{"id":974,"date":"2023-07-08T15:44:30","date_gmt":"2022-09-01T07:55:11","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%8b%e6%8a%bd%e8%b1%a1%e3%82%af%e3%83%a9%e3%82%b9\/"},"modified":"2025-08-01T03:58:18","modified_gmt":"2025-07-31T18:58:18","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e6%8a%bd%e8%b1%a1%e3%82%af%e3%83%a9%e3%82%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e6%8a%bd%e8%b1%a1%e3%82%af%e3%83%a9%e3%82%b9\/","title":{"rendered":"Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u30af\u30e9\u30b9"},"content":{"rendered":"<p>Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5\u3092\u542b\u3080\u3053\u3068\u3092\u9664\u3051\u3070\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u672c\u4f53\u306e\u306a\u3044\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u3001\u5b9f\u88c5\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002abstract\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u62bd\u8c61\u30af\u30e9\u30b9\u3068\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Java\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u4e3b\u306b\u30b5\u30d6\u30af\u30e9\u30b9\u304c\u62e1\u5f35\u3057\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3001\u62bd\u8c61\u30af\u30e9\u30b9\u5185\u306e\u5b9f\u88c5\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u307e\u305f\u306f\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u57fa\u76e4\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u30af\u30e9\u30b9<\/h2>\n<p>\u4ee5\u4e0b\u306f\u3001Java\u3067\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306e\u7c21\u5358\u306a\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design;\r\n\r\n\/\/abstract class\r\npublic abstract class Person {\r\n\t\r\n\tprivate String name;\r\n\tprivate String gender;\r\n\t\r\n\tpublic Person(String nm, String gen){\r\n\t\tthis.name=nm;\r\n\t\tthis.gender=gen;\r\n\t}\r\n\t\r\n\t\/\/abstract method\r\n\tpublic abstract void work();\r\n\t\r\n\t@Override\r\n\tpublic String toString(){\r\n\t\treturn \"Name=\"+this.name+\"::Gender=\"+this.gender;\r\n\t}\r\n\r\n\tpublic void changeName(String newName) {\r\n\t\tthis.name = newName;\r\n\t}\t\r\n}\r\n<\/code><\/pre>\n<p>work()\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u306f\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u672c\u4f53\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306fJava\u306b\u304a\u3044\u3066\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u5177\u8c61\u30af\u30e9\u30b9\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.design;\r\n\r\npublic class Employee extends Person {\r\n\t\r\n\tprivate int empId;\r\n\t\r\n\tpublic Employee(String nm, String gen, int id) {\r\n\t\tsuper(nm, gen);\r\n\t\tthis.empId=id;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void work() {\r\n\t\tif(empId == 0){\r\n\t\t\tSystem.out.println(\"Not working\");\r\n\t\t}else{\r\n\t\t\tSystem.out.println(\"Working as employee!!\");\r\n\t\t}\r\n\t}\r\n\t\r\n\tpublic static void main(String args[]){\r\n\t\t\/\/coding in terms of abstract classes\r\n\t\tPerson student = new Employee(\"Dove\",\"Female\",0);\r\n\t\tPerson employee = new Employee(\"Pankaj\",\"Male\",123);\r\n\t\tstudent.work();\r\n\t\temployee.work();\r\n\t\t\/\/using method implemented in abstract class - inheritance\r\n\t\temployee.changeName(\"Pankaj Kumar\");\r\n\t\tSystem.out.println(employee.toString());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306e\u65e5\u672c\u8a9e\u8a33\u3092\u63d0\u4f9b\u3044\u305f\u3057\u307e\u3059\uff081\u3064\u306e\u9078\u629e\u80a2\u306e\u307f\uff09\uff1a<br \/>\nJava\u306b\u304a\u3044\u3066\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306eEmployee\u306f\u7d99\u627f\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306ePerson\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3059\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001Employee\u30af\u30e9\u30b9\u3067Override\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u306b\u3082\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u969b\u306b\u5e38\u306bOverride\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u3079\u304d\u7406\u7531\u306b\u3064\u3044\u3066\u306f\u3001\u8a73\u7d30\u3092\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u30af\u30e9\u30b9\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Java\u3067\u306f\u3001abstract\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Java\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3067\u304d\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u62bd\u8c61\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u672c\u4f53\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30af\u30e9\u30b9\u306b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u30af\u30e9\u30b9\u306f\u62bd\u8c61\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u62bd\u8c61\u30af\u30e9\u30b9\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u62bd\u8c61\u30af\u30e9\u30b9\u306b\u306f\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5ba3\u8a00\u3057\u306a\u304f\u3066\u3082\u69cb\u3044\u307e\u305b\u3093\u3002\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5ba3\u8a00\u3057\u306a\u3044\u30af\u30e9\u30b9\u3067\u3082\u3001\u62bd\u8c61\u3068\u3057\u3066\u30de\u30fc\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u62bd\u8c61\u30af\u30e9\u30b9\u306b\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u304c\u306a\u3044\u5834\u5408\u306f\u3001Java\u3067\u306f\u8907\u6570\u306e\u30af\u30e9\u30b9\u306e\u7d99\u627f\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u304c\u3088\u3044\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Java\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304c\u62bd\u8c61\u30af\u30e9\u30b9\u3067\u306a\u3044\u9650\u308a\u3001\u3059\u3079\u3066\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u3067\u306a\u3044\u9650\u308a\u3001\u6697\u9ed9\u7684\u306b\u62bd\u8c61\u3067\u3059\u3002Java 8\u3067\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001Java 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5909\u66f4\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Java\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u305b\u305a\u306b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Java\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u5171\u901a\u306e\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u3001\u307e\u305f\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>main()\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308c\u3070\u3001\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4ed6\u306e\u30af\u30e9\u30b9\u3068\u540c\u69d8\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<p>\u3053\u308c\u304cJava\u306e\u62bd\u8c61\u30af\u30e9\u30b9\u306b\u95a2\u3059\u308b\u3059\u3079\u3066\u3067\u3059\u3002\u3082\u3057\u4f55\u304b\u91cd\u8981\u306a\u70b9\u3092\u898b\u843d\u3068\u3057\u3066\u3044\u305f\u3089\u3001\u30b3\u30e1\u30f3\u30c8\u3067\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306b\u304a\u3051\u308b\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5\u3092\u542b\u3080\u3053\u3068\u3092\u9664\u3051\u3070\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u62bd\u8c61\u30af\u30e9\u30b9\u306f\u3001\u672c\u4f53\u306e\u306a\u3044\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u3001\u5b9f\u88c5\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3082\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002abstract\u30ad\u30fc\u30ef 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