{"id":392,"date":"2026-03-04T08:26:01","date_gmt":"2026-03-03T23:26:01","guid":{"rendered":"https:\/\/i-third.org\/blog\/?p=392"},"modified":"2026-03-04T08:26:01","modified_gmt":"2026-03-03T23:26:01","slug":"%e3%80%90%e7%a0%94%e4%bf%ae%e3%82%a8%e3%83%b3%e3%82%b8%e3%83%8b%e3%82%a2%e5%bf%85%e8%aa%ad%e3%80%91%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e6%8c%87%e5%90%91%e3%81%ae3%e5%a4%a7%e5%8e%9f","status":"publish","type":"post","link":"https:\/\/i-third.org\/blog\/?p=392","title":{"rendered":"\u3010\u7814\u4fee\u30a8\u30f3\u30b8\u30cb\u30a2\u5fc5\u8aad\u3011\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e3\u5927\u539f\u5247\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u30ab\u30d7\u30bb\u30eb\u5316\u30fb\u7d99\u627f\u30fb\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u3068\u95a2\u6570\u578b\u3068\u306e\u9055\u3044\u307e\u3067\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"<!-- \u30ea\u30fc\u30c9\u6587 -->\n<p>\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3063\u3066\u3001\u306a\u3093\u3068\u306a\u304f\u308f\u304b\u3063\u305f\u6c17\u304c\u3059\u308b\u3051\u3069\u3001\u5b9f\u969b\u3069\u3046\u4f7f\u3046\u306e\uff1f\u300d\u2014\u2014\u305d\u3046\u611f\u3058\u3066\u3044\u308b\u30a8\u30f3\u30b8\u30cb\u30a2\u7814\u4fee\u751f\u3001\u3042\u306a\u305f\u3060\u3051\u3058\u3083\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5b66\u3073\u59cb\u3081\u308b\u3068\u3001\u5fc5\u305a\u3068\u3044\u3063\u3066\u3044\u3044\u307b\u3069\u3076\u3064\u304b\u308b\u306e\u304c<strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411<\/strong>\u306e\u58c1\u3002\u6559\u79d1\u66f8\u3092\u8aad\u3093\u3067\u3082\u300c\u30af\u30e9\u30b9\u3063\u3066\u306a\u306b\uff1f\u300d\u300c\u7d99\u627f\u3063\u3066\u4f55\u304c\u4fbf\u5229\u306a\u306e\uff1f\u300d\u3068\u30e2\u30e4\u30e2\u30e4\u3057\u305f\u307e\u307e\u9032\u3093\u3067\u3057\u307e\u3046\u4eba\u304c\u5f8c\u3092\u7d76\u3061\u307e\u305b\u3093\u3002<\/p>\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001IT\u696d\u754c\u306e\u7814\u4fee\u73fe\u5834\u3067\u7a4d\u307f\u4e0a\u3052\u3066\u304d\u305f\u77e5\u898b\u3092\u3082\u3068\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e3\u5927\u7279\u6027\uff08<strong>\u30ab\u30d7\u30bb\u30eb\u5316\u30fb\u7d99\u627f\u30fb\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0<\/strong>\uff09\u3092\u65e5\u5e38\u306e\u4f8b\u3048\u3068\u30b3\u30fc\u30c9\u3067\u89e3\u8aac\u3002\u3055\u3089\u306b\u5404\u539f\u5247\u306e<strong>\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8<\/strong>\u3068\u3001\u8fd1\u5e74\u6ce8\u76ee\u3055\u308c\u308b<strong>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306e\u9055\u3044<\/strong>\u307e\u3067\u8e0f\u307f\u8fbc\u307f\u307e\u3059\u3002\u8aad\u307f\u7d42\u3048\u308b\u3053\u308d\u306b\u306f\u3001\u8a2d\u8a08\u306e\u9078\u629e\u80a2\u304c\u4e00\u6bb5\u3068\u5e83\u304c\u3063\u3066\u3044\u308b\u306f\u305a\u3067\u3059\uff01<\/p>\n\n<hr>\n\n<!-- \u76ee\u6b21 -->\n<h2>\u76ee\u6b21<\/h2>\n<ol>\n  <li><a href=\"#premise\">\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3080\u524d\u306b\u77e5\u3063\u3066\u304a\u304d\u305f\u3044\u524d\u63d0\u77e5\u8b58<\/a><\/li>\n  <li><a href=\"#encapsulation\">\u3010\u5927\u9805\u76ee\u2460\u3011\u30ab\u30d7\u30bb\u30eb\u5316 \u2500\u2500 \u30c7\u30fc\u30bf\u3092\u5b88\u308b\u300c\u9ed2\u3044\u7bb1\u300d\u306e\u4ed5\u7d44\u307f<\/a><\/li>\n  <li><a href=\"#inheritance\">\u3010\u5927\u9805\u76ee\u2461\u3011\u7d99\u627f \u2500\u2500 \u30b3\u30fc\u30c9\u3092\u300c\u89aa\u304b\u3089\u5b50\u3078\u300d\u5f15\u304d\u7d99\u3050\u9b54\u6cd5<\/a><\/li>\n  <li><a href=\"#polymorphism\">\u3010\u5927\u9805\u76ee\u2462\u3011\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0 \u2500\u2500 \u300c\u540c\u3058\u547c\u3073\u65b9\u3001\u9055\u3046\u52d5\u304d\u300d\u306e\u67d4\u8edf\u8a2d\u8a08<\/a><\/li>\n  <li><a href=\"#functional\">\u3010\u756a\u5916\u7de8\u3011\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3088\u3046<\/a><\/li>\n  <li><a href=\"#summary\">\u307e\u3068\u3081 \u2500\u2500 3\u5927\u539f\u5247\uff0b\u03b1\u3092\u73fe\u5834\u3067\u6d3b\u304b\u3059\u305f\u3081\u306b<\/a><\/li>\n<\/ol>\n\n<hr>\n\n<!-- \u524d\u63d0\u77e5\u8b58 -->\n<h2 id=\"premise\">\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3080\u524d\u306b\u77e5\u3063\u3066\u304a\u304d\u305f\u3044\u524d\u63d0\u77e5\u8b58<\/h2>\n\n<p>\u3053\u306e\u8a18\u4e8b\u306f\u3001\u4ee5\u4e0b\u306e\u77e5\u8b58\u3092\u6301\u3063\u3066\u3044\u308b\u65b9\u3092\u5bfe\u8c61\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<ul>\n  <li>Java\u306a\u3069\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3092\u5b66\u7fd2\u4e2d\uff08\u307e\u305f\u306f\u5b66\u7fd2\u4e88\u5b9a\uff09\u306e\u65b9<\/li>\n  <li>\u5909\u6570\u30fb\u30e1\u30bd\u30c3\u30c9\u30fb\u30af\u30e9\u30b9\u3068\u3044\u3046\u8a00\u8449\u3092\u805e\u3044\u305f\u3053\u3068\u304c\u3042\u308b\u65b9<\/li>\n  <li>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\uff08if\u6587\u30fbfor\u6587\u306a\u3069\uff09\u3092\u7406\u89e3\u3057\u3066\u3044\u308b\u65b9<\/li>\n<\/ul>\n\n<p>\u300c\u30af\u30e9\u30b9\u3063\u3066\u4f55\uff1f\u300d\u3068\u3044\u3046\u6bb5\u968e\u306e\u65b9\u306f\u3001\u307e\u305a<strong>\u300c\u30af\u30e9\u30b9\u3068\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8a2d\u8a08\u56f3\u300d<\/strong>\u3068\u3044\u3046\u30a4\u30e1\u30fc\u30b8\u3092\u6301\u3063\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u5bb6\u306e\u8a2d\u8a08\u56f3\uff08\u30af\u30e9\u30b9\uff09\u304c\u3042\u308c\u3070\u3001\u540c\u3058\u69cb\u9020\u306e\u5bb6\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u3092\u3044\u304f\u3064\u3067\u3082\u5efa\u3066\u3089\u308c\u308b\u2014\u2014\u3053\u306e\u30a4\u30e1\u30fc\u30b8\u304c\u3001\u4ee5\u4e0b\u306e3\u5927\u539f\u5247\u3092\u7406\u89e3\u3059\u308b\u571f\u53f0\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n<hr>\n\n<!-- \u5927\u9805\u76ee\u2460 \u30ab\u30d7\u30bb\u30eb\u5316 -->\n<h2 id=\"encapsulation\">\u3010\u5927\u9805\u76ee\u2460\u3011\u30ab\u30d7\u30bb\u30eb\u5316 \u2500\u2500 \u30c7\u30fc\u30bf\u3092\u5b88\u308b\u300c\u9ed2\u3044\u7bb1\u300d\u306e\u4ed5\u7d44\u307f<\/h2>\n\n<h3>\u30ab\u30d7\u30bb\u30eb\u5316\u3063\u3066\u305d\u3082\u305d\u3082\u4f55\uff1f<\/h3>\n\n<p><strong>\u30ab\u30d7\u30bb\u30eb\u5316\uff08Encapsulation\uff09<\/strong>\u3068\u306f\u3001\u30c7\u30fc\u30bf\uff08\u5c5e\u6027\uff09\u3068\u51e6\u7406\uff08\u30e1\u30bd\u30c3\u30c9\uff09\u3092\u3072\u3068\u3064\u306e\u30af\u30e9\u30b9\u306b\u307e\u3068\u3081\u3001\u5916\u90e8\u304b\u3089\u76f4\u63a5\u89e6\u308c\u306a\u3044\u3088\u3046\u306b\u96a0\u853d\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n<p>\u8eab\u8fd1\u306a\u4f8b\u3067\u8a00\u3046\u3068\u3001<strong>\u8eca\u306e\u30a8\u30f3\u30b8\u30f3<\/strong>\u304c\u307e\u3055\u306b\u30ab\u30d7\u30bb\u30eb\u5316\u305d\u306e\u3082\u306e\u3067\u3059\u3002\u79c1\u305f\u3061\u306f\u30a8\u30f3\u30b8\u30f3\u306e\u5185\u90e8\u69cb\u9020\u3092\u77e5\u3089\u306a\u304f\u3066\u3082\u3001\u30a2\u30af\u30bb\u30eb\u3068\u30d6\u30ec\u30fc\u30ad\u3068\u3044\u3046\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3060\u3051\u3067\u904b\u8ee2\u3067\u304d\u307e\u3059\u3088\u306d\u3002\u5185\u90e8\u306e\u8907\u96d1\u306a\u4ed5\u7d44\u307f\u306f\u96a0\u3055\u308c\u3066\u3044\u3066\u3001\u79c1\u305f\u3061\u306f\u6c7a\u307e\u3063\u305f\u64cd\u4f5c\u53e3\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u2014\u2014\u305d\u308c\u304c\u30ab\u30d7\u30bb\u30eb\u5316\u306e\u672c\u8cea\u3067\u3059\u3002<\/p>\n\n<h3>\u5b9f\u88c5\u306e\u5177\u4f53\u7684\u306a\u30a4\u30e1\u30fc\u30b8\uff08Java\u4f8b\uff09<\/h3>\n\n<pre><code>public class BankAccount {\n    private int balance; \/\/ \u6b8b\u9ad8\uff1a\u5916\u90e8\u304b\u3089\u76f4\u63a5\u89e6\u308c\u306a\u3044\uff08private\uff09\n\n    \/\/ \u6b8b\u9ad8\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u7a93\u53e3\uff08public\u30e1\u30bd\u30c3\u30c9\uff09\n    public int getBalance() {\n        return balance;\n    }\n\n    \/\/ \u5165\u91d1\u3059\u308b\u305f\u3081\u306e\u7a93\u53e3\n    public void deposit(int amount) {\n        if (amount > 0) {\n            balance += amount;\n        }\n    }\n}<\/code><\/pre>\n\n<p>\u6b8b\u9ad8\uff08<code>balance<\/code>\uff09\u306b <code>private<\/code> \u3092\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u5916\u90e8\u304b\u3089\u76f4\u63a5 <code>balance = -99999<\/code> \u306e\u3088\u3046\u306a\u4e0d\u6b63\u306a\u66f8\u304d\u63db\u3048\u3092\u9632\u3052\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b9\u306f\u5fc5\u305a\u6c7a\u3081\u3089\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u7d4c\u7531\u2014\u2014\u3053\u308c\u304c\u30ab\u30d7\u30bb\u30eb\u5316\u306e\u5b89\u5168\u88c5\u7f6e\u3067\u3059\u3002<\/p>\n\n<h3>\u2705 \u30ab\u30d7\u30bb\u30eb\u5316\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n<ul>\n  <li><strong>\u5b89\u5168\u6027\u306e\u78ba\u4fdd\uff1a<\/strong>\u5916\u90e8\u304b\u3089\u76f4\u63a5\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u610f\u56f3\u3057\u306a\u3044\u5024\u306e\u66f8\u304d\u63db\u3048\u3084\u30d0\u30b0\u306e\u6df7\u5165\u3092\u9632\u3052\u307e\u3059\u3002\u9280\u884c\u53e3\u5ea7\u306e\u6b8b\u9ad8\u304c\u300c\u3069\u3053\u304b\u3089\u3067\u3082\u66f8\u304d\u63db\u3048\u81ea\u7531\u300d\u3067\u306f\u56f0\u308a\u307e\u3059\u3088\u306d\u3002\u305d\u308c\u3092\u9632\u3050\u306e\u304c\u30ab\u30d7\u30bb\u30eb\u5316\u3067\u3059\u3002<\/li>\n  <li><strong>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a\uff1a<\/strong>\u5185\u90e8\u5b9f\u88c5\u3092\u5909\u66f4\u3057\u3066\u3082\u3001\u5916\u90e8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\uff08\u30e1\u30bd\u30c3\u30c9\u540d\uff09\u3055\u3048\u5909\u3048\u306a\u3051\u308c\u3070\u3001\u547c\u3073\u51fa\u3057\u5143\u306e\u30b3\u30fc\u30c9\u3092\u4fee\u6b63\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u5909\u66f4\u306e\u5f71\u97ff\u7bc4\u56f2\u3092\u30af\u30e9\u30b9\u5185\u306b\u9589\u3058\u8fbc\u3081\u3089\u308c\u307e\u3059\u3002<\/li>\n  <li><strong>\u30c1\u30fc\u30e0\u958b\u767a\u306e\u52b9\u7387\u5316\uff1a<\/strong>\u300c\u3053\u306e\u30af\u30e9\u30b9\u306f\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u901a\u3058\u3066\u4f7f\u3046\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u304c\u660e\u78ba\u306b\u306a\u308b\u305f\u3081\u3001\u62c5\u5f53\u8005\u3054\u3068\u306e\u5b9f\u88c5\u306e\u5206\u696d\u304c\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u26a0\ufe0f \u30ab\u30d7\u30bb\u30eb\u5316\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u30fb\u6ce8\u610f\u70b9<\/h3>\n\n<ul>\n  <li><strong>\u30b3\u30fc\u30c9\u91cf\u304c\u5897\u3048\u308b\uff1a<\/strong>\u3059\u3079\u3066\u306e\u5c5e\u6027\u306b\u5bfe\u3057\u3066getter\u3084setter\u3092\u7528\u610f\u3059\u308b\u3068\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3082\u30b3\u30fc\u30c9\u304c\u81a8\u3089\u307f\u304c\u3061\u3067\u3059\u3002\u904e\u5270\u306a\u30ab\u30d7\u30bb\u30eb\u5316\u306f\u9006\u306b\u53ef\u8aad\u6027\u3092\u4e0b\u3052\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n  <li><strong>\u8a2d\u8a08\u30b9\u30ad\u30eb\u304c\u6c42\u3081\u3089\u308c\u308b\uff1a<\/strong>\u300c\u3069\u3053\u307e\u3067private\u306b\u3059\u308b\u304b\u300d\u300c\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u516c\u958b\u3059\u308b\u304b\u300d\u3068\u3044\u3046\u5224\u65ad\u306b\u306f\u8a2d\u8a08\u30bb\u30f3\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002\u521d\u5b66\u8005\u306e\u3046\u3061\u306f\u3001\u4f55\u3067\u3082public\u306b\u3057\u3066\u3057\u307e\u3044\u304c\u3061\u306a\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n  <li><strong>\u904e\u5270\u306a\u30ab\u30d7\u30bb\u30eb\u5316\u306f\u9006\u52b9\u679c\uff1a<\/strong>\u5fc5\u8981\u4ee5\u4e0a\u306b\u96a0\u853d\u3059\u308b\u3068\u3001\u30c6\u30b9\u30c8\u3084\u5916\u90e8\u9023\u643a\u304c\u56f0\u96e3\u306b\u306a\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u300c\u9069\u5207\u306b\u96a0\u3059\u300d\u3068\u3044\u3046\u611f\u899a\u304c\u5927\u5207\u3067\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u30ab\u30d7\u30bb\u30eb\u5316\u306e3\u3064\u306e\u7d50\u8ad6<\/h3>\n\n<ul>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2460\uff1a\u30c7\u30fc\u30bf\u3068\u51e6\u7406\u3092\u3072\u3068\u307e\u3068\u3081\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30b9\u306e\u5185\u90e8\u69cb\u9020\u3092\u5916\u90e8\u304b\u3089\u96a0\u853d\u3067\u304d\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2461\uff1aprivate\u30fbpublic\u306e\u4f7f\u3044\u5206\u3051\u306b\u3088\u308a\u3001\u610f\u56f3\u3057\u306a\u3044\u30c7\u30fc\u30bf\u64cd\u4f5c\u3092\u9632\u304e\u3001\u5b89\u5168\u6027\u304c\u9ad8\u307e\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2462\uff1a\u30d0\u30b0\u306e\u767a\u751f\u6e90\u304c\u30af\u30e9\u30b9\u5185\u306b\u5c40\u6240\u5316\u3055\u308c\u308b\u305f\u3081\u3001\u30c7\u30d0\u30c3\u30b0\u3068\u4fdd\u5b88\u306e\u30b3\u30b9\u30c8\u304c\u5927\u5e45\u306b\u4e0b\u304c\u308b<\/strong><\/li>\n<\/ul>\n\n<hr>\n\n<!-- \u5927\u9805\u76ee\u2461 \u7d99\u627f -->\n<h2 id=\"inheritance\">\u3010\u5927\u9805\u76ee\u2461\u3011\u7d99\u627f \u2500\u2500 \u30b3\u30fc\u30c9\u3092\u300c\u89aa\u304b\u3089\u5b50\u3078\u300d\u5f15\u304d\u7d99\u3050\u9b54\u6cd5<\/h2>\n\n<h3>\u7d99\u627f\u3063\u3066\u305d\u3082\u305d\u3082\u4f55\uff1f<\/h3>\n\n<p><strong>\u7d99\u627f\uff08Inheritance\uff09<\/strong>\u3068\u306f\u3001\u65e2\u5b58\u306e\u30af\u30e9\u30b9\uff08\u89aa\u30af\u30e9\u30b9\uff1d\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\uff09\u306e\u5c5e\u6027\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u3001\u65b0\u3057\u3044\u30af\u30e9\u30b9\uff08\u5b50\u30af\u30e9\u30b9\uff1d\u30b5\u30d6\u30af\u30e9\u30b9\uff09\u304c\u5f15\u304d\u7d99\u3044\u3067\u4f7f\u3048\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n<p>\u65e5\u5e38\u7684\u306a\u4f8b\u3048\u3067\u8a00\u3046\u3068\u3001\u300c\u4e57\u308a\u7269\u300d\u3068\u3044\u3046\u5927\u304d\u306a\u30ab\u30c6\u30b4\u30ea\u304c\u3042\u3063\u305f\u3068\u3057\u3066\u3001\u305d\u3053\u304b\u3089\u300c\u81ea\u52d5\u8eca\u300d\u300c\u81ea\u8ee2\u8eca\u300d\u300c\u30d0\u30a4\u30af\u300d\u304c\u305d\u308c\u305e\u308c\u6d3e\u751f\u3057\u3066\u3044\u304f\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002\u3069\u308c\u3082\u300c\u79fb\u52d5\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u5171\u901a\u306e\u7279\u6027\uff08\u30e1\u30bd\u30c3\u30c9\uff09\u3092\u6301\u3061\u306a\u304c\u3089\u3001\u305d\u308c\u305e\u308c\u56fa\u6709\u306e\u52d5\u304d\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h3>\u5b9f\u88c5\u306e\u5177\u4f53\u7684\u306a\u30a4\u30e1\u30fc\u30b8\uff08Java\u4f8b\uff09<\/h3>\n\n<pre><code>\/\/ \u89aa\u30af\u30e9\u30b9\uff1a\u4e57\u308a\u7269\npublic class Vehicle {\n    protected String name;\n\n    public void move() {\n        System.out.println(name + \"\u304c\u79fb\u52d5\u3057\u307e\u3059\");\n    }\n}\n\n\/\/ \u5b50\u30af\u30e9\u30b9\uff1a\u81ea\u52d5\u8eca\uff08Vehicle\u3092\u7d99\u627f\uff09\npublic class Car extends Vehicle {\n    public Car() {\n        this.name = \"\u81ea\u52d5\u8eca\";\n    }\n\n    \/\/ \u81ea\u52d5\u8eca\u56fa\u6709\u306e\u52d5\u4f5c\u3092\u8ffd\u52a0\n    public void honk() {\n        System.out.println(\"\u30af\u30e9\u30af\u30b7\u30e7\u30f3\u3092\u9cf4\u3089\u3057\u307e\u3059\");\n    }\n}<\/code><\/pre>\n\n<p><code>Car<\/code> \u30af\u30e9\u30b9\u306f <code>Vehicle<\/code> \u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u306e\u3067\u3001<code>move()<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u305d\u306e\u307e\u307e\u4f7f\u3048\u307e\u3059\u3002\u540c\u6642\u306b\u3001<code>honk()<\/code> \u3068\u3044\u3046\u81ea\u52d5\u8eca\u3060\u3051\u306e\u6a5f\u80fd\u3082\u8ffd\u52a0\u3067\u304d\u308b\u3002<strong>\u5171\u901a\u90e8\u5206\u306f\u89aa\u306b\u307e\u3068\u3081\u3001\u56fa\u6709\u90e8\u5206\u3060\u3051\u5b50\u306b\u66f8\u304f<\/strong>\u2014\u2014\u3053\u308c\u304c\u7d99\u627f\u306e\u7f8e\u3057\u3055\u3067\u3059\u3002<\/p>\n\n<h3>\u2705 \u7d99\u627f\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n<ul>\n  <li><strong>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\uff1a<\/strong>\u89aa\u30af\u30e9\u30b9\u306b\u5171\u901a\u51e6\u7406\u3092\u307e\u3068\u3081\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\u4fee\u6b63\u3082\u89aa\u30af\u30e9\u30b91\u304b\u6240\u3067\u6e08\u3080\u305f\u3081\u3001\u5909\u66f4\u6f0f\u308c\u306e\u30ea\u30b9\u30af\u304c\u6fc0\u6e1b\u3057\u307e\u3059\u3002<\/li>\n  <li><strong>\u62e1\u5f35\u6027\u306e\u9ad8\u3055\uff1a<\/strong>\u65b0\u3057\u3044\u6a5f\u80fd\u3092\u6301\u3064\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3068\u304d\u3001\u89aa\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3059\u308b\u3060\u3051\u3067\u65e2\u5b58\u306e\u51e6\u7406\u3092\u5f15\u304d\u7d99\u3052\u307e\u3059\u3002\u300c\u30bc\u30ed\u304b\u3089\u66f8\u304f\u300d\u5fc5\u8981\u304c\u306a\u304f\u3001\u958b\u767a\u30b9\u30d4\u30fc\u30c9\u304c\u4e0a\u304c\u308a\u307e\u3059\u3002<\/li>\n  <li><strong>\u73fe\u5b9f\u4e16\u754c\u306e\u30e2\u30c7\u30eb\u5316\uff1a<\/strong>\u300c\u81ea\u52d5\u8eca\u306f\u4e57\u308a\u7269\u3067\u3042\u308b\uff08is-a\u95a2\u4fc2\uff09\u300d\u3068\u3044\u3046\u73fe\u5b9f\u306e\u968e\u5c64\u69cb\u9020\u3092\u3001\u305d\u306e\u307e\u307e\u30b3\u30fc\u30c9\u3067\u8868\u73fe\u3067\u304d\u307e\u3059\u3002\u8a2d\u8a08\u306e\u610f\u56f3\u304c\u4f1d\u308f\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u26a0\ufe0f \u7d99\u627f\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u30fb\u6ce8\u610f\u70b9<\/h3>\n\n<ul>\n  <li><strong>\u89aa\u5b50\u306e\u5f37\u3044\u7d50\u5408\uff08\u5bc6\u7d50\u5408\uff09\uff1a<\/strong>\u89aa\u30af\u30e9\u30b9\u306e\u5909\u66f4\u304c\u3001\u610f\u56f3\u305b\u305a\u5b50\u30af\u30e9\u30b9\u306e\u52d5\u4f5c\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u300c\u89aa\u3092\u76f4\u3057\u305f\u3089\u5b50\u304c\u58ca\u308c\u305f\u300d\u3068\u3044\u3046\u554f\u984c\u306f\u3001\u7d99\u627f\u306e\u6df1\u307f\u306b\u306f\u307e\u308b\u307b\u3069\u8d77\u304d\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n  <li><strong>\u7d99\u627f\u306e\u591a\u7528\u306f\u8a2d\u8a08\u3092\u8907\u96d1\u306b\u3059\u308b\uff1a<\/strong>\u7d99\u627f\u306e\u968e\u5c64\u304c\u6df1\u304f\u306a\u308b\u3068\u3001\u3069\u306e\u30af\u30e9\u30b9\u304c\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3063\u3066\u3044\u308b\u304b\u3092\u8ffd\u3046\u306e\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u300c3\u968e\u5c64\u4ee5\u4e0a\u306e\u7d99\u627f\u306f\u8981\u6ce8\u610f\u300d\u3068\u73fe\u5834\u3067\u306f\u8a00\u308f\u308c\u307e\u3059\u3002<\/li>\n  <li><strong>is-a\u95a2\u4fc2\u3067\u306a\u3044\u4f7f\u3044\u65b9\u306fNG\uff1a<\/strong>\u300c\u30b3\u30fc\u30c9\u3092\u6d41\u7528\u3057\u305f\u3044\u3060\u3051\u300d\u3068\u3044\u3046\u7406\u7531\u3067\u7d99\u627f\u3059\u308b\u306e\u306f\u8aa4\u308a\u3067\u3059\u3002\u305d\u306e\u5834\u5408\u306f<strong>\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3\uff08has-a\u95a2\u4fc2\uff09<\/strong>\u306e\u5229\u7528\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n\n<h3>\u7d99\u627f\u306e3\u3064\u306e\u7d50\u8ad6<\/h3>\n\n<ul>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2460\uff1a\u89aa\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u3092\u5b50\u30af\u30e9\u30b9\u3067\u518d\u5229\u7528\u3067\u304d\u3001\u540c\u3058\u51e6\u7406\u3092\u4f55\u5ea6\u3082\u66f8\u304f\u300c\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u300d\u3092\u6839\u672c\u304b\u3089\u9632\u3052\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2461\uff1a\u89aa\u30af\u30e9\u30b9\u3092\u4fee\u6b63\u3059\u308c\u3070\u5168\u5b50\u30af\u30e9\u30b9\u306b\u5909\u66f4\u304c\u53cd\u6620\u3055\u308c\u308b\u305f\u3081\u3001\u62e1\u5f35\u6027\u30fb\u4fdd\u5b88\u6027\u304c\u683c\u6bb5\u306b\u5411\u4e0a\u3059\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2462\uff1a\u30af\u30e9\u30b9\u968e\u5c64\u3092\u4f7f\u3063\u3066\u73fe\u5b9f\u4e16\u754c\u306e\u300cis-a\u95a2\u4fc2\u300d\u3092\u81ea\u7136\u306b\u30e2\u30c7\u30eb\u5316\u3067\u304d\u308b\uff08\u305f\u3060\u3057\u6df1\u3044\u968e\u5c64\u306f\u9006\u52b9\u679c\uff09<\/strong><\/li>\n<\/ul>\n\n<hr>\n\n<!-- \u5927\u9805\u76ee\u2462 \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0 -->\n<h2 id=\"polymorphism\">\u3010\u5927\u9805\u76ee\u2462\u3011\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0 \u2500\u2500 \u300c\u540c\u3058\u547c\u3073\u65b9\u3001\u9055\u3046\u52d5\u304d\u300d\u306e\u67d4\u8edf\u8a2d\u8a08<\/h2>\n\n<h3>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3063\u3066\u305d\u3082\u305d\u3082\u4f55\uff1f<\/h3>\n\n<p><strong>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\uff08Polymorphism\uff09<\/strong>\u3068\u306f\u3001\u540c\u3058\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\uff08\u30e1\u30bd\u30c3\u30c9\u540d\uff09\u3092\u901a\u3058\u3066\u3001\u7570\u306a\u308b\u30af\u30e9\u30b9\u304c\u7570\u306a\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u300c\u591a\u614b\u6027\u300d\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n\n<p>\u65e5\u5e38\u306e\u4f8b\u3048\u3067\u8a00\u3046\u3068\u3001<strong>\u30c6\u30ec\u30d3\u306e\u30ea\u30e2\u30b3\u30f3\u306e\u96fb\u6e90\u30dc\u30bf\u30f3<\/strong>\u304c\u307e\u3055\u306b\u305d\u308c\u3002\u3069\u306e\u30e1\u30fc\u30ab\u30fc\u306e\u30c6\u30ec\u30d3\u3067\u3082\u300c\u96fb\u6e90\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u300d\u3068\u3044\u3046\u64cd\u4f5c\u306f\u540c\u3058\u3067\u3059\u304c\u3001\u5185\u90e8\u7684\u306a\u51e6\u7406\u306f\u30e1\u30fc\u30ab\u30fc\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u64cd\u4f5c\u3059\u308b\u5074\u306f\u300c\u96fb\u6e90\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u300d\u3068\u3044\u3046\u7d71\u4e00\u3057\u305f\u624b\u9806\u3060\u3051\u77e5\u3063\u3066\u3044\u308c\u3070\u3044\u3044\u2014\u2014\u305d\u308c\u304c\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u529b\u3067\u3059\u3002<\/p>\n\n<h3>\u5b9f\u88c5\u306e\u5177\u4f53\u7684\u306a\u30a4\u30e1\u30fc\u30b8\uff08Java\u4f8b\uff09<\/h3>\n\n<pre><code>\/\/ \u5171\u901a\u306e\u62bd\u8c61\u30af\u30e9\u30b9\npublic abstract class Shape {\n    public abstract void draw(); \/\/ \u5171\u901a\u30e1\u30bd\u30c3\u30c9\n}\n\n\/\/ \u5186\u30af\u30e9\u30b9\npublic class Circle extends Shape {\n    public void draw() {\n        System.out.println(\"\u25cb \u5186\u3092\u63cf\u304d\u307e\u3059\");\n    }\n}\n\n\/\/ \u56db\u89d2\u30af\u30e9\u30b9\npublic class Rectangle extends Shape {\n    public void draw() {\n        System.out.println(\"\u25a1 \u56db\u89d2\u3092\u63cf\u304d\u307e\u3059\");\n    }\n}\n\n\/\/ \u4f7f\u3046\u5074\uff1aShape\u578b\u3067\u307e\u3068\u3081\u3066\u6271\u3048\u308b\uff01\nShape[] shapes = { new Circle(), new Rectangle() };\nfor (Shape s : shapes) {\n    s.draw(); \/\/ \u540c\u3058\u547c\u3073\u65b9\u3067\u3001\u5404\u30af\u30e9\u30b9\u306e\u51e6\u7406\u304c\u52d5\u304f\n}<\/code><\/pre>\n\n<p><code>draw()<\/code> \u3068\u3044\u3046\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u540d\u3067\u3001\u5186\u306f\u5186\u306e\u63cf\u304d\u65b9\u3001\u56db\u89d2\u306f\u56db\u89d2\u306e\u63cf\u304d\u65b9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u65b0\u3057\u3044\u56f3\u5f62\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3057\u3066\u3082\u3001\u4f7f\u3046\u5074\u306e\u30b3\u30fc\u30c9\uff08for\u30eb\u30fc\u30d7\u90e8\u5206\uff09\u306f\u4e00\u5207\u5909\u66f4\u4e0d\u8981\u3067\u3059\u3002<\/p>\n\n<h3>\u2705 \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n<ul>\n  <li><strong>\u30b3\u30fc\u30c9\u306e\u7d71\u4e00\u6027\u3068\u53ef\u8aad\u6027\uff1a<\/strong>\u51e6\u7406\u306e\u7a2e\u985e\u304c\u5897\u3048\u3066\u3082\u3001\u547c\u3073\u51fa\u3057\u5074\u306f\u300c\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u3060\u3051\u300d\u3067\u3088\u304f\u306a\u308a\u307e\u3059\u3002\u6761\u4ef6\u5206\u5c90\uff08if-else\uff09\u3060\u3089\u3051\u306e\u30b3\u30fc\u30c9\u304c\u6fc0\u6e1b\u3057\u3001\u3059\u3063\u304d\u308a\u3068\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n  <li><strong>\u62e1\u5f35\u306b\u5f37\u3044\u8a2d\u8a08\uff08\u958b\u653e\u9589\u9396\u306e\u539f\u5247\uff09\uff1a<\/strong>\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3068\u304d\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u305b\u305a\u306b\u6a5f\u80fd\u62e1\u5f35\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u8a2d\u8a08\u306e\u539f\u5247\u300cOCP\uff08Open\/Closed Principle\uff09\u300d\u305d\u306e\u3082\u306e\u3067\u3059\u3002<\/li>\n  <li><strong>\u30c1\u30fc\u30e0\u5206\u696d\u306e\u660e\u78ba\u5316\uff1a<\/strong>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3055\u3048\u6c7a\u3081\u308c\u3070\u3001\u5404\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u306f\u5225\u3005\u306e\u30e1\u30f3\u30d0\u30fc\u304c\u4e26\u884c\u3057\u3066\u9032\u3081\u3089\u308c\u307e\u3059\u3002\u5927\u898f\u6a21\u958b\u767a\u3067\u306e\u751f\u7523\u6027\u5411\u4e0a\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u26a0\ufe0f \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u30fb\u6ce8\u610f\u70b9<\/h3>\n\n<ul>\n  <li><strong>\u52d5\u4f5c\u306e\u8ffd\u8de1\u304c\u96e3\u3057\u304f\u306a\u308b\uff1a<\/strong>\u300c\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3093\u3060\u3068\u304d\u3001\u5b9f\u969b\u306b\u3069\u306e\u30af\u30e9\u30b9\u306e\u51e6\u7406\u304c\u52d5\u304f\u306e\u304b\uff1f\u300d\u304c\u30b3\u30fc\u30c9\u3092\u898b\u305f\u3060\u3051\u3067\u306f\u308f\u304b\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u30c7\u30d0\u30c3\u30b0\u6642\u306b\u6df7\u4e71\u3057\u3084\u3059\u3044\u70b9\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n  <li><strong>\u904e\u5270\u306a\u62bd\u8c61\u5316\u306f\u304b\u3048\u3063\u3066\u8907\u96d1\u306b\uff1a<\/strong>\u5c06\u6765\u306e\u5909\u66f4\u3092\u898b\u8d8a\u3057\u3066\u62bd\u8c61\u5316\u3092\u9032\u3081\u3059\u304e\u308b\u3068\u3001\u300c\u4f55\u306e\u305f\u3081\u306e\u30af\u30e9\u30b9\u304b\u300d\u304c\u308f\u304b\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u300c\u4eca\u5fc5\u8981\u306a\u62bd\u8c61\u5316\u3060\u3051\u3092\u884c\u3046\uff08YAGNI\u539f\u5247\uff09\u300d\u304c\u9244\u5247\u3067\u3059\u3002<\/li>\n  <li><strong>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u8a2d\u8a08\u306e\u8cea\u304c\u554f\u308f\u308c\u308b\uff1a<\/strong>\u5171\u901a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u8a2d\u8a08\u304c\u7518\u3044\u3068\u3001\u5f8c\u304b\u3089\u4fee\u6b63\u3059\u308b\u30b3\u30b9\u30c8\u304c\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002\u8a2d\u8a08\u6bb5\u968e\u3067\u306e\u614e\u91cd\u306a\u691c\u8a0e\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e3\u3064\u306e\u7d50\u8ad6<\/h3>\n\n<ul>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2460\uff1a\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u540d\u3067\u7570\u306a\u308b\u30af\u30e9\u30b9\u306e\u51e6\u7406\u3092\u7d71\u4e00\u7684\u306b\u547c\u3073\u51fa\u305b\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u3068\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2461\uff1a\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3057\u3066\u3082\u65e2\u5b58\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u3001\u300c\u958b\u653e\u9589\u9396\u306e\u539f\u5247\u300d\u306b\u6cbf\u3063\u305f\u5b89\u5168\u306a\u62e1\u5f35\u304c\u3067\u304d\u308b<\/strong><\/li>\n  <li>\u2705 <strong>\u7d50\u8ad6\u2462\uff1a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5171\u901a\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u5206\u696d\u304c\u660e\u78ba\u306b\u306a\u308a\u3001\u4e26\u884c\u4f5c\u696d\u304c\u30b9\u30e0\u30fc\u30ba\u306b\u306a\u308b<\/strong><\/li>\n<\/ul>\n\n<hr>\n\n<!-- \u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306e\u6bd4\u8f03 -->\n<h2 id=\"functional\">\u3010\u756a\u5916\u7de8\u3011\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n\n<h3>\u305d\u3082\u305d\u3082\u300c\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u300d\u3063\u3066\u4f55\uff1f<\/h3>\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u5bfe\u6bd4\u3068\u3057\u3066\u3088\u304f\u6319\u3052\u3089\u308c\u308b\u306e\u304c<strong>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff08Functional Programming\uff09<\/strong>\u3067\u3059\u3002\u8fd1\u5e74\u3001Java\u3084Python\u306a\u3069\u306e\u4e3b\u8981\u8a00\u8a9e\u306b\u3082\u95a2\u6570\u578b\u306e\u7279\u5fb4\u304c\u53d6\u308a\u5165\u308c\u3089\u308c\u3001\u73fe\u5834\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3068\u3063\u3066\u907f\u3051\u3066\u901a\u308c\u306a\u3044\u6982\u5ff5\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<p>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6838\u5fc3\u306f\u3001<strong>\u300c\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u305b\u305a\u3001\u95a2\u6570\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u51e6\u7406\u3092\u8868\u73fe\u3059\u308b\u300d<\/strong>\u3068\u3044\u3046\u8003\u3048\u65b9\u3067\u3059\u3002\u6570\u5b66\u306e\u95a2\u6570\u306e\u3088\u3046\u306b\u300c\u540c\u3058\u5165\u529b\u306b\u306f\u5fc5\u305a\u540c\u3058\u51fa\u529b\u304c\u8fd4\u308b\uff08\u526f\u4f5c\u7528\u306e\u306a\u3044\u51e6\u7406\uff09\u300d\u3092\u7406\u60f3\u3068\u3057\u307e\u3059\u3002<\/p>\n\n<h3>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411 vs \u95a2\u6570\u578b\uff1a\u8003\u3048\u65b9\u306e\u6839\u672c\u7684\u306a\u9055\u3044<\/h3>\n\n<table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\">\n  <thead>\n    <tr style=\"background-color: #f0f4ff;\">\n      <th>\u89b3\u70b9<\/th>\n      <th>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\uff08OOP\uff09<\/th>\n      <th>\u95a2\u6570\u578b\uff08FP\uff09<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td><strong>\u4e2d\u5fc3\u7684\u306a\u6982\u5ff5<\/strong><\/td>\n      <td>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u30c7\u30fc\u30bf\uff0b\u51e6\u7406\uff09<\/td>\n      <td>\u95a2\u6570\uff08\u5165\u529b\u2192\u51fa\u529b\u306e\u5909\u63db\uff09<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u72b6\u614b\u306e\u6271\u3044<\/strong><\/td>\n      <td>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5185\u90e8\u306b\u72b6\u614b\u3092\u6301\u3064<\/td>\n      <td>\u72b6\u614b\u306e\u5909\u66f4\u3092\u907f\u3051\u308b\uff08\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\uff09<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u51e6\u7406\u306e\u8868\u73fe<\/strong><\/td>\n      <td>\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u3067\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b<\/td>\n      <td>\u95a2\u6570\u306e\u7d44\u307f\u5408\u308f\u305b\uff08\u5408\u6210\uff09\u3067\u51e6\u7406\u3092\u8868\u73fe<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u526f\u4f5c\u7528<\/strong><\/td>\n      <td>\u72b6\u614b\u5909\u5316\uff08\u526f\u4f5c\u7528\uff09\u3092\u524d\u63d0\u3068\u3057\u305f\u8a2d\u8a08<\/td>\n      <td>\u526f\u4f5c\u7528\u3092\u3067\u304d\u308b\u9650\u308a\u6392\u9664\u3059\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u5f97\u610f\u306a\u5834\u9762<\/strong><\/td>\n      <td>\u5927\u898f\u6a21\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3001UI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/td>\n      <td>\u30c7\u30fc\u30bf\u5909\u63db\u51e6\u7406\u3001\u4e26\u884c\u51e6\u7406\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u4e3b\u306a\u8a00\u8a9e\u4f8b<\/strong><\/td>\n      <td>Java\u3001C#\u3001Python\uff08OOP\u5074\u9762\uff09<\/td>\n      <td>Haskell\u3001Scala\u3001Clojure\u3001Elixir<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h3>Java\u3067\u898b\u308b\u300cOOP\u7684\u306a\u66f8\u304d\u65b9\u300dvs\u300c\u95a2\u6570\u578b\u7684\u306a\u66f8\u304d\u65b9\u300d<\/h3>\n\n<p>\u540c\u3058\u300c\u30ea\u30b9\u30c8\u304b\u3089\u5076\u6570\u3060\u3051\u3092\u53d6\u308a\u51fa\u3059\u300d\u51e6\u7406\u3092\u6bd4\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<p><strong>OOP\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\uff08\u547d\u4ee4\u578b\uff09\uff1a<\/strong><\/p>\n<pre><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5, 6);\nList&lt;Integer&gt; evens = new ArrayList&lt;&gt;();\n\nfor (int n : numbers) {\n    if (n % 2 == 0) {\n        evens.add(n); \/\/ \u30ea\u30b9\u30c8\u306e\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b\n    }\n}\n\/\/ evens \u2192 [2, 4, 6]<\/code><\/pre>\n\n<p><strong>\u95a2\u6570\u578b\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\uff08Java Stream API\uff09\uff1a<\/strong><\/p>\n<pre><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5, 6);\nList&lt;Integer&gt; evens = numbers.stream()\n    .filter(n -&gt; n % 2 == 0) \/\/ \u6761\u4ef6\u3092\u300c\u95a2\u6570\u300d\u3068\u3057\u3066\u6e21\u3059\n    .collect(Collectors.toList());\n\/\/ evens \u2192 [2, 4, 6]<\/code><\/pre>\n\n<p>\u95a2\u6570\u578b\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u300c\u4f55\u3092\u3057\u305f\u3044\u304b\uff08What\uff09\u300d\u3092\u5ba3\u8a00\u7684\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002OOP\u7684\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u300c\u3069\u3046\u3084\u308b\u304b\uff08How\uff09\u300d\u3092\u624b\u9806\u3068\u3057\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002\u3069\u3061\u3089\u304c\u512a\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u8a71\u3067\u306f\u306a\u304f\u3001<strong>\u5834\u9762\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u73fe\u4ee3\u306e\u958b\u767a\u30b9\u30bf\u30a4\u30eb<\/strong>\u3067\u3059\u3002<\/p>\n\n<h3>\u2705 \u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n<ul>\n  <li><strong>\u30c6\u30b9\u30c8\u306e\u3057\u3084\u3059\u3055\uff1a<\/strong>\u540c\u3058\u5165\u529b\u306b\u306f\u5fc5\u305a\u540c\u3058\u51fa\u529b\u304c\u8fd4\u308b\u305f\u3081\u3001\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u304c\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308a\u307e\u3059\u3002\u526f\u4f5c\u7528\u304c\u306a\u3044\u306e\u3067\u3001\u30c6\u30b9\u30c8\u74b0\u5883\u306e\u6e96\u5099\u304c\u6700\u5c0f\u9650\u3067\u6e08\u307f\u307e\u3059\u3002<\/li>\n  <li><strong>\u4e26\u884c\u51e6\u7406\u3068\u306e\u89aa\u548c\u6027\uff1a<\/strong>\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3057\u306a\u3044\uff08\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\uff09\u8a2d\u8a08\u306f\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u3058\u30c7\u30fc\u30bf\u3092\u6271\u3046\u4e26\u884c\u51e6\u7406\u306b\u304a\u3044\u3066\u7af6\u5408\u72b6\u614b\uff08race condition\uff09\u3092\u9632\u304e\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n  <li><strong>\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u3055\uff1a<\/strong>Stream API\u3084\u30e9\u30e0\u30c0\u5f0f\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30eb\u30fc\u30d7\u3084\u6761\u4ef6\u5206\u5c90\u3092\u77ed\u304f\u5ba3\u8a00\u7684\u306b\u66f8\u3051\u307e\u3059\u3002\u610f\u56f3\u304c\u4f1d\u308f\u308a\u3084\u3059\u304f\u3001\u30d0\u30b0\u3082\u5165\u308a\u8fbc\u307f\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u26a0\ufe0f \u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u30fb\u6ce8\u610f\u70b9<\/h3>\n\n<ul>\n  <li><strong>\u5b66\u7fd2\u30b3\u30b9\u30c8\u304c\u9ad8\u3044\uff1a<\/strong>\u300c\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u300d\u300c\u9ad8\u968e\u95a2\u6570\u300d\u300c\u30e2\u30ca\u30c9\u300d\u306a\u3069\u3001OOP\u3068\u306f\u7570\u306a\u308b\u6982\u5ff5\u4f53\u7cfb\u3092\u7fd2\u5f97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6163\u308c\u308b\u307e\u3067\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/li>\n  <li><strong>\u72b6\u614b\u7ba1\u7406\u304c\u8907\u96d1\u306b\u306a\u308b\u30b1\u30fc\u30b9\u3082\uff1a<\/strong>\u72b6\u614b\u306e\u5909\u66f4\u3092\u5b8c\u5168\u306b\u6392\u9664\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u9006\u306b\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u73fe\u5b9f\u306e\u30d3\u30b8\u30cd\u30b9\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u72b6\u614b\u3092\u6301\u3064\u3053\u3068\u304c\u81ea\u7136\u306a\u30b1\u30fc\u30b9\u3082\u591a\u3044\u3067\u3059\u3002<\/li>\n  <li><strong>\u30c1\u30fc\u30e0\u306e\u30b9\u30ad\u30eb\u30bb\u30c3\u30c8\u304c\u554f\u308f\u308c\u308b\uff1a<\/strong>\u30c1\u30fc\u30e0\u5168\u54e1\u304c\u95a2\u6570\u578b\u306e\u8003\u3048\u65b9\u3092\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u3068\u3001\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3084\u4fdd\u5b88\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u5c0e\u5165\u306b\u306f\u6bb5\u968e\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u6709\u52b9\u3067\u3059\u3002<\/li>\n<\/ul>\n\n<h3>\u7d50\u8ad6\uff1aOOP\u3068\u95a2\u6570\u578b\u306f\u300c\u5bfe\u7acb\u300d\u3067\u306f\u306a\u304f\u300c\u88dc\u5b8c\u300d\u306e\u95a2\u4fc2<\/h3>\n\n<p>\u91cd\u8981\u306a\u306e\u306f\u300c\u3069\u3061\u3089\u304c\u6b63\u3057\u3044\u304b\u300d\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u73fe\u4ee3\u306e\u958b\u767a\u73fe\u5834\u3067\u306f\u3001<strong>OOP\u3068\u95a2\u6570\u578b\u306e\u8003\u3048\u65b9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30a2\u30d7\u30ed\u30fc\u30c1<\/strong>\u304c\u4e3b\u6d41\u3067\u3059\u3002<\/p>\n\n<ul>\n  <li>\u5927\u67a0\u306e\u8a2d\u8a08\u30fb\u5f79\u5272\u5206\u62c5 \u2192 <strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411<\/strong>\u3067\u6574\u7406<\/li>\n  <li>\u30c7\u30fc\u30bf\u5909\u63db\u30fb\u96c6\u8a08\u51e6\u7406 \u2192 <strong>\u95a2\u6570\u578b\uff08Stream\/\u30e9\u30e0\u30c0\uff09<\/strong>\u3067\u7c21\u6f54\u306b\u8a18\u8ff0<\/li>\n<\/ul>\n\n<p>\u300c\u4f7f\u3044\u5206\u3051\u308b\u8996\u70b9\u300d\u3092\u6301\u3064\u3053\u3068\u304c\u3001\u4e00\u6bb5\u4e0a\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u3078\u306e\u8fd1\u9053\u3067\u3059\u3002<\/p>\n\n<hr>\n\n<!-- \u307e\u3068\u3081 -->\n<h2 id=\"summary\">\u307e\u3068\u3081 \u2500\u2500 3\u5927\u539f\u5247\uff0b\u03b1\u3092\u73fe\u5834\u3067\u6d3b\u304b\u3059\u305f\u3081\u306b<\/h2>\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e3\u5927\u7279\u6027\u3068\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u8981\u70b9\u3092\u6574\u7406\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\">\n  <thead>\n    <tr style=\"background-color: #f0f4ff;\">\n      <th>\u539f\u5247\u30fb\u6982\u5ff5<\/th>\n      <th>\u4e00\u8a00\u3067\u8a00\u3046\u3068<\/th>\n      <th>\u6700\u5927\u306e\u30e1\u30ea\u30c3\u30c8<\/th>\n      <th>\u4e3b\u306a\u6ce8\u610f\u70b9<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td><strong>\u30ab\u30d7\u30bb\u30eb\u5316<\/strong><\/td>\n      <td>\u30c7\u30fc\u30bf\u3092\u5b88\u308b\u9ed2\u3044\u7bb1<\/td>\n      <td>\u5b89\u5168\u6027\u30fb\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/td>\n      <td>\u904e\u5270\u306a\u96a0\u853d\u306f\u30c6\u30b9\u30c8\u3092\u56f0\u96e3\u306b\u3059\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u7d99\u627f<\/strong><\/td>\n      <td>\u89aa\u304b\u3089\u5b50\u3078\u30b3\u30fc\u30c9\u3092\u5f15\u304d\u7d99\u3050<\/td>\n      <td>\u518d\u5229\u7528\u6027\u30fb\u62e1\u5f35\u6027\u306e\u5411\u4e0a<\/td>\n      <td>\u6df1\u3044\u968e\u5c64\u306f\u5bc6\u7d50\u5408\u3068\u8907\u96d1\u3055\u3092\u751f\u3080<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0<\/strong><\/td>\n      <td>\u540c\u3058\u547c\u3073\u65b9\u3001\u9055\u3046\u52d5\u304d<\/td>\n      <td>\u67d4\u8edf\u6027\u30fb\u62e1\u5f35\u3078\u306e\u5f37\u3055<\/td>\n      <td>\u52d5\u4f5c\u8ffd\u8de1\u304c\u96e3\u3057\u304f\u306a\u308b\u5834\u5408\u304c\u3042\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0<\/strong><\/td>\n      <td>\u95a2\u6570\u3067\u51e6\u7406\u3092\u7d44\u307f\u7acb\u3066\u308b<\/td>\n      <td>\u30c6\u30b9\u30c8\u3057\u3084\u3059\u304f\u4e26\u884c\u51e6\u7406\u306b\u5f37\u3044<\/td>\n      <td>\u5b66\u7fd2\u30b3\u30b9\u30c8\u304c\u9ad8\u304f\u3001\u7fd2\u719f\u306b\u6642\u9593\u304c\u304b\u304b\u308b<\/td>\n    <\/tr>\n  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