{"id":192,"date":"2024-10-01T13:45:23","date_gmt":"2024-10-01T04:45:23","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=192"},"modified":"2025-03-24T08:54:58","modified_gmt":"2025-03-23T23:54:58","slug":"%e3%80%8e%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91equals%e3%81%ae%e5%90%a6%e5%ae%9a%e3%82%92%e4%bd%bf%e3%81%84%e3%81%93%e3%81%aa%e3%81%995%e3%81%a4%e3%81%ae%e5%bf%85%e9%a0%88%e3%83%86%e3%82%af%e3%83%8b","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=192","title":{"rendered":"\u300e\u3010Java\u5165\u9580\u3011equals\u306e\u5426\u5b9a\u3092\u4f7f\u3044\u3053\u306a\u30595\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af &#8211; \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3082\u89e3\u8aac\u300f"},"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\">1. \u306f\u3058\u3081\u306b\uff1aJava\u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6bd4\u8f03\u3068\u7b49\u4fa1\u6027\u306e\u91cd\u8981\u6027<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">1.1 equals\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u3068\u5f79\u5272<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">1.2 \u7b49\u4fa1\u6027\u306e\u5426\u5b9a\u304c\u5fc5\u8981\u3068\u306a\u308b\u4e00\u822c\u7684\u306a\u30b7\u30ca\u30ea\u30aa<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">2. equals\u306e\u5426\u5b9a\u3092\u884c\u30465\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">2.1 \u300c!\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u57fa\u672c\u7684\u306a\u5426\u5b9a<\/a>      <\/li>      <li>        <a href=\"#i-5\">2.2 Objects.equals()\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u5b89\u5168\u306a\u6bd4\u8f03<\/a>      <\/li>      <li>        <a href=\"#i-6\">2.3 \u30ab\u30b9\u30bf\u30e0equals\u30e1\u30bd\u30c3\u30c9\u3067\u306e\u5426\u5b9a\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-7\">2.4 Stream API\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u6bd4\u8f03\u3068\u5426\u5b9a<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-8\">2.5 Optional\u3092\u5229\u7528\u3057\u305f\u5b89\u5168\u3067\u7c21\u6f54\u306a\u7b49\u4fa1\u6027\u306e\u5426\u5b9a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-9\">3. equals\u306e\u5426\u5b9a\u306b\u304a\u3051\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-10\">3.1 \u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u3092\u907f\u3051\u308b\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-11\">3.2 \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3092\u6d3b\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/a>      <\/li>      <li>        <a href=\"#i-12\">3.3 \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5229\u7528\u3057\u305f\u6bd4\u8f03\u7d50\u679c\u306e\u518d\u5229\u7528<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u4e00\u822c\u7684\u306a\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-14\">4. \u7d50\u8ad6\uff1aequals\u306e\u5426\u5b9a\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306b<\/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\">1. \u306f\u3058\u3081\u306b\uff1aJava\u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6bd4\u8f03\u3068\u7b49\u4fa1\u6027\u306e\u91cd\u8981\u6027<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-2\">\n<p>Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u3068\u7b49\u4fa1\u6027\u306e\u5224\u65ad\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u7279\u306b\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u5426\u5b9a\u306e\u4f7f\u7528\u306f\u3001\u30c7\u30fc\u30bf\u306e\u4e00\u8cab\u6027\u7dad\u6301\u3084\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306e\u5b9f\u88c5\u306b\u304a\u3044\u3066\u6b20\u304b\u305b\u306a\u3044\u8981\u7d20\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306e5\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af\u3068\u3001\u305d\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-3\">\n<p>\u307e\u305a\u3001Java\u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6bd4\u8f03\u306e\u57fa\u672c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u307e\u3057\u3087\u3046\u3002Java\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u304c<code>Object<\/code>\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u3066\u304a\u308a\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u3053\u306e<code>Object<\/code>\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5b9f\u88c5\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u6bd4\u8f03\uff08\u3064\u307e\u308a\u3001\u540c\u3058\u30e1\u30e2\u30ea\u4f4d\u7f6e\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\uff09\u304c\u884c\u308f\u308c\u307e\u3059\u304c\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u958b\u767a\u8005\u306f\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u306b\u57fa\u3065\u3044\u305f\u6bd4\u8f03\u3092\u884c\u3046\u3088\u3046\u306b\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-4\">\n<h3 class=\"wp-block-heading\" id=\"i-1\">1.1 equals\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u3068\u5f79\u5272<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-5\">\n<p><code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u4e3b\u306a\u5f79\u5272\u306f\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u4fa1\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u7b49\u4fa1\u6027\u306e\u5b9a\u7fa9\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u5909\u308f\u308a\u307e\u3059\u304c\u3001\u4e00\u822c\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u91cd\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-9\">\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\">\u7b49\u4fa1\u6027\u5224\u65ad<\/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-6\">\n<li><strong>\u30c7\u30fc\u30bf\u306e\u4e00\u8cab\u6027\u7dad\u6301<\/strong>\uff1a \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3084\u5185\u90e8\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3001\u91cd\u8907\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u9632\u3050<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-7\">\n<li><strong>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c<\/strong>\uff1a <code>List<\/code>\u3001<code>Set<\/code>\u3001<code>Map<\/code>\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306e\u8981\u7d20\u306e\u691c\u7d22\u3084\u524a\u9664<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-8\">\n<li><strong>\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af<\/strong>\uff1a \u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u3084\u51e6\u7406<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-10\">\n<p>\u307e\u305f\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306f<code>hashCode<\/code>\u30e1\u30bd\u30c3\u30c9\u3068\u5bc6\u63a5\u306a\u95a2\u4fc2\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u4e00\u8cab\u6027\u3092\u6301\u3063\u3066\u5b9f\u88c5\u3055\u308c\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u7279\u306b\u30cf\u30c3\u30b7\u30e5\u30d9\u30fc\u30b9\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\uff08<code>HashMap<\/code>\u3001<code>HashSet<\/code>\u306a\u3069\uff09\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-11\">\n<h3 class=\"wp-block-heading\" id=\"i-2\">1.2 \u7b49\u4fa1\u6027\u306e\u5426\u5b9a\u304c\u5fc5\u8981\u3068\u306a\u308b\u4e00\u822c\u7684\u306a\u30b7\u30ca\u30ea\u30aa<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-12\">\n<p><code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u3001\u3064\u307e\u308a\u300c\u7b49\u3057\u304f\u306a\u3044\u300d\u3068\u3044\u3046\u5224\u65ad\u306f\u3001\u69d8\u3005\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b7\u30ca\u30ea\u30aa\u3067\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e00\u822c\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-17\">\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\">\u7b49\u4fa1\u6027\u306e\u5426\u5b9a<\/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-13\">\n<li><strong>\u91cd\u8907\u30c7\u30fc\u30bf\u306e\u9664\u5916<\/strong>\uff1a \u30e6\u30cb\u30fc\u30af\u306a\u8981\u7d20\u306e\u307f\u3092\u542b\u3080\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u3001\u65e2\u5b58\u306e\u8981\u7d20\u3068\u7b49\u3057\u304f\u306a\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u307f\u3092\u8ffd\u52a0\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-14\">\n<li><strong>\u6761\u4ef6\u5206\u5c90<\/strong>\uff1a \u7279\u5b9a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u7b49\u3057\u304f\u306a\u3044\u5834\u5408\u306b\u5225\u306e\u51e6\u7406\u3092\u884c\u3046<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-15\">\n<li><strong>\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u64cd\u4f5c<\/strong>\uff1a \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u8981\u7d20\u3092\u9664\u5916\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-16\">\n<li><strong>\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af<\/strong>\uff1a \u671f\u5f85\u3055\u308c\u308b\u5024\u3068\u5b9f\u969b\u306e\u5024\u304c\u7570\u306a\u308b\u5834\u5408\u306b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3059\u308b<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-18\">\n<p>\u3053\u308c\u3089\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u660e\u78ba\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-19\">\n<p>\u4ee5\u964d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001<code>equals<\/code>\u306e\u5426\u5b9a\u3092\u884c\u30465\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u5229\u70b9\u3068\u4f7f\u7528\u5834\u9762\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u89b3\u70b9\u304b\u3089\u3082\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u63a2\u3063\u3066\u3044\u304d\u307e\u3059\u3002Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30b9\u30ad\u30eb\u3092\u5411\u4e0a\u3055\u305b\u3001\u3088\u308a\u6d17\u7df4\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u77e5\u8b58\u3092\u8eab\u306b\u3064\u3051\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-20\">\n<h2 class=\"wp-block-heading\" id=\"i-3\">2. equals\u306e\u5426\u5b9a\u3092\u884c\u30465\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-21\">\n<p>Java\u3067\u306e<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u306f\u3001\u69d8\u3005\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u5fc5\u8981\u3068\u306a\u308b\u91cd\u8981\u306a\u64cd\u4f5c\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u52b9\u679c\u7684\u304b\u3064\u5b89\u5168\u306b<code>equals<\/code>\u306e\u5426\u5b9a\u3092\u884c\u3046\u305f\u3081\u306e5\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-22\">\n<h3 class=\"wp-block-heading\" id=\"i-4\">2.1 \u300c!\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u57fa\u672c\u7684\u306a\u5426\u5b9a<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-23\">\n<p>\u6700\u3082\u57fa\u672c\u7684\u306a<code>equals<\/code>\u306e\u5426\u5b9a\u65b9\u6cd5\u306f\u3001\u5358\u7d14\u306b\u300c!\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\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 boolean areNotEqual(Object obj1, Object obj2) {\n    return !obj1.equals(obj2); \/\/ \u57fa\u672c\u7684\u306a\u5426\u5b9a\n}<\/pre>\n\n\n<div id=\"sgb-css-id-24\">\n<p>\u3053\u306e\u65b9\u6cd5\u306f\u76f4\u611f\u7684\u3067\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u304c\u3001<code>obj1<\/code>\u304c<code>null<\/code>\u306e\u5834\u5408\u306b<code>NullPointerException<\/code>\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6b21\u306e\u3088\u3046\u306b<code>null<\/code>\u30c1\u30a7\u30c3\u30af\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\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 boolean areNotEqual(Object obj1, Object obj2) {\n    if (obj1 == null) {\n        return obj2 != null; \/\/ obj1\u304cnull\u306e\u5834\u5408\u3001obj2\u304cnull\u3067\u306a\u3051\u308c\u3070true\n    }\n    return !obj1.equals(obj2);\n}<\/pre>\n\n\n<div id=\"sgb-css-id-25\">\n<p>\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u6bd4\u8f03\u3084<code>null<\/code>\u3067\u306a\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-26\">\n<h3 class=\"wp-block-heading\" id=\"i-5\">2.2 Objects.equals()\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u5b89\u5168\u306a\u6bd4\u8f03<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-27\">\n<p>Java 7\u4ee5\u964d\u3067\u306f\u3001<code>Objects.equals()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u306b\u6bd4\u8f03\u3092\u884c\u3046\u3053\u3068\u304c\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=\"\">import java.util.Objects;\n\npublic boolean areNotEqual(Object obj1, Object obj2) {\n    return !Objects.equals(obj1, obj2); \/\/ Null\u5b89\u5168\u306a\u6bd4\u8f03\n}<\/pre>\n\n\n<div id=\"sgb-css-id-28\">\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5185\u90e8\u3067<code>null<\/code>\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u305f\u3081\u3001<code>NullPointerException<\/code>\u306e\u30ea\u30b9\u30af\u304c\u306a\u304f\u3001\u30b3\u30fc\u30c9\u3082\u3088\u308a\u7c21\u6f54\u306b\u306a\u308a\u307e\u3059\u3002Java 7\u4ee5\u964d\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u3053\u306e\u65b9\u6cd5\u3092\u7a4d\u6975\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-29\">\n<h3 class=\"wp-block-heading\" id=\"i-6\">2.3 \u30ab\u30b9\u30bf\u30e0equals\u30e1\u30bd\u30c3\u30c9\u3067\u306e\u5426\u5b9a\u306e\u5b9f\u88c5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-30\">\n<p>\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u69cb\u9020\u3084\u7279\u6b8a\u306a\u6bd4\u8f03\u30ed\u30b8\u30c3\u30af\u304c\u5fc5\u8981\u306a\u5834\u5408\u3001\u30ab\u30b9\u30bf\u30e0\u306e<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3001\u305d\u306e\u4e2d\u3067\u5426\u5b9a\u306e\u30ed\u30b8\u30c3\u30af\u3092\u7d44\u307f\u8fbc\u3080\u3053\u3068\u304c\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 class ComplexObject {\n    private int id;\n    private String name;\n\n    @Override\n    public boolean equals(Object obj) {\n        if (this == obj) return true;\n        if (obj == null || getClass() != obj.getClass()) return false;\n        ComplexObject that = (ComplexObject) obj;\n        return id == that.id &amp;&amp; Objects.equals(name, that.name);\n    }\n\n    public boolean notEquals(Object obj) {\n        return !equals(obj); \/\/ \u30ab\u30b9\u30bf\u30e0equals\u306e\u5426\u5b9a\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-31\">\n<p>\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u5229\u70b9\u306f\u3001\u30af\u30e9\u30b9\u56fa\u6709\u306e\u8907\u96d1\u306a\u7b49\u4fa1\u6027\u30ed\u30b8\u30c3\u30af\u3092\u4e00\u7b87\u6240\u3067\u7ba1\u7406\u3067\u304d\u308b\u3053\u3068\u3067\u3059\u3002\u305f\u3060\u3057\u3001<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u969b\u306f\u3001\u5fc5\u305a<code>hashCode<\/code>\u30e1\u30bd\u30c3\u30c9\u3082\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-32\">\n<h3 class=\"wp-block-heading\" id=\"i-7\">2.4 Stream API\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u6bd4\u8f03\u3068\u5426\u5b9a<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-33\">\n<p>Java 8\u4ee5\u964d\u3067\u306f\u3001Stream API\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u3092\u52b9\u7387\u7684\u306b\u6bd4\u8f03\u3057\u3001\u5426\u5b9a\u6761\u4ef6\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\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=\"\">import java.util.List;\nimport java.util.stream.Collectors;\n\npublic List&lt;String&gt; filterNotEqual(List&lt;String&gt; list, String target) {\n    return list.stream()\n               .filter(s -&gt; !s.equals(target)) \/\/ target\u3068\u7b49\u3057\u304f\u306a\u3044\u8981\u7d20\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n               .collect(Collectors.toList());\n}<\/pre>\n\n\n<div id=\"sgb-css-id-34\">\n<p>\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u3084\u3001\u8907\u6570\u306e\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u7279\u306b\u6709\u7528\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-35\">\n<h3 class=\"wp-block-heading\" id=\"i-8\">2.5 Optional\u3092\u5229\u7528\u3057\u305f\u5b89\u5168\u3067\u7c21\u6f54\u306a\u7b49\u4fa1\u6027\u306e\u5426\u5b9a<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-36\">\n<p>Java 8\u3067\u5c0e\u5165\u3055\u308c\u305f<code>Optional&lt;T&gt;<\/code>\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001<code>null<\/code>\u5b89\u5168\u3067\u7c21\u6f54\u306a\u7b49\u4fa1\u6027\u306e\u5426\u5b9a\u3092\u8868\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=\"\">import java.util.Optional;\n\npublic boolean isNotEqualAndPresent(String str1, String str2) {\n    return Optional.ofNullable(str1)\n                   .filter(s -&gt; !s.equals(str2))\n                   .isPresent();\n}<\/pre>\n\n\n<div id=\"sgb-css-id-37\">\n<p>\u3053\u306e\u65b9\u6cd5\u306f\u3001<code>null<\/code>\u30c1\u30a7\u30c3\u30af\u3068\u7b49\u4fa1\u6027\u306e\u5426\u5b9a\u30921\u884c\u3067\u8868\u73fe\u3067\u304d\u3001\u7279\u306b\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3092\u63a1\u7528\u3057\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u6709\u7528\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u904e\u5ea6\u306b\u4f7f\u7528\u3059\u308b\u3068\u53ef\u8aad\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u9069\u5207\u306a\u5834\u9762\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-38\">\n<p>\u3053\u308c\u3089\u306e5\u3064\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u72b6\u6cc1\u3084\u8981\u4ef6\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u6027\u8cea\u3001Java\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u306a\u3069\u3092\u8003\u616e\u3057\u3066\u3001\u6700\u9069\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-39\">\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-40\">\n<h2 class=\"wp-block-heading\" id=\"i-9\">3. equals\u306e\u5426\u5b9a\u306b\u304a\u3051\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-41\">\n<p><code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u91cd\u8981\u3067\u3059\u304c\u3001\u7279\u306b\u5927\u898f\u6a21\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u9ad8\u8ca0\u8377\u306a\u74b0\u5883\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\u3082\u540c\u69d8\u306b\u91cd\u8981\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001<code>equals<\/code>\u306e\u5426\u5b9a\u64cd\u4f5c\u306b\u304a\u3051\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e3\u3064\u306e\u4e3b\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5fdc\u7b54\u6027\u3068\u52b9\u7387\u6027\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-42\">\n<h3 class=\"wp-block-heading\" id=\"i-10\">3.1 \u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u3092\u907f\u3051\u308b\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-43\">\n<p><code>equals<\/code>\u306e\u5426\u5b9a\u51e6\u7406\u4e2d\u306b\u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u306a\u3044\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u524a\u6e1b\u3057\u3001\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\uff08GC\uff09\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\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=\"\">\/\/ \u6700\u9069\u5316\u524d\npublic boolean isNotEqualIgnoreCase(String str1, String str2) {\n    return !str1.toLowerCase().equals(str2.toLowerCase()); \/\/ \u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\n}\n\n\/\/ \u6700\u9069\u5316\u5f8c\npublic boolean isNotEqualIgnoreCase(String str1, String str2) {\n    return !str1.equalsIgnoreCase(str2); \/\/ \u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u306a\u3044\n}<\/pre>\n\n\n<div id=\"sgb-css-id-47\">\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\">\u4e3b\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af<\/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-44\">\n<li>\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u4f7f\u7528\uff1a\u53ef\u80fd\u306a\u9650\u308a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306e\u4ee3\u308f\u308a\u306b\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092\u4f7f\u7528\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-45\">\n<li><code>StringBuilder<\/code>\u306e\u9069\u5207\u306a\u4f7f\u7528\uff1a\u6587\u5b57\u5217\u9023\u7d50\u304c\u591a\u3044\u5834\u5408\u306f<code>StringBuilder<\/code>\u3092\u4f7f\u7528\u3057\u3001\u521d\u671f\u5bb9\u91cf\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-46\">\n<li>\u4e0d\u5909\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6d3b\u7528\uff1a\u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u306a\u3044\u30c7\u30fc\u30bf\u306b\u306f\u4e0d\u5909\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-48\">\n<p><strong>\u52b9\u679c\uff1a<\/strong> \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b\u3001GC\u8ca0\u8377\u306e\u8efd\u6e1b\u3001\u51e6\u7406\u901f\u5ea6\u306e\u5411\u4e0a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-49\">\n<p><strong>\u9069\u7528\u30b7\u30ca\u30ea\u30aa\uff1a<\/strong> \u5927\u91cf\u306e\u30c7\u30fc\u30bf\u51e6\u7406\u3001\u30ea\u30bd\u30fc\u30b9\u304c\u5236\u9650\u3055\u308c\u305f\u74b0\u5883\uff08\u30e2\u30d0\u30a4\u30eb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306a\u3069\uff09<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-50\">\n<h3 class=\"wp-block-heading\" id=\"i-11\">3.2 \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3092\u6d3b\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-51\">\n<p>\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u306b\u65e9\u671f\u306b\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u629c\u3051\u308b\u3053\u3068\u3067\u3001\u4e0d\u8981\u306a\u51e6\u7406\u3092\u524a\u6e1b\u3057\u3001\u5168\u4f53\u7684\u306a\u51e6\u7406\u6642\u9593\u3092\u77ed\u7e2e\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=\"\">\/\/ \u6700\u9069\u5316\u524d\npublic boolean areNotEqual(Object obj1, Object obj2) {\n    boolean result = true;\n    if (obj1 != null &amp;&amp; obj2 != null) {\n        if (obj1.getClass() == obj2.getClass()) {\n            result = !obj1.equals(obj2);\n        }\n    }\n    return result;\n}\n\n\/\/ \u6700\u9069\u5316\u5f8c\npublic boolean areNotEqual(Object obj1, Object obj2) {\n    if (obj1 == null || obj2 == null) {\n        return true; \/\/ \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\n    }\n    if (obj1.getClass() != obj2.getClass()) {\n        return true; \/\/ \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\n    }\n    return !obj1.equals(obj2);\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\">\u4e3b\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af<\/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-52\">\n<li>null\u30c1\u30a7\u30c3\u30af\u306e\u65e9\u671f\u5b9f\u884c<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-53\">\n<li>\u578b\u30c1\u30a7\u30c3\u30af\u306e\u65e9\u671f\u5b9f\u884c<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-54\">\n<li>\u7c21\u5358\u306a\u6761\u4ef6\u30c1\u30a7\u30c3\u30af\u306e\u512a\u5148<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-56\">\n<p><strong>\u52b9\u679c\uff1a<\/strong> \u4e0d\u8981\u306a\u51e6\u7406\u306e\u524a\u6e1b\u3001\u51e6\u7406\u6642\u9593\u306e\u77ed\u7e2e\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u5411\u4e0a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-57\">\n<p><strong>\u9069\u7528\u30b7\u30ca\u30ea\u30aa\uff1a<\/strong> \u8907\u96d1\u306a\u6bd4\u8f03\u30ed\u30b8\u30c3\u30af\u3001\u591a\u6bb5\u968e\u306e\u6761\u4ef6\u30c1\u30a7\u30c3\u30af<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-58\">\n<h3 class=\"wp-block-heading\" id=\"i-12\">3.3 \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5229\u7528\u3057\u305f\u6bd4\u8f03\u7d50\u679c\u306e\u518d\u5229\u7528<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-59\">\n<p>\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u6bd4\u8f03\u306e\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u518d\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u91cd\u8907\u8a08\u7b97\u3092\u907f\u3051\u3001\u51e6\u7406\u6642\u9593\u3092\u5927\u5e45\u306b\u77ed\u7e2e\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=\"\">import java.util.WeakHashMap;\n\npublic class CachedComparator {\n    private final WeakHashMap&lt;ComparisonPair, Boolean&gt; cache = new WeakHashMap&lt;&gt;();\n\n    public boolean areNotEqual(Object obj1, Object obj2) {\n        ComparisonPair pair = new ComparisonPair(obj1, obj2);\n        return cache.computeIfAbsent(pair, p -&gt; !p.obj1.equals(p.obj2));\n    }\n\n    private static class ComparisonPair {\n        final Object obj1;\n        final Object obj2;\n\n        ComparisonPair(Object obj1, Object obj2) {\n            this.obj1 = obj1;\n            this.obj2 = obj2;\n        }\n\n        @Override\n        public int hashCode() {\n            return obj1.hashCode() ^ obj2.hashCode();\n        }\n\n        @Override\n        public boolean equals(Object obj) {\n            if (!(obj instanceof ComparisonPair)) return false;\n            ComparisonPair other = (ComparisonPair) obj;\n            return (obj1 == other.obj1 &amp;&amp; obj2 == other.obj2) || (obj1 == other.obj2 &amp;&amp; obj2 == other.obj1);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-63\">\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\">\u4e3b\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af<\/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-60\">\n<li>\u30ed\u30fc\u30ab\u30eb\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-61\">\n<li><code>WeakHashMap<\/code>\u306e\u4f7f\u7528\uff08\u30e1\u30e2\u30ea\u7ba1\u7406\u306b\u914d\u616e\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-62\">\n<li>Guava\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6d3b\u7528\uff08\u3088\u308a\u9ad8\u5ea6\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u304c\u5fc5\u8981\u306a\u5834\u5408\uff09<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-64\">\n<p><strong>\u52b9\u679c\uff1a<\/strong> \u91cd\u8907\u8a08\u7b97\u306e\u524a\u6e1b\u3001\u51e6\u7406\u6642\u9593\u306e\u5927\u5e45\u77ed\u7e2e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-65\">\n<p><strong>\u9069\u7528\u30b7\u30ca\u30ea\u30aa\uff1a<\/strong> \u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u304c\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u5834\u5408\u3001\u8a08\u7b97\u30b3\u30b9\u30c8\u306e\u9ad8\u3044\u6bd4\u8f03\u64cd\u4f5c<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-66\">\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u4e00\u822c\u7684\u306a\u6ce8\u610f\u70b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-70\">\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\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u6ce8\u610f\u70b9<\/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-67\">\n<li>\u904e\u5ea6\u306a\u6700\u9069\u5316\u3092\u907f\u3051\u308b\uff1a\u6700\u9069\u5316\u306f\u5fc5\u8981\u306a\u7b87\u6240\u306b\u306e\u307f\u9069\u7528\u3057\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3084\u4fdd\u5b88\u6027\u3092\u640d\u306a\u308f\u306a\u3044\u3088\u3046\u306b\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-68\">\n<li>\u9069\u5207\u306a\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u3068\u30d9\u30f3\u30c1\u30de\u30fc\u30ad\u30f3\u30b0\u306e\u5b9f\u65bd\uff1a\u6700\u9069\u5316\u306e\u52b9\u679c\u3092\u5ba2\u89b3\u7684\u306b\u6e2c\u5b9a\u3057\u3001\u672c\u5f53\u306b\u52b9\u679c\u304c\u3042\u308b\u7b87\u6240\u306b\u6ce8\u529b\u3059\u308b<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-69\">\n<li>\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u4fdd\u3064\uff1a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u540c\u6642\u306b\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3082\u8003\u616e\u3059\u308b<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-71\">\n<p>\u3053\u308c\u3089\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001<code>equals<\/code>\u306e\u5426\u5b9a\u64cd\u4f5c\u3092\u52b9\u7387\u7684\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u6700\u9069\u5316\u3092\u884c\u3046\u524d\u306b\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u6b63\u78ba\u306b\u628a\u63e1\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u9069\u5207\u306a\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u5b9f\u969b\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u304c\u5fc5\u8981\u306a\u7b87\u6240\u3092\u7279\u5b9a\u3057\u3001\u305d\u308c\u306b\u57fa\u3065\u3044\u3066\u6700\u9069\u5316\u3092\u884c\u3046\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-72\">\n<h2 class=\"wp-block-heading\" id=\"i-14\">4. \u7d50\u8ad6\uff1aequals\u306e\u5426\u5b9a\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306b<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-73\">\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001Java\u306b\u304a\u3051\u308b<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u306b\u3064\u3044\u3066\u3001\u305d\u306e\u91cd\u8981\u6027\u304b\u3089\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3001\u3055\u3089\u306b\u306f\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u307e\u3067\u3001\u5e45\u5e83\u304f\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u5b66\u3093\u3060\u5185\u5bb9\u3092\u7c21\u5358\u306b\u307e\u3068\u3081\u3001\u5b9f\u8df5\u7684\u306a\u5fdc\u7528\u306b\u5411\u3051\u305f\u30a2\u30c9\u30d0\u30a4\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-77\">\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\">\u4e3b\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-74\">\n<li><strong>\u57fa\u672c\u7684\u306a\u5426\u5b9a\u30c6\u30af\u30cb\u30c3\u30af<\/strong>\uff1a\u300c!\u300d\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\u304b\u3089\u3001<code>Objects.equals()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u5b89\u5168\u306a\u6bd4\u8f03\u307e\u3067\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3042\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-75\">\n<li><strong>\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af<\/strong>\uff1a\u30ab\u30b9\u30bf\u30e0<code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3001Stream API\u306e\u6d3b\u7528\u3001<code>Optional&lt;T&gt;<\/code>\u306e\u4f7f\u7528\u306a\u3069\u3001\u3088\u308a\u8907\u96d1\u306a\u30b7\u30ca\u30ea\u30aa\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u6280\u8853\u3092\u7fd2\u5f97\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3068\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-76\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/strong>\uff1a\u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u306e\u56de\u907f\u3001\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u306e\u6d3b\u7528\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5229\u7528\u306a\u3069\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5fdc\u7b54\u6027\u3068\u52b9\u7387\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-83\">\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\">\u5b9f\u8df5\u7684\u306a\u30a2\u30c9\u30d0\u30a4\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-78\">\n<li><strong>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u8003\u616e\u3059\u308b<\/strong>\uff1a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u3001\u5bfe\u8c61\u3068\u306a\u308b\u30c7\u30fc\u30bf\u306e\u7279\u6027\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8981\u6c42\u306a\u3069\u3092\u8003\u616e\u3057\u3001\u6700\u9069\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9078\u629e\u3059\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-79\">\n<li><strong>\u30c6\u30b9\u30c8\u306e\u91cd\u8981\u6027<\/strong>\uff1a<code>equals<\/code>\u306e\u5426\u5b9a\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306f\u3001\u69d8\u3005\u306a\u30b1\u30fc\u30b9\u3092\u60f3\u5b9a\u3057\u305f\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u4f5c\u6210\u3057\u3001\u6b63\u78ba\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-80\">\n<li><strong>\u7d99\u7d9a\u7684\u306a\u5b66\u7fd2<\/strong>\uff1aJava\u8a00\u8a9e\u3084\u95a2\u9023\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u9032\u5316\u306b\u4f34\u3044\u3001\u65b0\u3057\u3044\u30c6\u30af\u30cb\u30c3\u30af\u3084\u6700\u9069\u5316\u306e\u65b9\u6cd5\u304c\u767b\u5834\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u5e38\u306b\u6700\u65b0\u306e\u60c5\u5831\u3092\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7\u3057\u3001\u30b9\u30ad\u30eb\u3092\u78e8\u304d\u7d9a\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3042\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-81\">\n<li><strong>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u6d3b\u7528<\/strong>\uff1a<code>equals<\/code>\u306e\u5426\u5b9a\u306e\u5b9f\u88c5\u306b\u3064\u3044\u3066\u3001\u30c1\u30fc\u30e0\u30e1\u30f3\u30d0\u30fc\u3068\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3092\u901a\u3058\u3066\u3001\u3088\u308a\u826f\u3044\u5b9f\u88c5\u65b9\u6cd5\u3084\u6f5c\u5728\u7684\u306a\u554f\u984c\u70b9\u3092\u767a\u898b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-82\">\n<li><strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong>\uff1a\u7279\u306b\u8907\u96d1\u306a\u6bd4\u8f03\u30ed\u30b8\u30c3\u30af\u3084\u6700\u9069\u5316\u3092\u884c\u3063\u305f\u5834\u5408\u306f\u3001\u305d\u306e\u7406\u7531\u3084\u6ce8\u610f\u70b9\u3092\u30b3\u30e1\u30f3\u30c8\u3084\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3068\u3057\u3066\u6b8b\u3059\u3053\u3068\u3067\u3001\u5c06\u6765\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3092\u5bb9\u6613\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/div><\/ol>\n<\/div><\/div>\n<\/div>\n\n\n<p><code>equals<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u5426\u5b9a\u306f\u3001\u4e00\u898b\u5358\u7d14\u306b\u898b\u3048\u3066\u5965\u304c\u6df1\u3044\u984c\u6750\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u6d3b\u7528\u3057\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u6700\u9069\u306a\u5b9f\u88c5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u52b9\u7387\u7684\u306aJava\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u958b\u767a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u5e38\u306b\u5b66\u3073\u7d9a\u3051\u3001\u5b9f\u8df5\u3092\u91cd\u306d\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u30af\u30ea\u30fc\u30f3\u3067\u9ad8\u6027\u80fd\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u80fd\u529b\u3092\u78e8\u3044\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\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":3082,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,66,73],"tags":[],"class_list":{"0":"post-192","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-java","8":"category-java-syntax","9":"category-java-conditional-branch"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/192","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=192"}],"version-history":[{"count":4,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":200,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions\/200"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/3082"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}