{"id":839,"date":"2023-07-30T06:19:14","date_gmt":"2022-11-27T11:16:47","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8boops%ef%bc%88%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%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%ef%bc%89\/"},"modified":"2025-08-01T02:55:16","modified_gmt":"2025-07-31T17:55:16","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8boops%ef%bc%88%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%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8boops%ef%bc%88%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%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0%ef%bc%89\/","title":{"rendered":"Java\u306b\u304a\u3051\u308bOOPS\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff09\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u306b\u3064\u3044\u3066 &#8211; OOPS\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u4f8b"},"content":{"rendered":"<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002OOPS\u306e\u6982\u5ff5\u306b\u3064\u3044\u3066\u306e\u7406\u89e3\u304c\u306a\u3051\u308c\u3070\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30e2\u30c7\u30eb\u3067\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h2>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30e2\u30c7\u30eb\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30e2\u30c7\u30eb\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3044\u3046\u6982\u5ff5\u3092\u4e2d\u5fc3\u306b\u5c55\u958b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u3002\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u95a2\u6570\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u5b9f\u4e16\u754c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u3042\u306a\u305f\u306e\u8eca\u3084\u5bb6\u3001\u30ce\u30fc\u30c8\u30d1\u30bd\u30b3\u30f3\u306a\u3069\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u305d\u308c\u3089\u306f\u7279\u5b9a\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3061\u3001\u3042\u308b\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3067\u306f\u3001\u30af\u30e9\u30b9\u3068\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f\u30af\u30e9\u30b9\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8a2d\u8a08\u56f3\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u6a5f\u80fd\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30ce\u30fc\u30c8\u30d1\u30bd\u30b3\u30f3\u306f\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u3042\u306a\u305f\u306e\u30ce\u30fc\u30c8\u30d1\u30bd\u30b3\u30f3\u306f\u305d\u308c\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u3002<\/p>\n<h2>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u6982\u5ff5<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65649ce1daa94e2bdf7c1bf6\/4-0.jpg\" alt=\"oops concepts, object oriented programming concepts, oops concepts in java\" \/><\/div>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u62bd\u8c61\u5316<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ab\u30d7\u30bb\u30eb\u5316<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7d99\u627f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u95a2\u9023\u4ed8\u3051<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u96c6\u7d04\uff08\u30a2\u30b0\u30ea\u30b2\u30fc\u30b7\u30e7\u30f3\uff09<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5408\u6210 (\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3)<\/ol>\n<p>\u3053\u308c\u3089\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u3092\u4e00\u3064\u305a\u3064\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u793a\u3059\u306e\u3067\u3001Java\u3067OOP\u306e\u6982\u5ff5\u3092\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u304b\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>1. \u62bd\u8c61\u5316 (\u3061\u3085\u3046\u3057\u3087\u3046\u304b)<\/h3>\n<p>\u62bd\u8c61\u5316\uff08\u3061\u3085\u3046\u3057\u3087\u3046\u304b\uff09\u3068\u306f\u3001\u5185\u90e8\u306e\u8a73\u7d30\u3092\u96a0\u3057\u3001\u5358\u7d14\u306a\u5f62\u3067\u7269\u4e8b\u3092\u8868\u73fe\u3059\u308b\u6982\u5ff5\u3067\u3059\u3002\u4f8b\u3048\u3070\u30012\u3064\u306e\u6574\u6570\u3092\u8db3\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u90e8\u51e6\u7406\u306f\u5916\u90e8\u306e\u4e16\u754c\u304b\u3089\u96a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u306f\u3001\u30ab\u30d7\u30bb\u30eb\u5316\u3084\u7d99\u627f\u306a\u3069\u3001\u591a\u304f\u306e\u65b9\u6cd5\u3067\u62bd\u8c61\u5316\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u62bd\u8c61\u5316\u306e\u7d20\u6674\u3089\u3057\u3044\u4f8b\u3067\u3059\u3002\u3053\u3053\u3067\u306fJava\u304c\u7c21\u5358\u306a\u6587\u3092\u6a5f\u68b0\u8a9e\u306b\u5909\u63db\u3057\u3001\u5185\u90e8\u306e\u5b9f\u88c5\u306e\u8a73\u7d30\u3092\u5916\u90e8\u306e\u4e16\u754c\u304b\u3089\u96a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u8a73\u8aad\uff1aOOPS\u306b\u304a\u3051\u308b\u62bd\u8c61\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/p>\n<h3>2. \u30ab\u30d7\u30bb\u30eb\u5316 (Kapuserekka)<\/h3>\n<p>\u30ab\u30d7\u30bb\u30eb\u5316\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u62bd\u8c61\u5316\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u6280\u8853\u3067\u3059\u3002\u30ab\u30d7\u30bb\u30eb\u5316\u306f\u3001\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u30fc\u3084\u30e1\u30bd\u30c3\u30c9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u5236\u9650\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u30ab\u30d7\u30bb\u30eb\u5316\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Java\u3067\u306f\u3001private\u3001protected\u3001public\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30ab\u30d7\u30bb\u30eb\u5316\u304c\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>3. \u591a\u69d8\u6027 (\u305f\u3088\u3046\u305b\u3044)<\/h3>\n<p>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7570\u306a\u308b\u72b6\u6cc1\u3067\u7570\u306a\u308b\u632f\u308b\u821e\u3044\u3092\u3059\u308b\u6982\u5ff5\u3067\u3059\u3002\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306b\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3068\u5b9f\u884c\u6642\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e2\u3064\u306e\u30bf\u30a4\u30d7\u304c\u3042\u308a\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306b\u3088\u3063\u3066\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>public class Circle {\r\n\r\n\tpublic void draw(){\r\n\t\tSystem.out.println(\"Drwaing circle with default color Black and diameter 1 cm.\");\r\n\t}\r\n\t\r\n\tpublic void draw(int diameter){\r\n\t\tSystem.out.println(\"Drwaing circle with default color Black and diameter\"+diameter+\" cm.\");\r\n\t}\r\n\t\r\n\tpublic void draw(int diameter, String color){\r\n\t\tSystem.out.println(\"Drwaing circle with color\"+color+\" and diameter\"+diameter+\" cm.\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u3053\u3067\u306f\u3001\u8907\u6570\u306e\u63cf\u753b\u30e1\u30bd\u30c3\u30c9\u304c\u5b58\u5728\u3057\u307e\u3059\u304c\u3001\u305d\u308c\u3089\u306e\u52d5\u4f5c\u306f\u7570\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u30b1\u30fc\u30b9\u3067\u3042\u308a\u3001\u5168\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d\u304c\u540c\u3058\u3067\u5f15\u6570\u304c\u7570\u306a\u308b\u305f\u3081\u3067\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u547c\u3073\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u8b58\u5225\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u3053\u308c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306b\u300cIS-A\u300d\u306e\u95a2\u4fc2\u304c\u3042\u308b\u5834\u5408\u306b\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304c\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u305f\u3081\u306b\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3053\u3068\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3092\u57fa\u6e96\u306b\u4f5c\u696d\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u5b9f\u969b\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u306f\u30e9\u30f3\u30bf\u30a4\u30e0\u3067\u6c7a\u5b9a\u3055\u308c\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3069\u306e\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u306e\u6c7a\u5b9a\u306f\u30e9\u30f3\u30bf\u30a4\u30e0\u3067\u884c\u308f\u308c\u308b\u305f\u3081\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u307e\u305f\u306f\u52d5\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u3068\u3044\u3046\u540d\u524d\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.test;\r\n\r\npublic interface Shape {\r\n\r\n\tpublic void draw();\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>package com.scdev.test;\r\n\r\npublic class Circle implements Shape{\r\n\r\n\t@Override\r\n\tpublic void draw(){\r\n\t\tSystem.out.println(\"Drwaing circle\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>package com.scdev.test;\r\n\r\npublic class Square implements Shape {\r\n\r\n\t@Override\r\n\tpublic void draw() {\r\n\t\tSystem.out.println(\"Drawing Square\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u5f62\u306f\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u306f\u5186\u3068\u6b63\u65b9\u5f62\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>Shape sh = new Circle();\r\nsh.draw();\r\n\r\nShape sh1 = getShape(); \/\/some third party logic to determine shape\r\nsh1.draw();\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5b9f\u884c\u6642\u306b\u4f7f\u7528\u3055\u308c\u308bShape\u306e\u5b9f\u969b\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u77e5\u308a\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<h3>4. \u76f8\u7d9a (S\u014dzoku)<\/h3>\n<p>\u7d99\u627f\u3068\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u306e\u4e00\u3064\u3067\u3001\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u57fa\u306b\u3057\u3066\u751f\u6210\u3055\u308c\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u7d99\u627f\u306f\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u7d99\u627f\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3068\u547c\u3070\u308c\u3001\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b5\u30d6\u30af\u30e9\u30b9\u3068\u547c\u3070\u308c\u307e\u3059\u3002Java\u3067\u306f\u3001extends\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u7d99\u627f\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306fJava\u306b\u304a\u3051\u308b\u7d99\u627f\u306e\u5358\u7d14\u306a\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.java.examples1;\r\n\r\nclass SuperClassA {\r\n\r\n\tpublic void foo(){\r\n\t\tSystem.out.println(\"SuperClassA\");\r\n\t}\r\n\t\r\n}\r\n\r\nclass SubClassB extends SuperClassA{\r\n\t\t\r\n\tpublic void bar(){\r\n\t\tSystem.out.println(\"SubClassB\");\r\n\t}\r\n\t\r\n}\r\n\r\npublic class Test {\r\n\tpublic static void main(String args[]){\r\n\t\tSubClassB a = new SubClassB();\r\n\t\t\r\n\t\ta.foo();\r\n\t\ta.bar();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<h3>5. \u5354\u4f1a (\u304d\u3087\u3046\u304b\u3044)<\/h3>\n<p>\u95a2\u9023\u4ed8\u3051\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff08OOPS\uff09\u306e\u6982\u5ff5\u3067\u3059\u3002\u95a2\u9023\u4ed8\u3051\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306e\u591a\u91cd\u5ea6\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6559\u5e2b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u5b66\u751f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u95a2\u4fc2\u306f\u4e00\u5bfe\u591a\u306e\u95a2\u4fc2\u3067\u3059\u3002\u540c\u69d8\u306b\u3001\u5b66\u751f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3082\u6559\u5e2b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306e\u4e00\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u6301\u3064\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5b66\u751f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u6559\u5e2b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u304a\u4e92\u3044\u306b\u72ec\u7acb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u96c6\u8a08<\/h3>\n<p>\u96c6\u7d04\u306f\u7279\u5225\u306a\u95a2\u9023\u306e\u4e00\u7a2e\u3067\u3059\u3002\u96c6\u7d04\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u72ec\u81ea\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u6240\u6709\u95a2\u4fc2\u3082\u5b58\u5728\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306b\u300c\u6301\u3063\u3066\u3044\u308b\u300d\u3068\u3044\u3046\u95a2\u4fc2\u3084\u6240\u6709\u95a2\u4fc2\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u308c\u306f\u96c6\u7d04\u306e\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<h3>6. \u4f5c\u6587<br \/>\n\u4f5c\u6210<\/h3>\n<p>\u69cb\u6210\u306f\u3001\u96c6\u7d04\u306e\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u3067\u3059\u3002\u69cb\u6210\u306f\u3001\u3088\u308a\u5236\u7d04\u306e\u3042\u308b\u96c6\u7d04\u306e\u5f62\u5f0f\u3067\u3059\u3002&#8221;HAS-A&#8221;\u306e\u95a2\u4fc2\u3067\u542b\u307e\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5358\u72ec\u3067\u5b58\u5728\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u305d\u308c\u306f\u69cb\u6210\u306e\u30b1\u30fc\u30b9\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u5bb6\u306f\u90e8\u5c4b\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u3001\u90e8\u5c4b\u306f\u5bb6\u306a\u3057\u3067\u306f\u5b58\u5728\u3067\u304d\u307e\u305b\u3093\u3002\u69cb\u6210\u306f\u3001\u7d99\u627f\u3088\u308a\u3082\u512a\u308c\u3066\u3044\u308b\u3068\u8a00\u308f\u308c\u3066\u3044\u307e\u3059\u3002Composition vs Inheritance\u3067\u8a73\u3057\u304f\u8aad\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u8aad\u3080\u3053\u3068: Java\u306b\u304a\u3051\u308b\u30b3\u30f3\u30dd\u30b8\u30b7\u30e7\u30f3<\/p>\n<p>OOPS\u306e\u6982\u5ff5\u306b\u3064\u3044\u3066\u306e\u7c21\u5358\u306a\u307e\u3068\u3081\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n<p>\u5f0a\u793e\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u3055\u3089\u306b\u591a\u304f\u306eJava\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u53c2\u7167\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u53c2\u8003\u6587\u732e: https:\/\/docs.oracle.com\/javase\/tutorial\/java\/concepts\/<\/p>\n<p>\uff08\u4ee5\u4e0b\u306e\u60c5\u5831\u306f\u3001\u4e0a\u8a18URL\u306b\u3042\u308bJava\u306e\u6982\u5ff5\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u53c2\u8003\u306b\u3057\u307e\u3057\u305f\u3002\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6982\u5ff5\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002OOPS\u306e\u6982\u5ff5\u306b\u3064\u3044\u3066\u306e\u7406\u89e3\u304c\u306a\u3051\u308c\u3070\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30e2\u30c7\u30eb\u3067\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-839","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u306b\u304a\u3051\u308bOOPS\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff09\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u306b\u3064\u3044\u3066 - OOPS\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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