{"id":2024,"date":"2022-02-17T16:37:08","date_gmt":"2022-02-17T08:37:08","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2024"},"modified":"2022-02-17T16:59:29","modified_gmt":"2022-02-17T08:59:29","slug":"%e7%8a%b6%e6%80%81%e6%a8%a1%e5%bc%8f%e5%92%8c%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2024","title":{"rendered":"\u72b6\u6001\u6a21\u5f0f\u548c\u7b56\u7565\u6a21\u5f0f"},"content":{"rendered":"\n<p>\u8fd9\u4e24\u4e2a\u6a21\u5f0f\u5e38\u5e38\u53ef\u4ee5\u62ff\u6765\u505a\u5bf9\u6bd4\uff0c\u4e24\u4e2a\u6bd4\u8f83\u76f8\u4f3c\u3002<\/p>\n\n\n\n<p>\u72b6\u6001\u6a21\u5f0f\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5b9a\u4e49\u597d\u7684\u72b6\u6001\uff0c\u5982\u679c\u72b6\u6001\u53d8\u5316\uff0c\u90a3\u4e48\u540e\u7eed\u7684\u64cd\u4f5c\u662f\u56fa\u5b9a\u7684\uff0c\u662f\u201c\u81ea\u52a8\u201d\u7684\uff0c\u201c\u65e0\u611f\u77e5\u201d\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709\u4e00\u4e2a\u7b56\u7565\u7684\u9009\u62e9\uff0c\u800c\u662f\u72b6\u6001\u6d41\u8f6c\u65f6\u5019\uff0c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">\u8fd9\u4e2a\u72b6\u6001\u4e0b\u6709\u54ea\u4e9b\u53ef\u884c\u7684\u64cd\u4f5c\u662f\u56fa\u5b9a\u7684\u3002<\/mark><\/p>\n\n\n\n<p>\u7b56\u7565\u6a21\u5f0f\u4e3b\u8981\u662f\u5bf9\u7b97\u6cd5\uff08\u7b56\u7565\uff09\u7684\u5c01\u88c5\uff0c\u5728\u4e0d\u540c\u573a\u666f\u4e0b\uff0c\u9009\u7528\u4e0d\u540c\u7684\u7b97\u6cd5\uff0c\u4f7f\u7528\u7684\u662fsetStrategy(xxx)\uff0c\u6765\u8bbe\u7f6e\u67d0\u79cd\u7b56\u7565\uff0c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">\u8fd9\u4e2a\u7b56\u7565\u5c31\u662f\u4e00\u6574\u4e2a\u5b8c\u6574\u7684\u6d41\u7a0b\u52a8\u4f5c\u3002<\/mark><\/p>\n\n\n\n<p><a href=\"https:\/\/www.runoob.com\/design-pattern\/state-pattern.html\">\u72b6\u6001\u6a21\u5f0f | \u83dc\u9e1f\u6559\u7a0b (runoob.com)<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.runoob.com\/design-pattern\/strategy-pattern.html\">\u7b56\u7565\u6a21\u5f0f | \u83dc\u9e1f\u6559\u7a0b (runoob.com)<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.runoob.com\/w3cnote\/state-vs-strategy.html\">\u7b56\u7565\u6a21\u5f0f VS \u72b6\u6001\u6a21\u5f0f | \u83dc\u9e1f\u6559\u7a0b (runoob.com)<\/a><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u72b6\u6001\u6a21\u5f0f\n\n\u610f\u56fe\uff1a\u5141\u8bb8\u5bf9\u8c61\u5728\u5185\u90e8\u72b6\u6001\u53d1\u751f\u6539\u53d8\u65f6\u6539\u53d8\u5b83\u7684\u884c\u4e3a\uff0c\u5bf9\u8c61\u770b\u8d77\u6765\u597d\u50cf\u4fee\u6539\u4e86\u5b83\u7684\u7c7b\u3002\n\n\u4e3b\u8981\u89e3\u51b3\uff1a\u5bf9\u8c61\u7684\u884c\u4e3a\u4f9d\u8d56\u4e8e\u5b83\u7684\u72b6\u6001\uff08\u5c5e\u6027\uff09\uff0c\u5e76\u4e14\u53ef\u4ee5\u6839\u636e\u5b83\u7684\u72b6\u6001\u6539\u53d8\u800c\u6539\u53d8\u5b83\u7684\u76f8\u5173\u884c\u4e3a\u3002\n\n\u4f55\u65f6\u4f7f\u7528\uff1a\u4ee3\u7801\u4e2d\u5305\u542b\u5927\u91cf\u4e0e\u5bf9\u8c61\u72b6\u6001\u6709\u5173\u7684\u6761\u4ef6\u8bed\u53e5\u3002\n\n\u5982\u4f55\u89e3\u51b3\uff1a\u5c06\u5404\u79cd\u5177\u4f53\u7684\u72b6\u6001\u7c7b\u62bd\u8c61\u51fa\u6765\u3002\n\n\u4f18\u70b9\uff1a 1\u3001\u5c01\u88c5\u4e86\u8f6c\u6362\u89c4\u5219\u3002 2\u3001\u679a\u4e3e\u53ef\u80fd\u7684\u72b6\u6001\uff0c\u5728\u679a\u4e3e\u72b6\u6001\u4e4b\u524d\u9700\u8981\u786e\u5b9a\u72b6\u6001\u79cd\u7c7b\u3002 3\u3001\u5c06\u6240\u6709\u4e0e\u67d0\u4e2a\u72b6\u6001\u6709\u5173\u7684\u884c\u4e3a\u653e\u5230\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u5e76\u4e14\u53ef\u4ee5\u65b9\u4fbf\u5730\u589e\u52a0\u65b0\u7684\u72b6\u6001\uff0c\u53ea\u9700\u8981\u6539\u53d8\u5bf9\u8c61\u72b6\u6001\u5373\u53ef\u6539\u53d8\u5bf9\u8c61\u7684\u884c\u4e3a\u3002 4\u3001\u5141\u8bb8\u72b6\u6001\u8f6c\u6362\u903b\u8f91\u4e0e\u72b6\u6001\u5bf9\u8c61\u5408\u6210\u4e00\u4f53\uff0c\u800c\u4e0d\u662f\u67d0\u4e00\u4e2a\u5de8\u5927\u7684\u6761\u4ef6\u8bed\u53e5\u5757\u3002 5\u3001\u53ef\u4ee5\u8ba9\u591a\u4e2a\u73af\u5883\u5bf9\u8c61\u5171\u4eab\u4e00\u4e2a\u72b6\u6001\u5bf9\u8c61\uff0c\u4ece\u800c\u51cf\u5c11\u7cfb\u7edf\u4e2d\u5bf9\u8c61\u7684\u4e2a\u6570\u3002\n\n\u7f3a\u70b9\uff1a 1\u3001\u72b6\u6001\u6a21\u5f0f\u7684\u4f7f\u7528\u5fc5\u7136\u4f1a\u589e\u52a0\u7cfb\u7edf\u7c7b\u548c\u5bf9\u8c61\u7684\u4e2a\u6570\u3002 2\u3001\u72b6\u6001\u6a21\u5f0f\u7684\u7ed3\u6784\u4e0e\u5b9e\u73b0\u90fd\u8f83\u4e3a\u590d\u6742\uff0c\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\u5c06\u5bfc\u81f4\u7a0b\u5e8f\u7ed3\u6784\u548c\u4ee3\u7801\u7684\u6df7\u4e71\u3002 3\u3001\u72b6\u6001\u6a21\u5f0f\u5bf9\"\u5f00\u95ed\u539f\u5219\"\u7684\u652f\u6301\u5e76\u4e0d\u592a\u597d\uff0c\u5bf9\u4e8e\u53ef\u4ee5\u5207\u6362\u72b6\u6001\u7684\u72b6\u6001\u6a21\u5f0f\uff0c\u589e\u52a0\u65b0\u7684\u72b6\u6001\u7c7b\u9700\u8981\u4fee\u6539\u90a3\u4e9b\u8d1f\u8d23\u72b6\u6001\u8f6c\u6362\u7684\u6e90\u4ee3\u7801\uff0c\u5426\u5219\u65e0\u6cd5\u5207\u6362\u5230\u65b0\u589e\u72b6\u6001\uff0c\u800c\u4e14\u4fee\u6539\u67d0\u4e2a\u72b6\u6001\u7c7b\u7684\u884c\u4e3a\u4e5f\u9700\u4fee\u6539\u5bf9\u5e94\u7c7b\u7684\u6e90\u4ee3\u7801\u3002\n\n\u4f7f\u7528\u573a\u666f\uff1a 1\u3001\u884c\u4e3a\u968f\u72b6\u6001\u6539\u53d8\u800c\u6539\u53d8\u7684\u573a\u666f\u3002 2\u3001\u6761\u4ef6\u3001\u5206\u652f\u8bed\u53e5\u7684\u4ee3\u66ff\u8005\u3002\n\n\u6ce8\u610f\u4e8b\u9879\uff1a\u5728\u884c\u4e3a\u53d7\u72b6\u6001\u7ea6\u675f\u7684\u65f6\u5019\u4f7f\u7528\u72b6\u6001\u6a21\u5f0f\uff0c\u800c\u4e14\u72b6\u6001\u4e0d\u8d85\u8fc7 5 \u4e2a\u3002\n\n\n\u4e0a\u9762\u6587\u7ae0\u4e2d\uff0c\u7cd6\u679c\u673a\u7684\u4f8b\u5b50\u5c31\u5f88\u597d\uff0c\u663e\u793a\u4f7f\u7528if else\u6765\u5904\u7406\u6574\u4e2a\u6d41\u7a0b\uff0c\u7136\u540e\u4f7f\u7528\u72b6\u6001\u6a21\u5f0f\u6765\u6539\u5199\u3002\n\n<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">\u6539\u5199\u524d\uff0c\u6295\u5e01\u8fd9\u4e2a\u52a8\u4f5c\uff0c\u4f1a\u5224\u65ad\u4e0d\u540c\u7684\u72b6\u6001\uff0c\u6765\u505a\u4e0d\u540c\u7684\u5904\u7406<\/mark>\n    \/**\n     * \u6295\u5e01\n     *\/\n    public void insertQuarter() {\n        if(NO_QUARTER == state){\n            System.out.println(\"\u6295\u5e01\");\n            state = HAS_QUARTER;\n        }\n        else if(HAS_QUARTER == state){\n            System.out.println(\"\u8bf7\u4e0d\u8981\u91cd\u590d\u6295\u5e01\uff01\");\n            returnQuarter();\n        }\n        else if(SOLD == state){\n            System.out.println(\"\u5df2\u6295\u5e01\uff0c\u8bf7\u7b49\u5f85\u7cd6\u679c\");\n            returnQuarter();\n        }else if(SOLD_OUT == state){\n            System.out.println(\"\u7cd6\u679c\u5df2\u7ecf\u552e\u5c3d\");\n            returnQuarter();\n        }\n    }\n\n<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">\u6539\u5199\u540e\uff0c\u6bcf\u4e2a\u72b6\u6001\u90fd\u4f1a\u6709\u4e00\u4e2a\u6295\u5e01\u7684\u52a8\u4f5c\uff0c\u4f46\u662f\u6295\u5e01\u7684\u52a8\u4f5c\u4ea7\u751f\u7684\u7ed3\u679c\u662f\u4e0d\u540c\u7684<\/mark>\npublic abstract class State {\n    \/**\n     * \u6295\u5e01\n     *\/\n    <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">public abstract void insertQuarter();<\/mark>\n\n    \/**\n     * \u9000\u5e01\n     *\/\n    public abstract void ejectQuarter();\n\n    \/**\n     * \u8f6c\u52a8\u51fa\u7cd6\u66f2\u8f74\n     *\/\n    public abstract void turnCrank();\n\n    \/**\n     * \u53d1\u7cd6\n     *\/\n    public abstract void dispense();\n\n    \/**\n     * \u9000\u8fd8\u786c\u5e01\n     *\/\n    protected void returnQuarter() {\n        System.out.println(\"\u9000\u5e01\u2026\u2026\");\n    }\n}\n\n<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-bright-red-color\">\u7b80\u5355\u7684\u7406\u89e3\uff0cif else\u662f\u5728\u52a8\u4f5c\u91cc\u9762\uff0c\u5224\u65ad\u72b6\u6001\uff0c\u6bcf\u4e2a\u72b6\u6001\u89e6\u53d1\u540e\u7ed3\u679c\u4e0d\u540c\uff0c\u72b6\u6001\u6a21\u5f0f\u662f\u5728\u7279\u5b9a\u72b6\u6001\u4e0b\u9762\u89e6\u53d1\u52a8\u4f5c\uff0c\u8fd9\u4e2a\u52a8\u4f5c\u4f1a\u4ea7\u751f\u4ec0\u4e48\u7ed3\u679c\u5df2\u7ecf\u88ab\u63d0\u524d\u56fa\u5b9a\u4e0b\u6765\u4e86\u3002<\/mark>\n<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">\u7b56\u7565\u6a21\u5f0f\u7684\u4f8b\u5b50\n\n\u521b\u5efa\u4e00\u4e2a\u63a5\u53e3\nStrategy.java\npublic interface Strategy {\n   public int doOperation(int num1, int num2);\n}\n\n\n\u521b\u5efa\u5b9e\u73b0\u63a5\u53e3\u7684\u5b9e\u4f53\u7c7b\u3002\nOperationAdd.java\npublic class OperationAdd implements Strategy{\n   @Override\n   public int doOperation(int num1, int num2) {\n      return num1 + num2;\n   }\n}\n\nOperationSubtract.java\npublic class OperationSubtract implements Strategy{\n   @Override\n   public int doOperation(int num1, int num2) {\n      return num1 - num2;\n   }\n}\n\nOperationMultiply.java\npublic class OperationMultiply implements Strategy{\n   @Override\n   public int doOperation(int num1, int num2) {\n      return num1 * num2;\n   }\n}\n\n\u4e0a\u4e0b\u95ee\uff0c\u5b9e\u73b0\u5bf9\u7b56\u7565\u7684\u8bbe\u7f6e\npublic class Context {\n   private Strategy strategy;\n \n   public Context(){\n      \n   }\n\n   public SetStrategy(Strategy strategy){\n      this.strategy = strategy;\n   }\n\n   public int executeStrategy(int num1, int num2){\n      return strategy.doOperation(num1, num2);\n   }\n}\n\n\u8c03\u7528\uff1a\npublic static void main(String[] args) {\n      Context context = new Context();    \n      context.SetStrategy(new OperationAdd());    \n      System.out.println(\"10 + 5 = \" + context.executeStrategy(10, 5));\n      context.SetStrategy(new OperationSubtract());    \n      System.out.println(\"10 - 5 = \" + context.executeStrategy(10, 5));\n      context.SetStrategy(new OperationMultiply());          System.out.println(\"10 * 5 = \" + context.executeStrategy(10, 5));\n}\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e24\u4e2a\u6a21\u5f0f\u5e38\u5e38\u53ef\u4ee5\u62ff\u6765\u505a\u5bf9\u6bd4\uff0c\u4e24\u4e2a\u6bd4\u8f83\u76f8\u4f3c\u3002 \u72b6\u6001\u6a21\u5f0f\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5b9a\u4e49\u597d\u7684\u72b6\u6001\uff0c\u5982\u679c\u72b6\u6001\u53d8\u5316\uff0c\u90a3\u4e48\u540e\u7eed\u7684\u64cd\u4f5c\u662f\u56fa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131],"tags":[],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2024"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2024"}],"version-history":[{"count":24,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2024\/revisions"}],"predecessor-version":[{"id":2048,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2024\/revisions\/2048"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}