{"id":2278,"date":"2021-03-11T12:10:52","date_gmt":"2021-03-11T04:10:52","guid":{"rendered":"http:\/\/47.101.202.111\/?p=2278"},"modified":"2022-08-25T12:35:06","modified_gmt":"2022-08-25T04:35:06","slug":"the-template-method-pattern-%e6%a8%a1%e6%9d%bf%e6%96%b9%e6%b3%95%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=2278","title":{"rendered":"The Template Method Pattern – \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f"},"content":{"rendered":"

\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u62bd\u8c61\u51fa\u7b97\u6cd5\u6267\u884c\u6d41\u7a0b\u8fdb\u884c\u5c01\u88c5\uff0c\u5f3a\u5236\u8c03\u7528\u6b64\u65b9\u6cd5\u7684\u8fd0\u884c\u65f6\u7c7b\u90fd\u6309\u7167\u6b64\u6d41\u7a0b\u6267\u884c<\/p>\n

\u6d41\u7a0b\u4e2d\u7684\u5177\u4f53\u6b65\u9aa4\u53ef\u7531\u5b50\u7c7b\u5b9e\u73b0\uff0c\u94a9\u5b50\u51fd\u6570\u8d4b\u4e88\u5b50\u7c7b\u51b3\u5b9a\u662f\u5426\u6267\u884c\u6b64\u6b65\u9aa4\u7684\u6743\u5229<\/p>\n

\u9ad8\u5c42\u8bbe\u8ba1\u6846\u67b6\u4e25\u683c\u6267\u884c\u6d41\u7a0b<\/h4>\n
\npublic abstract class AbstractBase {\n\n    public abstract void stepOne();\n\n    public abstract void stepTwo();\n\n    public abstract void stepThree();\n\n    public abstract boolean isStepThreeChosen();\n\n    private void stepMutual() {\n        System.out.println(\"execute StepMutual()\");\n    }\n\n    public final void execute() {               \/\/ \u6a21\u677f\u65b9\u6cd5\u89c4\u5b9a\u4e86\u5404\u6b65\u9aa4\u6267\u884c\u987a\u5e8f\uff0c\u5b50\u7c7b\u4e0d\u53ef\u8986\u5199\n        stepOne();                              \/\/ \u7531\u5b50\u7c7b\u5b9e\u73b0\u7684\u6b65\u9aa4\n        stepTwo();                              \/\/ \u7531\u5b50\u7c7b\u5b9e\u73b0\u7684\u6b65\u9aa4\n        if (isStepThreeChosen()) stepThree();   \/\/ \u7531\u5b50\u7c7b\u51b3\u5b9a\u662f\u5426\u6267\u884c\u6b64\u6b65\u9aa4\n        stepMutual();                           \/\/ \u5f3a\u5236\u5b50\u7c7b\u6267\u884c\u5176\u4e0d\u53ef\u89c1\u4e0d\u53ef\u66f4\u6539\u7684\u6b65\u9aa4\n    }\n}\n<\/pre>\n
\u5e95\u5c42\u8d1f\u8d23\u5177\u4f53\u6b65\u9aa4\u7684\u5b9e\u73b0<\/h4>\n
\nclass Sub extends AbstractBase {\n\n    @Override\n    public void stepOne() {\n        System.out.println(\"execute Sub's StepOne()\");\n    }\n\n    @Override\n    public void stepTwo() {\n        System.out.println(\"execute Sub's StepTwo()\");\n    }\n\n    @Override\n    public void stepThree() {\n        System.out.println(\"execute Sub's StepThree()\");\n    }\n\n    @Override\n    public boolean isStepThreeChosen() {\n        return false;\n    }\n}\n<\/pre>\n
\u6d4b\u8bd5<\/h4>\n
\nclass TestDemo {\n    public static void main(String[] args) {\n        new Sub().execute();\n    }\n}\n<\/pre>\n
execute Sub's StepOne()\nexecute Sub's StepTwo()\nexecute StepMutual()\n<\/code><\/pre>\n
\u5e94\u7528<\/h4>\n
\u5c01\u88c5\u516c\u7528\u7ec4\u4ef6\u7684\u521d\u59cb\u5316\u6d41\u7a0b\uff1a\u7531\u5404\u5b9e\u73b0\u7c7b\u6309\u9700\u9009\u62e9\u81ea\u8eab\u90e8\u4ef6
\n\u5c01\u88c5\u516c\u7528\u7b97\u6cd5\uff1a\u5982JDK1.8\u7684Arrays.sort(T[] a, Comparator<? super T> c)\uff0csort\u51fd\u6570\u63d0\u4f9b\u6392\u5e8f\u6a21\u677f\uff0cComparator\u63a5\u53e3\u5b9e\u73b0\u65b9\u6cd5\u63d0\u4f9b\u6392\u5e8f\u7b97\u6cd5\u4e2d\u7684\u6bd4\u8f83\u7ec6\u8282<\/p>\n
\u53c2\u8003\u8d44\u6599<\/h4>\n
Freeman E, Robson E. Head First Design Patterns: Building Extensible and Maintainable Object-Oriented Software[M]. Second Edition. O’Reilly, 2020.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u62bd\u8c61\u51fa\u7b97\u6cd5\u6267\u884c\u6d41\u7a0b\u8fdb\u884c\u5c01\u88c5\uff0c\u5f3a\u5236\u8c03\u7528\u6b64\u65b9\u6cd5\u7684\u8fd0\u884c\u65f6\u7c7b\u90fd\u6309\u7167\u6b64\u6d41\u7a0b\u6267\u884c \u6d41\u7a0b\u4e2d\u7684\u5177\u4f53\u6b65\u9aa4\u53ef\u7531\u5b50\u7c7b\u5b9e\u73b0 … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201cThe Template Method Pattern – \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\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\/2278"}],"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=2278"}],"version-history":[{"count":5,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/2278\/revisions"}],"predecessor-version":[{"id":2283,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/2278\/revisions\/2283"}],"wp:attachment":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2278"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}