int height;\n\n    public void setWidth(int width) {\n        this.width = width;\n    }\n\n    public void setHeight(int height) {\n        this.height = height;\n    }\n\n    public int getArea() {\n        return width * height;\n    }\n}\n\npublic class Square extends Rectangle {\n    \/\/ \u6b63\u65b9\u5f62\u306f\u5e38\u306b\u5e45\u3068\u9ad8\u3055\u304c\u540c\u3058\u3067\u3042\u308b\u3079\u304d\u3060\u304c...\n    @Override\n    public void setWidth(int width) {\n        super.setWidth(width);\n        super.setHeight(width);  \/\/ LSP\u9055\u53cd\uff01\n    }\n\n    @Override\n    public void setHeight(int height) {\n        super.setWidth(height);\n        super.setHeight(height);  \/\/ LSP\u9055\u53cd\uff01\n    }\n}\n\n\/\/ LSP\u9055\u53cd\u3092\u89e3\u6d88\u3057\u305f\u4f8b\npublic interface Shape {\n    int getArea();\n}\n\npublic class Rectangle implements Shape {\n    private int width;\n    private int height;\n\n    public Rectangle(int width, int height) {\n        this.width = width;\n        this.height = height;\n    }\n\n    @Override\n    public int getArea() {\n        return width * height;\n    }\n}\n\npublic class Square implements Shape {\n    private int side;\n\n    public Square(int side) {\n        this.side = side;\n    }\n\n    @Override\n    public int getArea() {\n        return side * side;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-97\">\n<h3 class=\"wp-block-heading\" id=\"i-27\">4.3 \u7d99\u627f\u3088\u308a\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u9078\u3076\u3079\u304d\u5834\u9762<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-98\">\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u3001\u7d99\u627f\u3088\u308a\u3082\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u9078\u629e\u3059\u3079\u304d\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-101\">\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\">\u7d99\u627f\u3088\u308a\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u9078\u629e\u3059\u3079\u304d\u5834\u9762<\/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-99\">\n<li>\u632f\u308b\u821e\u3044\u306e\u518d\u5229\u7528\u304c\u76ee\u7684\u306e\u5834\u5408<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-100\">\n<li>\u5b9f\u884c\u6642\u306b\u632f\u308b\u821e\u3044\u3092\u5909\u66f4\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/div>\n\n\n<li>\u8907\u6570\u306e\u6a5f\u80fd\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u3044\u5834\u5408<\/li>\n<\/ol>\n<\/div><\/div>\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=\"\">\/\/ \u7d99\u627f\u3092\u4f7f\u3063\u305f\u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\npublic class EmailSender {\n    public void send(String message) {\n        \/\/ \u30e1\u30fc\u30eb\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\n    }\n}\n\npublic class LoggingEmailSender extends EmailSender {\n    @Override\n    public void send(String message) {\n        System.out.println(\"\u9001\u4fe1\u958b\u59cb: \" + message);\n        super.send(message);\n        System.out.println(\"\u9001\u4fe1\u5b8c\u4e86\");\n    }\n}\n\n\/\/ \u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u305f\u6539\u5584\u5b9f\u88c5\npublic interface MessageSender {\n    void send(String message);\n}\n\npublic class EmailSender implements MessageSender {\n    @Override\n    public void send(String message) {\n        \/\/ \u30e1\u30fc\u30eb\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\n    }\n}\n\npublic class LoggingDecorator implements MessageSender {\n    private final MessageSender wrapped;\n\n    public LoggingDecorator(MessageSender wrapped) {\n        this.wrapped = wrapped;\n    }\n\n    @Override\n    public void send(String message) {\n        System.out.println(\"\u9001\u4fe1\u958b\u59cb: \" + message);\n        wrapped.send(message);\n        System.out.println(\"\u9001\u4fe1\u5b8c\u4e86\");\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nMessageSender sender = new LoggingDecorator(new EmailSender());<\/pre>\n\n\n<div id=\"sgb-css-id-102\">\n<h4 class=\"wp-block-heading\" id=\"i-28\">\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u63a8\u5968\u306e\u5224\u65ad\u57fa\u6e96<\/h4>\n<\/div>\n\n<div id=\"id-b55aae59-a9de-40b3-8cbf-d9e66a772107\"><div id=\"sgb-css-id-103\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u72b6\u6cc1<\/th><th>\u7d99\u627f<\/th><th>\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3<\/th><\/tr><\/thead><tbody><tr><td>IS-A\u95a2\u4fc2\u304c\u6210\u7acb<\/td><td>\u25ef<\/td><td>\u25b3<\/td><\/tr><tr><td>HAS-A\u95a2\u4fc2\u304c\u6210\u7acb<\/td><td>\u00d7<\/td><td>\u25ef<\/td><\/tr><tr><td>\u632f\u308b\u821e\u3044\u306e\u518d\u5229\u7528<\/td><td>\u25b3<\/td><td>\u25ef<\/td><\/tr><tr><td>\u5b9f\u884c\u6642\u306e\u632f\u308b\u821e\u3044\u5909\u66f4<\/td><td>\u00d7<\/td><td>\u25ef<\/td><\/tr><tr><td>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528<\/td><td>\u25ef<\/td><td>\u25ef<\/td><\/tr><tr><td>\u758e\u7d50\u5408\u6027<\/td><td>\u25b3<\/td><td>\u25ef<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-104\">\n<p>\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3084\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u5bfe\u51e6\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u3001\u5805\u7262\u306a\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7d99\u627f\u306f\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001\u4f7f\u7528\u3059\u308b\u969b\u306f\u614e\u91cd\u306b\u691c\u8a0e\u3057\u3001\u3088\u308a\u9069\u5207\u306a\u4ee3\u66ff\u624b\u6bb5\u304c\u306a\u3044\u304b\u5e38\u306b\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-105\">\n<h2 class=\"wp-block-heading\" id=\"i-29\">\uff15\uff0e\u73fe\u5834\u3067\u4f7f\u3048\u308b\u7d99\u627f\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-106\">\n<h3 class=\"wp-block-heading\" id=\"i-30\">5.1 \u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u7d99\u627f\u8a2d\u8a08<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-107\">\n<p>\u30c6\u30b9\u30c8\u5bb9\u6613\u6027\u306f\u3001\u7d99\u627f\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u91cd\u8981\u306a\u8003\u616e\u70b9\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u30c6\u30b9\u30bf\u30d6\u30eb\u306a\u7d99\u627f\u8a2d\u8a08\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-108\">\n<h4 class=\"wp-block-heading\" id=\"i-31\">1. \u4f9d\u5b58\u6027\u306e\u6ce8\u5165\u3092\u6d3b\u7528\u3059\u308b<\/h4>\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=\"\">\/\/ \u30c6\u30b9\u30c8\u304c\u56f0\u96e3\u306a\u5b9f\u88c5\npublic class DataProcessor {\n    private Database database = new Database();  \/\/ \u5f37\u7d50\u5408\n\n    public void process(Data data) {\n        database.save(data);\n    }\n}\n\n\/\/ \u30c6\u30b9\u30bf\u30d6\u30eb\u306a\u5b9f\u88c5\npublic class DataProcessor {\n    private DatabaseInterface database;  \/\/ \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\n    public DataProcessor(DatabaseInterface database) {\n        this.database = database;\n    }\n\n    public void process(Data data) {\n        database.save(data);\n    }\n}\n\n\/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\npublic class DataProcessorTest {\n    @Test\n    public void testProcess() {\n        \/\/ \u30e2\u30c3\u30af\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u4f7f\u7528\n        DatabaseInterface mockDb = mock(DatabaseInterface.class);\n        DataProcessor processor = new DataProcessor(mockDb);\n\n        Data testData = new Data();\n        processor.process(testData);\n\n        verify(mockDb).save(testData);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-109\">\n<h4 class=\"wp-block-heading\" id=\"i-32\">2. Protected \u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8<\/h4>\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=\"\">\/\/ \u30c6\u30b9\u30c8\u7528\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u4f5c\u6210\npublic class TestableBaseClass extends BaseClass {\n    \/\/ protected\u30e1\u30bd\u30c3\u30c9\u3092\u30c6\u30b9\u30c8\u7528\u306b\u516c\u958b\n    public void publicTestMethod() {\n        super.protectedMethod();\n    }\n}\n\n@Test\npublic void testProtectedMethod() {\n    TestableBaseClass testInstance = new TestableBaseClass();\n    testInstance.publicTestMethod();\n    \/\/ \u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\n}<\/pre>\n\n\n<div id=\"sgb-css-id-110\">\n<h3 class=\"wp-block-heading\" id=\"i-33\">5.2 \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u9ad8\u3081\u308b\u7d99\u627f\u306e\u4f7f\u3044\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-111\">\n<h4 class=\"wp-block-heading\" id=\"i-34\">1. \u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u3092\u5b88\u308b<\/h4>\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=\"\">\/\/ \u826f\u304f\u306a\u3044\u4f8b\uff1a\u8907\u6570\u306e\u8cac\u4efb\u3092\u6301\u3064\u30af\u30e9\u30b9\npublic class UserManager extends DatabaseConnection {\n    public void createUser(User user) {\n        connect();\n        \/\/ \u30e6\u30fc\u30b6\u30fc\u4f5c\u6210\u30ed\u30b8\u30c3\u30af\n        disconnect();\n    }\n\n    public void sendEmail(User user) {\n        \/\/ \u30e1\u30fc\u30eb\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\n    }\n}\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u8cac\u4efb\u3092\u5206\u5272\npublic class UserRepository {\n    private DatabaseConnection connection;\n\n    public UserRepository(DatabaseConnection connection) {\n        this.connection = connection;\n    }\n\n    public void createUser(User user) {\n        connection.connect();\n        \/\/ \u30e6\u30fc\u30b6\u30fc\u4f5c\u6210\u30ed\u30b8\u30c3\u30af\n        connection.disconnect();\n    }\n}\n\npublic class EmailService {\n    public void sendEmail(User user) {\n        \/\/ \u30e1\u30fc\u30eb\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-112\">\n<h4 class=\"wp-block-heading\" id=\"i-35\">2. \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5206\u96e2\u306e\u539f\u5247\u3092\u9069\u7528<\/h4>\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=\"\">\/\/ \u5927\u304d\u3059\u304e\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface UserService {\n    User createUser(UserData data);\n    void updateUser(User user);\n    void deleteUser(User user);\n    void sendWelcomeEmail(User user);\n    void generateReport(User user);\n}\n\n\/\/ \u5206\u5272\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\npublic interface UserCrudOperations {\n    User createUser(UserData data);\n    void updateUser(User user);\n    void deleteUser(User user);\n}\n\npublic interface UserNotificationService {\n    void sendWelcomeEmail(User user);\n}\n\npublic interface UserReportService {\n    void generateReport(User user);\n}\n\n\/\/ \u5fc5\u8981\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u307f\u3092\u5b9f\u88c5\npublic class UserManager implements UserCrudOperations, UserNotificationService {\n    \/\/ \u5fc5\u8981\u306a\u6a5f\u80fd\u306e\u307f\u3092\u5b9f\u88c5\n}<\/pre>\n\n\n<div id=\"sgb-css-id-113\">\n<h3 class=\"wp-block-heading\" id=\"i-36\">5.3 \u7d99\u627f\u3092\u4f7f\u3063\u305f\u8a2d\u8a08\u306e\u30ec\u30d3\u30e5\u30fc\u30dd\u30a4\u30f3\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-114\">\n<h4 class=\"wp-block-heading\" id=\"i-37\">1. \u7d99\u627f\u306e\u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h4>\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=\"\">\/\/ \u30ec\u30d3\u30e5\u30fc\u5bfe\u8c61\u306e\u4f8b\npublic class ElectronicDevice {\n    protected boolean isOn;\n    protected int volume;\n\n    public void turnOn() {\n        isOn = true;\n    }\n\n    public void turnOff() {\n        isOn = false;\n    }\n}\n\npublic class Television extends ElectronicDevice {\n    private int channel;\n\n    public void changeChannel(int newChannel) {\n        if (isOn) {  \/\/ \u89aa\u30af\u30e9\u30b9\u306e\u72b6\u614b\u3092\u9069\u5207\u306b\u4f7f\u7528\n            this.channel = newChannel;\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-115\">\n<h4 class=\"wp-block-heading\" id=\"i-38\">\u30ec\u30d3\u30e5\u30fc\u30dd\u30a4\u30f3\u30c8<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-116\">\n<p>\u30001. IS-A\u95a2\u4fc2\u306e\u78ba\u8a8d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-117\">\n<p>\u3000\u3000\u25cf \u30b5\u30d6\u30af\u30e9\u30b9\u306f\u672c\u5f53\u306b\u89aa\u30af\u30e9\u30b9\u306e\u7279\u6b8a\u5316\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-118\">\n<p>\u3000\u3000\u25cf \u30b5\u30d6\u30af\u30e9\u30b9\u306f\u89aa\u30af\u30e9\u30b9\u306e\u4ee3\u308f\u308a\u306b\u4f7f\u7528\u3067\u304d\u308b\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-119\">\n<p>\u30002. \u30ab\u30d7\u30bb\u30eb\u5316\u306e\u78ba\u8a8d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-120\">\n<p>\u3000\u3000\u25cf protected \u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u9069\u5207\u306b\u4fdd\u8b77\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-121\">\n<p>\u3000\u3000\u25cf \u89aa\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u8a73\u7d30\u3078\u306e\u4f9d\u5b58\u306f\u6700\u5c0f\u9650\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-122\">\n<p>\u30003. \u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-123\">\n<p>\u3000\u3000\u25cf @Override \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u9069\u5207\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-124\">\n<p>\u3000\u3000\u25cf \u5951\u7d04\uff08\u4e8b\u524d\u6761\u4ef6\u30fb\u4e8b\u5f8c\u6761\u4ef6\uff09\u306f\u5b88\u3089\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-125\">\n<h4 class=\"wp-block-heading\" id=\"i-39\">2. \u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8<\/h4>\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=\"\">## \u7d99\u627f\u8a2d\u8a08\u30ec\u30d3\u30e5\u30fc\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\n\n### \u57fa\u672c\u8a2d\u8a08\n- [ ] \u7d99\u627f\u306e\u6df1\u3055\u306f3\u968e\u5c64\u4ee5\u5185\u306b\u53ce\u307e\u3063\u3066\u3044\u308b\u304b\n- [ ] \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u9069\u5207\u306b\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\n- [ ] \u62bd\u8c61\u30af\u30e9\u30b9\u306e\u4f7f\u7528\u306f\u9069\u5207\u304b\n\n### \u30b3\u30fc\u30c9\u306e\u54c1\u8cea\n- [ ] DRY\u539f\u5247\u306f\u5b88\u3089\u308c\u3066\u3044\u308b\u304b\n- [ ] \u30e1\u30bd\u30c3\u30c9\u306e\u53ef\u8996\u6027\u306f\u9069\u5207\u304b\n- [ ] \u547d\u540d\u306f\u610f\u56f3\u3092\u9069\u5207\u306b\u8868\u73fe\u3057\u3066\u3044\u308b\u304b\n\n### \u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\n- [ ] \u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306f\u66f8\u304d\u3084\u3059\u3044\u8a2d\u8a08\u304b\n- [ ] \u30e2\u30c3\u30af\/\u30b9\u30bf\u30d6\u306e\u4f5c\u6210\u306f\u5bb9\u6613\u304b\n- [ ] \u30c6\u30b9\u30c8\u30b7\u30ca\u30ea\u30aa\u306f\u7db2\u7f85\u7684\u304b\n\n### \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\n- [ ] \u5c06\u6765\u306e\u62e1\u5f35\u6027\u306f\u78ba\u4fdd\u3055\u308c\u3066\u3044\u308b\u304b\n- [ ] \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u5341\u5206\u304b\n- [ ] \u6280\u8853\u7684\u8ca0\u50b5\u306e\u84c4\u7a4d\u306f\u306a\u3044\u304b<\/pre>\n\n\n<div id=\"sgb-css-id-126\">\n<h4 class=\"wp-block-heading\" id=\"i-40\">3. \u30ec\u30d3\u30e5\u30fc\u6642\u306e\u63a8\u5968\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-127\">\n<p>\u30001. \u7d99\u627f\u306e\u4ee3\u66ff\u6848\u306e\u691c\u8a0e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-128\">\n<p>\u3000\u3000\u25cf \u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-129\">\n<p>\u3000\u3000\u25cf \u30c7\u30ea\u30b2\u30fc\u30b7\u30e7\u30f3<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-130\">\n<p>\u3000\u3000\u25cf \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-131\">\n<p>\u30002. \u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u306e\u78ba\u8a8d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-132\">\n<p>\u3000\u3000\u25cf \u5909\u66f4\u306e\u5f71\u97ff\u7bc4\u56f2<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-133\">\n<p>\u3000\u3000\u25cf \u30c6\u30b9\u30c8\u306e\u5bb9\u6613\u3055<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-134\">\n<p>\u3000\u3000\u25cf \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u5145\u5b9f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-135\">\n<p>\u30003. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-136\">\n<p>\u3000\u3000\u25cf \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-137\">\n<p>\u3000\u3000\u25cf \u5b9f\u884c\u6642\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/p>\n<\/div>\n\n\n<p>\u3000\u3000\u25cf \u521d\u671f\u5316\u30b3\u30b9\u30c8<\/p>\n\n\n<div id=\"sgb-css-id-138\">\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u30c6\u30b9\u30c8\u304c\u5bb9\u6613\u306a\u7d99\u627f\u8a2d\u8a08\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u5b9a\u671f\u7684\u306a\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3092\u901a\u3058\u3066\u3001\u8a2d\u8a08\u306e\u54c1\u8cea\u3092\u7dad\u6301\u30fb\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-139\">\n<h2 class=\"wp-block-heading\" id=\"i-41\">\uff16\uff0e\u767a\u5c55\u7684\u306a\u7d99\u627f\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-140\">\n<h3 class=\"wp-block-heading\" id=\"i-42\">6.1 \u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3068\u7d99\u627f\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-141\">\n<p>\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3068\u7d99\u627f\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u578b\u5b89\u5168\u6027\u3068\u518d\u5229\u7528\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\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=\"\">\/\/ \u57fa\u672c\u7684\u306a\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u7d99\u627f\npublic abstract class BaseRepository&lt;T&gt; {\n    protected List&lt;T&gt; items = new ArrayList&lt;&gt;();\n\n    public void add(T item) {\n        items.add(item);\n    }\n\n    public List&lt;T&gt; findAll() {\n        return new ArrayList&lt;&gt;(items);\n    }\n\n    \/\/ \u30b5\u30d6\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\u3059\u308b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\n    protected abstract boolean matches(T item, String criteria);\n\n    public List&lt;T&gt; findByCriteria(String criteria) {\n        return items.stream()\n            .filter(item -&gt; matches(item, criteria))\n            .collect(Collectors.toList());\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\npublic class UserRepository extends BaseRepository&lt;User&gt; {\n    @Override\n    protected boolean matches(User user, String criteria) {\n        return user.getName().contains(criteria) ||\n               user.getEmail().contains(criteria);\n    }\n}\n\n\/\/ \u5883\u754c\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u305f\u4f8b\npublic abstract class ComparableRepository&lt;T extends Comparable&lt;T&gt;&gt; {\n    protected List&lt;T&gt; items = new ArrayList&lt;&gt;();\n\n    public void addSorted(T item) {\n        items.add(item);\n        Collections.sort(items);\n    }\n\n    public T findMax() {\n        return Collections.max(items);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-142\">\n<h3 class=\"wp-block-heading\" id=\"i-43\">6.2 \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3057\u305f\u7d99\u627f\u306e\u62e1\u5f35<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-143\">\n<p>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u7d99\u627f\u95a2\u4fc2\u306b\u3042\u308b\u30af\u30e9\u30b9\u306e\u632f\u308b\u821e\u3044\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\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=\"\">\/\/ \u30ab\u30b9\u30bf\u30e0\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u5b9a\u7fa9\n@Retention(RetentionPolicy.RUNTIME)\n@Target(ElementType.TYPE)\npublic @interface EntityTable {\n    String name();\n    String schema() default \"public\";\n}\n\n@Retention(RetentionPolicy.RUNTIME)\n@Target(ElementType.METHOD)\npublic @interface Cacheable {\n    int timeToLiveSeconds() default 300;\n}\n\n\/\/ \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u305f\u57fa\u5e95\u30af\u30e9\u30b9\npublic abstract class BaseEntity {\n    @Id\n    protected Long id;\n\n    protected LocalDateTime createdAt;\n    protected LocalDateTime updatedAt;\n\n    @PrePersist\n    protected void onCreate() {\n        createdAt = LocalDateTime.now();\n        updatedAt = LocalDateTime.now();\n    }\n\n    @PreUpdate\n    protected void onUpdate() {\n        updatedAt = LocalDateTime.now();\n    }\n}\n\n\/\/ \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u88c5\u4f8b\n@EntityTable(name = \"users\", schema = \"app\")\npublic class User extends BaseEntity {\n    private String name;\n    private String email;\n\n    @Cacheable(timeToLiveSeconds = 600)\n    public String getDisplayName() {\n        return name + \" &lt;\" + email + \"&gt;\";\n    }\n}\n\n\/\/ \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u51e6\u7406\u306e\u5b9f\u88c5\npublic class EntityProcessor {\n    public String getTableName(Class&lt;?&gt; entityClass) {\n        EntityTable annotation = entityClass.getAnnotation(EntityTable.class);\n        if (annotation != null) {\n            return annotation.schema() + \".\" + annotation.name();\n        }\n        throw new IllegalArgumentException(\"Entity must be annotated with @EntityTable\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-144\">\n<h3 class=\"wp-block-heading\" id=\"i-44\">6.3 Spring Framework\u3067\u306e\u7d99\u627f\u6d3b\u7528\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-145\">\n<p>Spring Framework\u3067\u306f\u3001\u7d99\u627f\u3092\u6d3b\u7528\u3057\u3066\u69d8\u3005\u306a\u6a5f\u80fd\u3092\u5b9f\u73fe\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=\"\">\/\/ \u5171\u901a\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u6a5f\u80fd\u3092\u63d0\u4f9b\u3059\u308b\u57fa\u5e95\u30af\u30e9\u30b9\n@Slf4j\npublic abstract class BaseController&lt;T, ID&gt; {\n    @Autowired\n    protected JpaRepository&lt;T, ID&gt; repository;\n\n    @GetMapping\n    public ResponseEntity&lt;List&lt;T&gt;&gt; findAll() {\n        try {\n            List&lt;T&gt; items = repository.findAll();\n            return ResponseEntity.ok(items);\n        } catch (Exception e) {\n            log.error(\"Error fetching items\", e);\n            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();\n        }\n    }\n\n    @GetMapping(\"\/{id}\")\n    public ResponseEntity&lt;T&gt; findById(@PathVariable ID id) {\n        return repository.findById(id)\n            .map(ResponseEntity::ok)\n            .orElse(ResponseEntity.notFound().build());\n    }\n\n    @DeleteMapping(\"\/{id}\")\n    public ResponseEntity&lt;Void&gt; deleteById(@PathVariable ID id) {\n        if (repository.existsById(id)) {\n            repository.deleteById(id);\n            return ResponseEntity.noContent().build();\n        }\n        return ResponseEntity.notFound().build();\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u306e\u5b9f\u88c5\n@RestController\n@RequestMapping(\"\/api\/users\")\npublic class UserController extends BaseController&lt;User, Long&gt; {\n    @PostMapping\n    public ResponseEntity&lt;User&gt; createUser(@RequestBody @Valid User user) {\n        User savedUser = repository.save(user);\n        return ResponseEntity\n            .created(URI.create(\"\/api\/users\/\" + savedUser.getId()))\n            .body(savedUser);\n    }\n\n    @GetMapping(\"\/search\")\n    public ResponseEntity&lt;List&lt;User&gt;&gt; searchByEmail(@RequestParam String email) {\n        List&lt;User&gt; users = ((UserRepository) repository).findByEmailContaining(email);\n        return ResponseEntity.ok(users);\n    }\n}\n\n\/\/ \u30b5\u30fc\u30d3\u30b9\u5c64\u3067\u306e\u7d99\u627f\u6d3b\u7528\u4f8b\n@Service\n@Transactional\npublic abstract class BaseService&lt;T, ID&gt; {\n    @Autowired\n    protected JpaRepository&lt;T, ID&gt; repository;\n\n    @Cacheable(value = \"entities\", key = \"#id\")\n    public Optional&lt;T&gt; findById(ID id) {\n        return repository.findById(id);\n    }\n\n    @CachePut(value = \"entities\", key = \"#result.id\")\n    public T save(T entity) {\n        return repository.save(entity);\n    }\n\n    @CacheEvict(value = \"entities\", key = \"#id\")\n    public void deleteById(ID id) {\n        repository.deleteById(id);\n    }\n}\n\n\/\/ \u5177\u4f53\u7684\u306a\u30b5\u30fc\u30d3\u30b9\u306e\u5b9f\u88c5\n@Service\npublic class UserService extends BaseService&lt;User, Long&gt; {\n    @Autowired\n    private PasswordEncoder passwordEncoder;\n\n    @Override\n    public User save(User user) {\n        user.setPassword(passwordEncoder.encode(user.getPassword()));\n        return super.save(user);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-146\">\n<p>\u3053\u308c\u3089\u306e\u767a\u5c55\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u8907\u96d1\u306a\u7d99\u627f\u95a2\u4fc2\u306f\u907f\u3051\u3001\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-147\">\n<h2 class=\"wp-block-heading\" id=\"i-45\">\u307e\u3068\u3081<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-148\">\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001Java\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067\u5e45\u5e83\u304f\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u5b66\u3093\u3060\u5185\u5bb9\u3092\u5b9f\u8df5\u3059\u308b\u969b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u6574\u7406\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-149\">\n<h4 class=\"wp-block-heading\" id=\"i-46\">\u7d99\u627f\u8a2d\u8a08\u306e\u91cd\u8981\u30dd\u30a4\u30f3\u30c8<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-150\">\n<p>\u30001. <strong>\u7d99\u627f\u306e\u4f7f\u7528\u5224\u65ad<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-151\">\n<p>\u3000\u3000\u25cf IS-A\u95a2\u4fc2\u304c\u6210\u7acb\u3059\u308b\u5834\u5408\u306e\u307f\u7d99\u627f\u3092\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-152\">\n<p>\u3000\u3000\u25cf \u7d99\u627f\u306e\u6df1\u3055\u306f3\u968e\u5c64\u4ee5\u5185\u306b\u6291\u3048\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-153\">\n<p>\u3000\u3000\u25cf \u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u5834\u5408\u306e\u307f\u7d99\u627f\u3092\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-154\">\n<p>\u30002. <strong>\u8a2d\u8a08\u54c1\u8cea\u306e\u78ba\u4fdd<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-155\">\n<p>\u3000\u3000\u25cf LSP\u3092\u9075\u5b88\u3057\u305f\u7d99\u627f\u8a2d\u8a08<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-156\">\n<p>\u3000\u3000\u25cf \u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u69cb\u9020<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-157\">\n<p>\u3000\u3000\u25cf \u9069\u5207\u306a\u7c92\u5ea6\u3067\u306e\u8cac\u4efb\u5206\u5272<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-158\">\n<p>\u30003. <strong><strong>\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/strong><\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-159\">\n<p>\u3000\u3000\u25cf \u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-160\">\n<p>\u3000\u3000\u25cf \u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-161\">\n<p>\u3000\u3000\u25cf \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3057\u305f\u6a5f\u80fd\u62e1\u5f35<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-162\">\n<h4 class=\"wp-block-heading\" id=\"i-47\">\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u305f\u3081\u306b<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-163\">\n<p>\u3000\u7d99\u627f\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u53d6\u308a\u7d44\u307f\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-164\">\n<p>\u30001. \u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u7d99\u627f\u30d1\u30bf\u30fc\u30f3\u306e\u5206\u6790<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-165\">\n<p>\u30002. \u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u7df4\u7fd2<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-166\">\n<p>\u30003. \u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u7d99\u627f\u8a2d\u8a08\u306e\u8b70\u8ad6<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-167\">\n<p>\u30004. \u30c6\u30b9\u30c8\u99c6\u52d5\u958b\u767a\u3092\u901a\u3058\u305f\u7d99\u627f\u8a2d\u8a08\u306e\u6539\u5584<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-168\">\n<p>\u7d99\u627f\u306f\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305f\u539f\u5247\u3068\u30c6\u30af\u30cb\u30c3\u30af\u3092\u53c2\u8003\u306b\u3001\u3088\u308a\u826f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a2d\u8a08\u3092\u76ee\u6307\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-169\">\n<h4 class=\"wp-block-heading\" id=\"i-48\">\u53c2\u8003\u30ea\u30bd\u30fc\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-170\">\n<p>\u3000\u25cf Effective Java\uff08Joshua Bloch\u8457\uff09<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-171\">\n<p>\u3000\u25cf Clean Code\uff08Robert C. Martin\u8457\uff09<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-172\">\n<p>\u3000\u25cf Design Patterns\uff08Gang of Four\u8457\uff09<\/p>\n<\/div>\n\n\n<p>\u3000\u25cf Java\u8a00\u8a9e\u4ed5\u69d8<\/p>\n\n\n<div id=\"sgb-css-id-173\">\n<p>\u3053\u308c\u3089\u306e\u66f8\u7c4d\u3084\u30ea\u30bd\u30fc\u30b9\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u3067\u3001\u3055\u3089\u306b\u7406\u89e3\u3092\u6df1\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2971,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,72,66],"tags":[],"class_list":{"0":"post-693","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-java","8":"category-java-oop","9":"category-java-syntax"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/693","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=693"}],"version-history":[{"count":6,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/693\/revisions"}],"predecessor-version":[{"id":2973,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/693\/revisions\/2973"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/2971"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}