{"id":973,"date":"2019-12-14T14:13:42","date_gmt":"2019-12-14T06:13:42","guid":{"rendered":"http:\/\/47.101.202.111\/?p=973"},"modified":"2022-01-20T01:23:56","modified_gmt":"2022-01-19T17:23:56","slug":"design-patterns","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=973","title":{"rendered":"\u4e8b\u534a\u529f\u500d – \u4f7f\u7528\u8bbe\u8ba1\u6a21\u5f0f\u5b9e\u73b0\u4ee3\u7801\u590d\u7528"},"content":{"rendered":"

\u76ee\u6807\u548c\u57fa\u672c\u539f\u5219<\/h3>\n

\u7c7b\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u8fdb\u884c\u6700\u5c11\u7684\u4fee\u6539
\n\u7ee7\u627f\u4e0d\u53d8\u90e8\u5206\uff0c\u5c01\u88c5\u53d8\u5316\u90e8\u5206
\n\u7236\u7c7b\u7684\u4fee\u6539\u5c06\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u5b50\u7c7b
\n\u5c3d\u91cf\u4e0d\u52a8\u9ad8\u5c42\u8bbe\u8ba1\uff0c\u800c\u6539\u52a8\u4f4e\u5c42\u5b9e\u73b0\uff08\u63d0\u9ad8\u4e86\u590d\u7528\u6027\uff09<\/p>\n

\u6211\u4eec\u80fd\u4f7f\u7528\u7684\u5de5\u5177<\/h3>\n
\n\u62bd\u8c61\u7c7b\uff08abstract\uff09\u53ca\u7ee7\u627f\uff08extends\uff09\n\u63a5\u53e3\uff08interface\uff09\u53ca\u5b9e\u73b0\uff08implements\uff09\n\u591a\u6001\n<\/pre>\n
\u7b56\u7565\u6a21\u5f0f<\/h2>\n
\u95ee\u9898\u63d0\u51fa<\/h3>\n
\u7c7b\u9700\u8981\u6dfb\u52a0\u65b0\u65b9\u6cd5change()\uff0c\u4e14\u4e0d\u540c\u5b50\u7c7b\u4e2d\u8be5\u65b9\u6cd5\u7684\u5b9e\u73b0\u4e0d\u540c<\/p>\n
\npublic class O {\n    public void steady() { \/\/ steady body } \/\/ \u539f\u6709\u65b9\u6cd5\n}\npublic class O1 extends O {}\npublic class O2 extends O {}\n<\/pre>\n
\u89e3\u51b3\u65b9\u6848\u6bd4\u8f83<\/h3>\n
1\u3001\u4f20\u53c2\u6761\u4ef6\u5206\u652f<\/h4>\n
\u5b9e\u73b0<\/strong> \u7236\u7c7b\u4e2d\u65b0\u589e\u6269\u5145\u65b9\u6cd5change()\uff0c\u65b9\u6cd5\u4f53\u6839\u636e\u53c2\u6570\u51b3\u5b9a\u552f\u4e00\u5206\u652f\uff0c\u5206\u652f\u5bf9\u5e94\u4e0d\u540c\u5b50\u7c7b\u65b9\u6cd5\u5b9e\u73b0
\n\u597d\u5904<\/strong> \u6613\u4e8e\u5b9e\u73b0
\n\u574f\u5904<\/strong> \u2460\u5206\u652f\u8f83\u591a\u65f6\u65b9\u6cd5\u4f53\u8fc7\u5927\u4e0d\u6613\u7ef4\u62a4\u2461change\u6bcf\u6b21\u6269\u5145\u90fd\u9700\u8981\u53d8\u52a8\u6e90\u7c7b\uff08\u9ad8\u5c42\u8bbe\u8ba1\uff09\u2462O2\u5b50\u7c7b\u7ee7\u627f\u4e86\u4e0d\u9700\u8981\u7684\u5206\u652f\u4ee3\u7801change1\u2463\u4f20\u53c2\u9519\u8bef\u65f6\u53ef\u80fd\u8d70\u5411\u9519\u8bef\u5206\u652f<\/p>\n
\npublic class O {\n    \/\/ \u539f\u6709\u65b9\u6cd5\n    public void steady() {\n        \/\/ steady body\n    }\n    \/\/ *\u6269\u5145\u65b9\u6cd5\n    public void change(String s) {\n        if     (\"change0\".equals(s)) {                 }\n        else if(\"change1\".equals(s)) { \/\/ change1 body }\n        else   (\"change2\".equals(s)) { \/\/ change2 body }\n    }\n}\n<\/pre>\n
2\u3001\u5b50\u7c7b\u8986\u5199\u6269\u5145\u65b9\u6cd5<\/h4>\n
\u5b9e\u73b0<\/strong> \u7236\u7c7b\u4e2d\u65b0\u589e\u6269\u5145\u65b9\u6cd5change()\uff0c\u65b9\u6cd5\u4f53\u4e3a\u7a7a\uff0c\u7531\u5404\u5b50\u7c7b\u8986\u5199\u5404\u81ea\u7684change()\u65b9\u6cd5
\n\u597d\u5904<\/strong> \u2460\u7531\u4f4e\u5c42\u5b9e\u73b0\u51b3\u5b9a\u884c\u4e3a\uff0c\u51cf\u5c11\u4e86\u9ad8\u5c42\u8bbe\u8ba1\u7684\u6539\u52a8\uff0c\u63d0\u9ad8\u4e86\u9ad8\u5c42\u8bbe\u8ba1\u7684\u53ef\u590d\u7528\u6027\u2461\u5404\u5b50\u7c7b\u4ec5\u6301\u6709\u81ea\u5df1\u7684\u4ee3\u7801\u5b9e\u73b0\uff0c\u7ed3\u6784\u6761\u7406\u2462\u590d\u7528\u6027\u548c\u7ef4\u62a4\u6027\uff0c\u516c\u5171\u90e8\u5206\u53ef\u63d0\u51fa\u81f3\u7236\u7c7bchange()\uff0c\u4fee\u6539\u53ef\u5bf9\u6240\u6709\u5b50\u7c7b\u751f\u6548
\n\u574f\u5904<\/strong> \u2460\u6539\u52a8\u4f7f\u6240\u6709\u5b50\u7c7b\u5747\u62e5\u6709\u65b9\u6cd5change()\uff0c\u5305\u62ec\u4e0d\u5e94\u8be5\u6709\u6b64\u65b9\u6cd5\u7684\u5b50\u7c7b\u2461\u65e0\u9700change()\u7684\u5b50\u7c7b\u5747\u8981\u8986\u5199\u7a7a\u65b9\u6cd5\u4f53\uff0c\u9020\u6210\u4e86\u4ee3\u7801\u91cd\u590d<\/p>\n
\npublic class O {\n    public void steady() { \/\/ steady body } \/\/ \u539f\u6709\u65b9\u6cd5\n    public void change() {                } \/\/ *\u6269\u5145\u65b9\u6cd5\n}\n\npublic class O1 extends O{\n    @Override\n    public void change() {\n        \/\/ change1 body\n    }\n}\n\npublic class O2 extends O implements Changeable {\n    @Override\n    public void change() {} \/\/ O2\u4e0d\u9700\u8981change()\u65b9\u6cd5\n}\n<\/pre>\n
3\u3001\u5c06\u65b9\u6cd5\u62bd\u8c61\u4e3a\u63a5\u53e3<\/h4>\n
\u5b9e\u73b0<\/strong> \u4ec5\u5c06\u53d1\u751f\u53d8\u5316\u7684\u65b9\u6cd5\u4ece\u6e90\u7c7b\u63d0\u51fa\u81f3\u63a5\u53e3\uff0c\u4e0d\u53d8\u7684\u90e8\u5206\u5b50\u7c7b\u4ecd\u7ee7\u627f\u6e90\u7c7b
\n\u597d\u5904<\/strong> \u62e5\u6709\u4e0a\u8ff0[2\u3001\u7ee7\u627f\u8986\u5199]\u7684\u6240\u6709\u597d\u5904\uff0c\u4e14\u4e0d\u4f1a\u56e0\u53d8\u52a8\u800c\u6539\u53d8\u6240\u6709\u5b50\u7c7b\uff0c\u8fd8\u63d0\u4f9b\u4e86\u7075\u6d3b\u6027\uff1a\u4ec5\u9700\u8981\u8be5\u65b9\u6cd5\u7684\u5b50\u7c7b\u5b9e\u73b0\u63a5\u53e3\uff0c\u4e0d\u9700\u8981\u4e0d\u5b9e\u73b0\u63a5\u53e3
\n\u574f\u5904<\/strong> \u63a5\u53e3\u4e0d\u80fd\u5b9e\u73b0\uff0c\u5931\u53bb[2\u3001\u7ee7\u627f\u8986\u5199]\u7684\u597d\u5904\u2462\uff0c\u4f7f\u5404\u5b50\u7c7b\u5b9e\u73b0\u7684\u5171\u540c\u90e8\u5206\u91cd\u590d\uff0c\u4e14\u5bf9\u5171\u540c\u90e8\u5206\u7684\u4fee\u6539\u8981\u4f9d\u6b21\u4fee\u6539\u6240\u6709\u5b50\u7c7b<\/p>\n
\npublic interface Changeable {\n    public void change();\n}\n\npublic class O1 extends O implements Changeable {\n    @Override\n    public void change() {\n        \/\/ change1 body\n    }\n}\n\npublic class O2 extends O implements Changeable {\n    @Override\n    public void change() {} \/\/ O2\u4e0d\u9700\u8981change()\u65b9\u6cd5\n}\n<\/pre>\n
\u7b56\u7565\u6a21\u5f0f<\/h3>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u6807\u548c\u57fa\u672c\u539f\u5219 \u7c7b\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u8fdb\u884c\u6700\u5c11\u7684\u4fee\u6539 \u7ee7\u627f\u4e0d\u53d8\u90e8\u5206\uff0c\u5c01\u88c5\u53d8\u5316\u90e8\u5206 \u7236\u7c7b\u7684\u4fee\u6539\u5c06\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u5b50\u7c7b \u5c3d\u91cf\u4e0d … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201c\u4e8b\u534a\u529f\u500d – \u4f7f\u7528\u8bbe\u8ba1\u6a21\u5f0f\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[31],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/973"}],"collection":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=973"}],"version-history":[{"count":13,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/973\/revisions"}],"predecessor-version":[{"id":2120,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/973\/revisions\/2120"}],"wp:attachment":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=973"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}