{"id":1391,"date":"2012-12-26T18:02:20","date_gmt":"2012-12-26T09:02:20","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=1391"},"modified":"2018-11-14T16:33:57","modified_gmt":"2018-11-14T07:33:57","slug":"%e3%82%aa%e3%83%bc%e3%83%90%e3%83%bc%e3%83%a9%e3%82%a4%e3%83%89%e3%81%a8%e3%82%aa%e3%83%bc%e3%83%90%e3%83%bc%e3%83%ad%e3%83%bc%e3%83%89-java%e7%b7%a8","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2012\/12\/26\/%e3%82%aa%e3%83%bc%e3%83%90%e3%83%bc%e3%83%a9%e3%82%a4%e3%83%89%e3%81%a8%e3%82%aa%e3%83%bc%e3%83%90%e3%83%bc%e3%83%ad%e3%83%bc%e3%83%89-java%e7%b7%a8\/","title":{"rendered":"\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3068\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9 Java\u7de8"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f
\n\u6751\u4e0a\u3067\u3059\u3002<\/p>\n

\u305f\u3076\u3093\u4eca\u5e74\u6700\u5f8c\u306eJava\u30cd\u30bf\u3067\u3059\u3002<\/p>\n

\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3068\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u9055\u3044\u3063\u3066\u77e5\u3063\u3066\u307e\u3059\u304b\uff1f<\/p>\n

\u305d\u3093\u306a\u306e\u5f53\u7136\uff01\uff01<\/strong><\/p>\n

\u3063\u3066\u58f0\u304c\u805e\u3053\u3048\u3066\u304d\u305d\u3046\u3067\u3059\u306d\u3002<\/p>\n

\u3068\u308a\u3042\u3048\u305a\u304a\u3055\u3089\u3044<\/p>\n

\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9<\/h2>\n
\r\n\r\nclass Parent {\r\n\tpublic void hoge() {\r\n\t\tSystem.out.println(\"Parent\");\r\n\t}\r\n}\r\n\r\nclass Child1 extends Parent {\r\n\r\n\t@Override\r\n\tpublic void hoge() {\r\n\t\tSystem.out.println(\"Child1\");\r\n\t}\r\n}\r\n\r\nclass Child2 extends Parent {\r\n\r\n\t@Override\r\n\tpublic void hoge() {\r\n\t\tSystem.out.println(\"Child2\");\r\n\t}\r\n}\r\n<\/pre>\n
\u3063\u3066\u30af\u30e9\u30b9\u304c\u3042\u3063\u305f\u6642\u306b\u4e0b\u8a18\u306e\u5b9f\u884c\u7d50\u679c\u306f<\/p>\n
\r\nParent p = new Parent();\r\np.hoge(); \/\/ \u300cParent\u300d\u3068\u51fa\u529b\r\n\r\nParent c1 = new Child1();\r\nc1.hoge(); \/\/ \u300cChild1\u300d\u3068\u51fa\u529b\r\n\r\nParent c2 = new Child2();\r\nc2.hoge(); \/\/ \u300cChild2\u300d\u3068\u51fa\u529b\r\n<\/pre>\n
\u3067\u3059\u306d\u3002<\/p>\n
\u3064\u307e\u308a\u3001Parent\u30af\u30e9\u30b9\u306ehoge\u30e1\u30bd\u30c3\u30c9\u306fChild1\u3001Child2\u30af\u30e9\u30b9\u3067\u4e0a\u66f8\u304d\u3055\u308c\u308b\u3063\u3066\u3044\u3046\u3053\u3068\u3067\u3059\u3002
\n\u3053\u3053\u306b\u306f\u7d99\u627f\u3084\u3089\u591a\u614b\u6027\u3084\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u7684\u306a\u3053\u3068\u304c\u767a\u751f\u3057\u3066\u3053\u3046\u306a\u308b\u3093\u3067\u3059\u304c\u3001\u305d\u3053\u3089\u8fba\u306f\u6df1\u304f\u306f\u89e6\u308c\u306a\u3044\u3067\u3059\u3002<\/p>\n
\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9<\/h2>\n
\u6b21\u306b\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
\r\npublic void foo(Parent p) {\r\n\tSystem.out.print(\"Call Parent => \");\r\n\tp.hoge();\r\n}\r\npublic void foo(Child1 c1) {\r\n\tSystem.out.print(\"Call Child1 => \");\r\n\tc1.hoge();\r\n}\r\n\r\npublic void foo(Child2 c2) {\r\n\tSystem.out.print(\"Call Child2 => \");\r\n\tc2.hoge();\r\n}\r\n<\/pre>\n
\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u3068\u304d\u4e0b\u8a18\u306e\u5b9f\u884c\u7d50\u679c\u306f<\/p>\n
\r\nParent p = new Parent();\r\nfoo(p); \/\/ \u300cCall Parent => Parent\u300d\u3068\u51fa\u529b\r\n\r\nChild1 c1 = new Child1();\r\nfoo(c1); \/\/ \u300cCall Child1 => Child1\u300d\u3068\u51fa\u529b\r\n\r\nChild2 c2 = new Child2();\r\nfoo(c2); \/\/ \u300cCall Child2 => Child2\u300d\u3068\u51fa\u529b\r\n<\/pre>\n
\u3067\u3059\u306d\u3002<\/p>\n
\u3088\u3046\u3059\u308b\u306bfoo\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u304c\u7570\u306a\u308c\u3070\u591a\u91cd\u5b9a\u7fa9\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u5b9f\u884c\u7d50\u679c\u306f\uff1f<\/h2>\n
\u3067\u306f\u6b21\u306e\u5b9f\u884c\u7d50\u679c\u306f\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\r\nParent cp1 = new Child1();\r\nfoo(cp1);\r\n\r\nParent cp2 = new Child2();\r\nfoo(cp2);\r\n<\/pre>\n
\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3068\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u6df7\u5408\u6280\u3067\u3059\u3002<\/p>\n
cp1\u3001cp2\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5b9f\u614b\u306fChild1\u3001Child2\u3067\u3059\u3002\u305d\u3057\u3066\u3001\u591a\u614b\u6027\u3092\u5229\u7528\u3057\u3066Parent\u3067\u5ba3\u8a00\u3055\u308c\u3066\u307e\u3059\u3002
\nfoo\u30e1\u30bd\u30c3\u30c9\u306f\u5f15\u6570\u304cParent\u3001Child1\u3001Child2\u3067\u591a\u91cd\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\n\u4f55\u304c\u51fa\u529b\u3055\u308c\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u5b9f\u884c\u7d50\u679c\u306f<\/p>\n
\r\nParent cp1 = new Child1();\r\nfoo(cp1); \/\/ Call Parent => Child1\r\n\r\nParent cp2 = new Child2();\r\nfoo(cp2); \/\/ Call Parent => Child2\r\n<\/pre>\n
\u7d50\u679c\u3082\u6df7\u5408\u3067\u3059\u306d\u3002<\/p>\n
\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u5074\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fParent\u3068\u8a8d\u8b58\u3055\u308c\u3001\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u5074\u306fChild1\u3001Child2\u3068\u8a8d\u8b58\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u3068\u3044\u3046\u3068\u3001\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u304c\u6c7a\u307e\u308a\u3001\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u306f\u5b9f\u884c\u6642\u306b\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u304c\u6c7a\u307e\u308b\u304b\u3089\u3067\u3059\u3002
\ncp1\u3082cp2\u3082\u5ba3\u8a00\u306fParent\u306a\u306e\u3067\u3001\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306ffoo\u306e\u5f15\u6570\u304cParent\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u307e\u3059\u3002
\n\u307e\u305f\u3001\u5b9f\u884c\u6642\u3064\u307e\u308a\u5b9f\u614b\u306fChild1\u304a\u3088\u3073Child2\u306b\u306a\u308b\u306e\u3067\u3001\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u306f\u305d\u308c\u305e\u308c\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3068\u304f\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u306f\u7121\u3044\u3067\u3059\u304c\u3001\u6614\u3053\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u601d\u3063\u305f\u5b9f\u884c\u7d50\u679c\u306b\u306a\u3089\u306a\u3044\u306e\u3067\u3001\u8abf\u3079\u305f\u5185\u5bb9\u3067\u3059\u3002
\n\u307e\u3041\u3001\u30c6\u30b9\u30c8\u3059\u308c\u3070\u601d\u3063\u305f\u52d5\u304d\u3092\u3057\u306a\u3044\u306e\u3067\u767a\u898b\u3055\u308c\u305a\u306b\u4e0d\u5177\u5408\u306b\u81f3\u308b\u3053\u3068\u306f\u591a\u5206\u306a\u3044\u3067\u3059\u304c\u3001\u306a\u305c\u304b\u308f\u304b\u3089\u305a\u30cf\u30de\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
Java\u306e\u3061\u3087\u3063\u3068\u3057\u305f\u96d1\u5b66\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u73fe\u5834\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u4eba\u306b\u805e\u3044\u3066\u307f\u3066\u4e0b\u3055\u3044\u3002
\n\u307f\u306a\u3055\u3093\u610f\u5916\u3068\u77e5\u3089\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f
\n\u6751\u4e0a\u3067\u3059\u3002<\/p>\n
\u305f\u3076\u3093\u4eca\u5e74\u6700\u5f8c\u306eJava\u30cd\u30bf\u3067\u3059\u3002<\/p>\n
\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3068\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u9055\u3044\u3063\u3066\u77e5\u3063\u3066\u307e\u3059\u304b\uff1f<\/p>\n
\u305d\u3093\u306a\u306e\u5f53\u7136\uff01\uff01<\/p>\n
\u3063\u3066\u58f0\u304c\u805e\u3053\u3048\u3066\u304d\u305d\u3046\u3067\u3059\u306d\u3002
\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[57],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1391"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=1391"}],"version-history":[{"count":1,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1391\/revisions"}],"predecessor-version":[{"id":17988,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1391\/revisions\/17988"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=1391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=1391"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=1391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}