{"id":676,"date":"2024-03-01T23:51:45","date_gmt":"2023-07-25T00:05:02","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e7%bb%84%e5%90%88%e4%b8%8e%e7%bb%a7%e6%89%bf\/"},"modified":"2025-08-03T02:38:14","modified_gmt":"2025-08-02T18:38:14","slug":"%e7%bb%84%e5%90%88%e4%b8%8e%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%bb%84%e5%90%88%e4%b8%8e%e7%bb%a7%e6%89%bf\/","title":{"rendered":"\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u7ec4\u5408\u4e0e\u7ee7\u627f\uff1a\u9009\u62e9\u4e0e\u5e94\u7528\u6307\u5357"},"content":{"rendered":"<p>\u7ec4\u5408\u4e0e\u7ee7\u627f\u662f\u5e38\u89c1\u7684\u9762\u8bd5\u95ee\u9898\u4e4b\u4e00\u3002\u4f60\u4e00\u5b9a\u4e5f\u542c\u8bf4\u8fc7\u5728\u8bbe\u8ba1\u4e2d\u8981\u7528\u7ec4\u5408\u800c\u4e0d\u662f\u7ee7\u627f\u3002<\/p>\n<h2>\u7ec4\u5408\u548c\u7ee7\u627f<\/h2>\n<p>\u7ec4\u5408\u548c\u7ee7\u627f\u90fd\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6982\u5ff5\u3002\u5b83\u4eec\u4e0e\u4efb\u4f55\u7279\u5b9a\u7684\u7f16\u7a0b\u8bed\u8a00\uff08\u5982Java\uff09\u65e0\u5173\u3002\u5728\u6211\u4eec\u5bf9\u6bd4\u7ec4\u5408\u4e0e\u7ee7\u627f\u7684\u7f16\u7a0b\u5b9e\u73b0\u4e4b\u524d\uff0c\u8ba9\u6211\u4eec\u5bf9\u5b83\u4eec\u8fdb\u884c\u7b80\u8981\u5b9a\u4e49\u3002<\/p>\n<h2>\u7ec4\u5408<\/h2>\n<p>\u7ec4\u5408\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u8bbe\u8ba1\u6280\u672f\uff0c\u7528\u4e8e\u5b9e\u73b0\u5bf9\u8c61\u4e4b\u95f4\u7684&#8221;\u62e5\u6709\u5173\u7cfb&#8221;\u3002\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5176\u4ed6\u5bf9\u8c61\u7684\u5b9e\u4f8b\u53d8\u91cf\u6765\u5b9e\u73b0\u7ec4\u5408\u3002\u4f8b\u5982\uff0c\u5728Java\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\uff0c\u4e00\u4e2a\u62e5\u6709\u804c\u4f4d\u7684\u4eba\u53ef\u4ee5\u88ab\u5b9e\u73b0\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.composition;\r\n\r\npublic class Job {\r\n\/\/ \u53d8\u91cf\u3001\u65b9\u6cd5\u7b49\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>package com.Olivia.composition;\r\n\r\npublic class Person {\r\n\r\n    \/\/ \u7ec4\u5408\u5173\u7cfb - \u62e5\u6709\u5173\u7cfb\r\n    private Job job;\r\n\r\n    \/\/ \u53d8\u91cf\u3001\u65b9\u6cd5\u3001\u6784\u9020\u51fd\u6570\u7b49\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u5185\u5bb9\r\n}\r\n<\/code><\/pre>\n<h2>\u7ee7\u627f<\/h2>\n<p>\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u5b9e\u73b0\u5bf9\u8c61\u4e4b\u95f4\u7684&#8221;is-a&#8221;\u5173\u7cfb\u7684\u8bbe\u8ba1\u6280\u672f\u3002\u5728Java\u4e2d\uff0c\u7ee7\u627f\u662f\u901a\u8fc7extends\u5173\u952e\u5b57\u6765\u5b9e\u73b0\u7684\u3002\u4f8b\u5982\uff0c\u5728Java\u7f16\u7a0b\u4e2d\uff0cCat\u662fAnimal\u7684\u5173\u7cfb\u53ef\u4ee5\u5982\u4e0b\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.inheritance;\r\n \r\npublic class Animal {\r\n\/\/ \u53d8\u91cf\u3001\u65b9\u6cd5\u7b49\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>package com.Olivia.inheritance;\r\n \r\npublic class Cat extends Animal{\r\n}\r\n<\/code><\/pre>\n<h2>\u5728\u7f16\u7a0b\u4e2d\uff0c\u7ec4\u5408\u4f18\u4e8e\u7ee7\u627f\u3002<\/h2>\n<p>\u65e0\u8bba\u662f\u7ec4\u5408\u8fd8\u662f\u7ee7\u627f\uff0c\u90fd\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u7684\u65b9\u5f0f\u4fc3\u8fdb\u4ee3\u7801\u7684\u91cd\u7528\u3002\u90a3\u4e48\u8be5\u9009\u62e9\u54ea\u79cd\u5462\uff1f\u5982\u4f55\u6bd4\u8f83\u7ec4\u5408\u548c\u7ee7\u627f\u5173\u7cfb\uff1f\u4f60\u80af\u5b9a\u542c\u8bf4\u8fc7\u5728\u7f16\u7a0b\u4e2d\uff0c\u5e94\u8be5\u4f18\u5148\u9009\u62e9\u7ec4\u5408\u800c\u975e\u7ee7\u627f\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u4e00\u4e9b\u80fd\u5e2e\u52a9\u4f60\u9009\u62e9\u7ec4\u5408\u548c\u7ee7\u627f\u5173\u7cfb\u7684\u7406\u7531\u3002<\/p>\n<ol>\n<li>\n<p>\u7ee7\u627f\u5177\u6709\u7d27\u5bc6\u8026\u5408\uff0c\u800c\u7ec4\u5408\u5177\u6709\u677e\u6563\u8026\u5408\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u5177\u6709\u7ee7\u627f\u5173\u7cfb\u7684\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.java.examples;\r\n\r\npublic class ClassA {\r\n    public void foo(){\r\n    }\r\n}\r\n\r\nclass ClassB extends ClassA {\r\n    public void bar(){\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u7b80\u5316\uff0c\u6211\u4eec\u5c06\u8d85\u7c7b\u548c\u5b50\u7c7b\u90fd\u653e\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u4f46\u5b83\u4eec\u901a\u5e38\u4f1a\u5728\u4e0d\u540c\u7684\u4ee3\u7801\u5e93\u4e2d\u3002\u53ef\u80fd\u4f1a\u6709\u8bb8\u591a\u7c7b\u6269\u5c55\u8d85\u7c7bClassA\u3002\u8fd9\u79cd\u60c5\u51b5\u7684\u4e00\u4e2a\u975e\u5e38\u5e38\u89c1\u7684\u4f8b\u5b50\u662f\u6269\u5c55\u5f02\u5e38\u7c7b\u3002\u73b0\u5728\u5047\u8bbeClassA\u7684\u5b9e\u73b0\u53d1\u751f\u4e86\u4ee5\u4e0b\u53d8\u5316\uff0c\u6dfb\u52a0\u4e86\u4e00\u4e2a\u65b0\u65b9\u6cd5bar()\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.java.examples;\r\n\r\npublic class ClassA {\r\n    public void foo(){\r\n    }\r\n\r\n    public int bar(){\r\n        return 0;\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e00\u65e6\u5f00\u59cb\u4f7f\u7528\u65b0\u7684ClassA\u5b9e\u73b0\uff0c\u4f60\u5c06\u5728ClassB\u4e2d\u5f97\u5230\u7f16\u8bd1\u65f6\u9519\u8bef\uff0c\u51fa\u9519\u4fe1\u606f\u4e3a&#8221;\u8fd4\u56de\u7c7b\u578b\u4e0eClassA.bar()\u4e0d\u517c\u5bb9&#8221;\u3002\u89e3\u51b3\u65b9\u6848\u662f\u66f4\u6539\u8d85\u7c7b\u6216\u5b50\u7c7b\u7684bar()\u65b9\u6cd5\uff0c\u4f7f\u5176\u517c\u5bb9\u3002\u5982\u679c\u4f7f\u7528\u7ec4\u5408\u800c\u4e0d\u662f\u7ee7\u627f\uff0c\u4f60\u5c06\u6c38\u8fdc\u4e0d\u4f1a\u9047\u5230\u8fd9\u4e2a\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u7ec4\u5408\u7684ClassB\u5b9e\u73b0\u7684\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code>class ClassB {\r\n    ClassA classA = new ClassA();\r\n\r\n    public void bar(){\r\n        classA.foo();\r\n        classA.bar();\r\n    }\r\n}\r\n<\/code><\/pre>\n<\/li>\n<li>\n<p>\u7ee7\u627f\u4e2d\u6ca1\u6709\u8bbf\u95ee\u63a7\u5236\uff0c\u800c\u7ec4\u5408\u4e2d\u53ef\u4ee5\u9650\u5236\u8bbf\u95ee\u3002\u6211\u4eec\u5411\u5177\u6709\u8bbf\u95ee\u5b50\u7c7b\u6743\u9650\u7684\u5176\u4ed6\u7c7b\u516c\u5f00\u6240\u6709\u8d85\u7c7b\u65b9\u6cd5\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5f15\u5165\u65b0\u65b9\u6cd5\u6216\u8d85\u7c7b\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u5219\u5b50\u7c7b\u53d8\u5f97\u8106\u5f31\u3002\u7531\u4e8e\u5728\u7ec4\u5408\u4e2d\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u54ea\u4e9b\u65b9\u6cd5\uff0c\u56e0\u6b64\u6bd4\u7ee7\u627f\u66f4\u5b89\u5168\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u5728ClassB\u4e2d\u4e3a\u5176\u4ed6\u7c7b\u63d0\u4f9bClassA foo()\u65b9\u6cd5\u7684\u516c\u5f00\u3002<\/p>\n<pre class=\"post-pre\"><code>class ClassB {\r\n    ClassA classA = new ClassA();\r\n\r\n    public void foo(){\r\n        classA.foo();\r\n    }\r\n\r\n    public void bar(){\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u7ec4\u5408\u4f18\u4e8e\u7ee7\u627f\u7684\u4e00\u4e2a\u4e3b\u8981\u4f18\u52bf\u4e4b\u4e00\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ec4\u5408\u63d0\u4f9b\u4e86\u5728\u5177\u6709\u591a\u4e2a\u5b50\u7c7b\u7684\u60c5\u51b5\u4e0b\u8c03\u7528\u65b9\u6cd5\u7684\u7075\u6d3b\u6027\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u7ee7\u627f\u573a\u666f\u3002<\/p>\n<pre class=\"post-pre\"><code>abstract class Abs {\r\n    abstract void foo();\r\n}\r\n\r\npublic class ClassA extends Abs {\r\n    public void foo(){\r\n    }\r\n}\r\n\r\nclass ClassB extends Abs {\r\n    public void foo(){\r\n    }\r\n}\r\n\r\nclass Test {\r\n    ClassA a = new ClassA();\r\n    ClassB b = new ClassB();\r\n\r\n    public void test(){\r\n        a.foo();\r\n        b.foo();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u90a3\u4e48\u5982\u679c\u6709\u66f4\u591a\u7684\u5b50\u7c7b\uff0c\u901a\u8fc7\u4e3a\u6bcf\u4e2a\u5b50\u7c7b\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u7ec4\u5408\u4f1a\u4f7f\u6211\u4eec\u7684\u4ee3\u7801\u53d8\u5f97\u6df7\u4e71\u5417\uff1f\u4e0d\u4f1a\uff0c\u6211\u4eec\u53ef\u4ee5\u50cf\u4ee5\u4e0b\u8fd9\u6837\u91cd\u65b0\u7f16\u5199Test\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>class Test {\r\n    Abs obj = null;\r\n\r\n    Test(Abs o){\r\n        this.obj = o;\r\n    }\r\n\r\n    public void foo(){\r\n        this.obj.foo();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u5c06\u4f7f\u4f60\u6709\u673a\u4f1a\u6839\u636e\u6784\u9020\u51fd\u6570\u4e2d\u4f7f\u7528\u7684\u5bf9\u8c61\u9009\u62e9\u4efb\u4f55\u5b50\u7c7b\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ec4\u5408\u76f8\u5bf9\u4e8e\u7ee7\u627f\u7684\u53e6\u4e00\u4e2a\u597d\u5904\u662f\u6d4b\u8bd5\u8303\u56f4\u3002\u5728\u7ec4\u5408\u4e2d\u8fdb\u884c\u5355\u5143\u6d4b\u8bd5\u66f4\u5bb9\u6613\uff0c\u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u6211\u4eec\u4ece\u53e6\u4e00\u4e2a\u7c7b\u4f7f\u7528\u4e86\u54ea\u4e9b\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u4e3a\u6d4b\u8bd5\u76ee\u7684\u6a21\u62df\u5b83\uff0c\u800c\u5728\u7ee7\u627f\u4e2d\uff0c\u6211\u4eec\u4e25\u91cd\u4f9d\u8d56\u4e8e\u8d85\u7c7b\uff0c\u4e0d\u77e5\u9053\u4f1a\u4f7f\u7528\u8d85\u7c7b\u7684\u54ea\u4e9b\u65b9\u6cd5\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u6d4b\u8bd5\u8d85\u7c7b\u7684\u6240\u6709\u65b9\u6cd5\u3002\u8fd9\u662f\u989d\u5916\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u9700\u8981\u4e0d\u5fc5\u8981\u5730\u8fdb\u884c\uff0c\u8fd9\u662f\u7531\u4e8e\u7ee7\u627f\u800c\u5bfc\u81f4\u7684\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u8fd9\u5c31\u662f\u6709\u5173\u4e8e\u7ec4\u5408\u4e0e\u7ee7\u627f\u7684\u5168\u90e8\u5185\u5bb9\u3002\u4f60\u5df2\u7ecf\u6709\u8db3\u591f\u7684\u7406\u7531\u9009\u62e9\u7ec4\u5408\u800c\u4e0d\u662f\u7ee7\u627f\u3002\u53ea\u6709\u5728\u786e\u5b9a\u8d85\u7c7b\u4e0d\u4f1a\u88ab\u66f4\u6539\u7684\u60c5\u51b5\u4e0b\u624d\u4f7f\u7528\u7ee7\u627f\uff0c\u5426\u5219\u9009\u62e9\u7ec4\u5408\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ec4\u5408\u4e0e\u7ee7\u627f\u662f\u5e38\u89c1\u7684\u9762\u8bd5\u95ee\u9898\u4e4b\u4e00\u3002\u4f60\u4e00\u5b9a\u4e5f\u542c\u8bf4\u8fc7\u5728\u8bbe\u8ba1\u4e2d\u8981\u7528\u7ec4\u5408\u800c\u4e0d\u662f\u7ee7\u627f\u3002 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