{"id":897,"date":"2023-02-16T18:27:19","date_gmt":"2023-02-20T05:57:50","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e5%86%85%e9%83%a8%e7%b1%bb\/"},"modified":"2025-08-03T16:14:23","modified_gmt":"2025-08-03T08:14:23","slug":"java%e5%86%85%e9%83%a8%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%86%85%e9%83%a8%e7%b1%bb\/","title":{"rendered":"Java\u5185\u90e8\u7c7b\u8be6\u89e3\uff1a\u7c7b\u578b\u3001\u7528\u6cd5\u4e0e\u5b9e\u4f8b"},"content":{"rendered":"<h1>Java\u5185\u90e8\u7c7b\u8be6\u89e3<\/h1>\n<p>Java\u5185\u90e8\u7c7b\u662f\u5728\u53e6\u4e00\u4e2a\u7c7b\u7684\u4e3b\u4f53\u5185\u5b9a\u4e49\u7684\u7c7b\u3002Java\u5185\u90e8\u7c7b\u53ef\u4ee5\u58f0\u660e\u4e3aprivate\u3001public\u3001protected\u6216\u9ed8\u8ba4\u8bbf\u95ee\u7ea7\u522b\uff0c\u800c\u5916\u90e8\u7c7b\u53ea\u80fd\u6709public\u6216\u9ed8\u8ba4\u8bbf\u95ee\u7ea7\u522b\u3002Java\u5d4c\u5957\u7c7b\u5206\u4e3a\u4e24\u79cd\u4e3b\u8981\u7c7b\u578b\u3002<\/p>\n<h2>1. \u9759\u6001\u5d4c\u5957\u7c7b<\/h2>\n<p>\u5982\u679c\u5d4c\u5957\u7c7b\u662f\u9759\u6001\u7684\uff0c\u5219\u79f0\u4e3a\u9759\u6001\u5d4c\u5957\u7c7b\u3002\u9759\u6001\u5d4c\u5957\u7c7b\u53ea\u80fd\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u9759\u6001\u6210\u5458\u3002\u9759\u6001\u5d4c\u5957\u7c7b\u4e0e\u5176\u4ed6\u9876\u7ea7\u7c7b\u76f8\u540c\uff0c\u53ea\u662f\u4e3a\u4e86\u65b9\u4fbf\u5c01\u88c5\u800c\u5d4c\u5957\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u521b\u5efa\u9759\u6001\u7c7b\u5bf9\u8c61\uff1a<\/p>\n<pre><code>OuterClass.StaticNestedClass nestedObject = new OuterClass.StaticNestedClass();<\/code><\/pre>\n<h2>2. \u5185\u90e8\u7c7b<\/h2>\n<p>\u4efb\u4f55\u975e\u9759\u6001\u7684\u5d4c\u5957\u7c7b\u5728Java\u4e2d\u88ab\u79f0\u4e3a\u5185\u90e8\u7c7b\u3002Java\u5185\u90e8\u7c7b\u4e0e\u7c7b\u7684\u5b9e\u4f8b\u76f8\u5173\u8054\uff0c\u5b83\u4eec\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u6240\u6709\u53d8\u91cf\u548c\u65b9\u6cd5\u3002\u7531\u4e8e\u5185\u90e8\u7c7b\u4e0e\u5b9e\u4f8b\u76f8\u5173\u8054\uff0c\u56e0\u6b64\u5b83\u4eec\u4e0d\u80fd\u6709\u4efb\u4f55\u9759\u6001\u53d8\u91cf\u3002Java\u5185\u90e8\u7c7b\u7684\u5bf9\u8c61\u662f\u5916\u90e8\u7c7b\u5bf9\u8c61\u7684\u4e00\u90e8\u5206\uff0c\u8981\u521b\u5efa\u5185\u90e8\u7c7b\u7684\u5b9e\u4f8b\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u521b\u5efa\u5916\u90e8\u7c7b\u7684\u5b9e\u4f8b\u3002\u53ef\u4ee5\u50cf\u8fd9\u6837\u5b9e\u4f8b\u5316Java\u5185\u90e8\u7c7b\uff1a<\/p>\n<pre><code>OuterClass outerObject = new OuterClass();\r\nOuterClass.InnerClass innerObject = outerObject.new InnerClass();<\/code><\/pre>\n<p>\u6709\u4e24\u79cd\u7279\u6b8a\u7c7b\u578b\u7684Java\u5185\u90e8\u7c7b\uff1a<\/p>\n<h3>2.1 \u5c40\u90e8\u5185\u90e8\u7c7b<\/h3>\n<p>\u5982\u679c\u4e00\u4e2a\u7c7b\u5728\u65b9\u6cd5\u4f53\u4e2d\u5b9a\u4e49\uff0c\u5b83\u88ab\u79f0\u4e3a\u5c40\u90e8\u5185\u90e8\u7c7b\u3002\u7531\u4e8e\u5c40\u90e8\u5185\u90e8\u7c7b\u4e0e\u5bf9\u8c61\u65e0\u5173\uff0c\u6211\u4eec\u4e0d\u80fd\u5728\u5176\u4e0a\u4f7f\u7528private\u3001public\u6216protected\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u552f\u4e00\u5141\u8bb8\u7684\u4fee\u9970\u7b26\u662fabstract\u6216final\u3002\u5c40\u90e8\u5185\u90e8\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u5c01\u95ed\u7c7b\u7684\u6240\u6709\u6210\u5458\u548c\u5728\u5176\u5b9a\u4e49\u8303\u56f4\u5185\u7684\u5c40\u90e8final\u53d8\u91cf\u3002\u6b64\u5916\uff0c\u5b83\u8fd8\u53ef\u4ee5\u8bbf\u95ee\u65b9\u6cd5\u4e2d\u7684\u975efinal\u5c40\u90e8\u53d8\u91cf\uff0c\u4f46\u4e0d\u80fd\u4fee\u6539\u5b83\u4eec\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5c1d\u8bd5\u6253\u5370\u975efinal\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u5c06\u88ab\u5141\u8bb8\uff0c\u4f46\u5982\u679c\u5c1d\u8bd5\u5728\u65b9\u6cd5\u5c40\u90e8\u5185\u90e8\u7c7b\u4e2d\u66f4\u6539\u5176\u503c\uff0c\u5c06\u4f1a\u5f97\u5230\u7f16\u8bd1\u65f6\u9519\u8bef\u3002\u5c40\u90e8\u5185\u90e8\u7c7b\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<pre><code>package com.Olivia.innerclasses;\r\n\r\npublic class MainClass {\r\n\r\n    private String s_main_class;\r\n\r\n    public void print() {\r\n        String s_print_method = \"\";\r\n        \/\/ \u65b9\u6cd5\u5185\u90e8\u7684\u5c40\u90e8\u5185\u90e8\u7c7b\r\n        class Logger {\r\n            \/\/ \u53ef\u4ee5\u8bbf\u95ee\u5c01\u95ed\u7c7b\u7684\u53d8\u91cf\r\n            String name = s_main_class;\r\n            \/\/ \u53ef\u4ee5\u8bbf\u95ee\u975efinal\u65b9\u6cd5\u53d8\u91cf\r\n            String name1 = s_print_method;\r\n\r\n            public void foo() {\r\n                String name1 = s_print_method;\r\n                \/\/ \u4ee5\u4e0b\u4ee3\u7801\u5c06\u629b\u51fa\u7f16\u8bd1\u65f6\u9519\u8bef\uff1a\r\n                \/\/ \u5728\u5c01\u95ed\u8303\u56f4\u4e2d\u5b9a\u4e49\u7684\u5c40\u90e8\u53d8\u91cfs_print_method\u5fc5\u987b\u662ffinal\u6216\u6709\u6548final\u7684\r\n                \/\/ s_print_method = \":\";\r\n            }\r\n        }\r\n        \/\/ \u5728\u65b9\u6cd5\u4e2d\u5b9e\u4f8b\u5316\u5c40\u90e8\u5185\u90e8\u7c7b\u4ee5\u4f7f\u7528\r\n        Logger logger = new Logger();\r\n    }\r\n}<\/code><\/pre>\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u4efb\u4f55\u4ee3\u7801\u5757\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u5c40\u90e8\u5185\u90e8\u7c7b\uff0c\u4f8b\u5982\u9759\u6001\u4ee3\u7801\u5757\u3001if-else\u4ee3\u7801\u5757\u7b49\u3002\u7136\u800c\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7c7b\u7684\u8303\u56f4\u5c06\u975e\u5e38\u6709\u9650\u3002<\/p>\n<pre><code>public class MainClass {\r\n\r\n    static {\r\n        class Foo {\r\n        \r\n        }\r\n        Foo f = new Foo();\r\n    }\r\n\r\n    public void bar() {\r\n        if(1 < 2) {\r\n            class Test {\r\n            \r\n            }\r\n            Test t1 = new Test();\r\n        }\r\n        \/\/ \u4ee5\u4e0b\u4ee3\u7801\u5c06\u629b\u51fa\u9519\u8bef\uff0c\u56e0\u4e3a\u7c7b\u7684\u8303\u56f4\u4e0d\u540c\r\n        \/\/ Test t = new Test();\r\n        \/\/ Foo f = new Foo();\r\n    }\r\n}<\/code><\/pre>\n<h3>2.2 \u533f\u540d\u5185\u90e8\u7c7b<\/h3>\n<p>\u6ca1\u6709\u540d\u79f0\u7684\u5c40\u90e8\u5185\u90e8\u7c7b\u79f0\u4e3a\u533f\u540d\u5185\u90e8\u7c7b\u3002\u533f\u540d\u7c7b\u5728\u4e00\u6761\u8bed\u53e5\u4e2d\u5b9a\u4e49\u548c\u5b9e\u4f8b\u5316\u3002\u533f\u540d\u5185\u90e8\u7c7b\u603b\u662f\u7ee7\u627f\u4e00\u4e2a\u7c7b\u6216\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3\u3002\u7531\u4e8e\u533f\u540d\u7c7b\u6ca1\u6709\u540d\u79f0\uff0c\u56e0\u6b64\u65e0\u6cd5\u4e3a\u533f\u540d\u7c7b\u5b9a\u4e49\u6784\u9020\u51fd\u6570\u3002\u533f\u540d\u5185\u90e8\u7c7b\u53ea\u80fd\u5728\u5b9a\u4e49\u5b83\u7684\u5730\u65b9\u624d\u80fd\u8bbf\u95ee\u3002\u5982\u4f55\u521b\u5efa\u533f\u540d\u5185\u90e8\u7c7b\u6709\u70b9\u96be\u4ee5\u5b9a\u4e49\uff0c\u6211\u4eec\u5c06\u5728\u4e0b\u9762\u7684\u6d4b\u8bd5\u7a0b\u5e8f\u4e2d\u770b\u5230\u5b83\u7684\u5b9e\u65f6\u7528\u6cd5\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5c55\u793a\u5982\u4f55\u5b9a\u4e49Java\u5185\u90e8\u7c7b\u3001\u9759\u6001\u5d4c\u5957\u7c7b\u3001\u5c40\u90e8\u5185\u90e8\u7c7b\u548c\u533f\u540d\u5185\u90e8\u7c7b\u7684Java\u7c7b\u6587\u4ef6 - OuterClass.java\uff1a<\/p>\n<pre><code>package com.Olivia.nested;\r\n\r\nimport java.io.File;\r\nimport java.io.FilenameFilter;\r\n\r\npublic class OuterClass {\r\n    \r\n    private static String name = \"OuterClass\";\r\n    private int i;\r\n    protected int j;\r\n    int k;\r\n    public int l;\r\n\r\n    \/\/ OuterClass\u6784\u9020\u51fd\u6570\r\n    public OuterClass(int i, int j, int k, int l) {\r\n        this.i = i;\r\n        this.j = j;\r\n        this.k = k;\r\n        this.l = l;\r\n    }\r\n\r\n    public int getI() {\r\n        return this.i;\r\n    }\r\n\r\n    \/\/ \u9759\u6001\u5d4c\u5957\u7c7b\uff0c\u53ef\u4ee5\u8bbf\u95eeOuterClass\u7684\u9759\u6001\u53d8\u91cf\/\u65b9\u6cd5\r\n    static class StaticNestedClass {\r\n        private int a;\r\n        protected int b;\r\n        int c;\r\n        public int d;\r\n\r\n        public int getA() {\r\n            return this.a;\r\n        }\r\n\r\n        public String getName() {\r\n            return name;\r\n        }\r\n    }\r\n\r\n    \/\/ \u5185\u90e8\u7c7b\uff0c\u975e\u9759\u6001\uff0c\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u6240\u6709\u53d8\u91cf\/\u65b9\u6cd5\r\n    class InnerClass {\r\n        private int w;\r\n        protected int x;\r\n        int y;\r\n        public int z;\r\n\r\n        public int getW() {\r\n            return this.w;\r\n        }\r\n\r\n        public void setValues() {\r\n            this.w = i;\r\n            this.x = j;\r\n            this.y = k;\r\n            this.z = l;\r\n        }\r\n\r\n        @Override\r\n        public String toString() {\r\n            return \"w=\" + w + \":x=\" + x + \":y=\" + y + \":z=\" + z;\r\n        }\r\n\r\n        public String getName() {\r\n            return name;\r\n        }\r\n    }\r\n\r\n    \/\/ \u5c40\u90e8\u5185\u90e8\u7c7b\r\n    public void print(String initial) {\r\n        \/\/ \u65b9\u6cd5\u5185\u7684\u5c40\u90e8\u5185\u90e8\u7c7b\r\n        class Logger {\r\n            String name;\r\n\r\n            public Logger(String name) {\r\n                this.name = name;\r\n            }\r\n\r\n            public void log(String str) {\r\n                System.out.println(this.name + \": \" + str);\r\n            }\r\n        }\r\n\r\n        Logger logger = new Logger(initial);\r\n        logger.log(name);\r\n        logger.log(\"\" + this.i);\r\n        logger.log(\"\" + this.j);\r\n        logger.log(\"\" + this.k);\r\n        logger.log(\"\" + this.l);\r\n    }\r\n\r\n    \/\/ \u533f\u540d\u5185\u90e8\u7c7b\r\n    public String[] getFilesInDir(String dir, final String ext) {\r\n        File file = new File(dir);\r\n        \/\/ \u5b9e\u73b0FilenameFilter\u63a5\u53e3\u7684\u533f\u540d\u5185\u90e8\u7c7b\r\n        String[] filesList = file.list(new FilenameFilter() {\r\n\r\n            @Override\r\n            public boolean accept(File dir, String name) {\r\n                return name.endsWith(ext);\r\n            }\r\n\r\n        });\r\n        return filesList;\r\n    }\r\n}<\/code><\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u6d4b\u8bd5\u7a0b\u5e8f\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5728Java\u4e2d\u5b9e\u4f8b\u5316\u548c\u4f7f\u7528\u5185\u90e8\u7c7b\u3002InnerClassTest.java\uff1a<\/p>\n<pre><code>package com.Olivia.nested;\r\n\r\nimport java.util.Arrays;\r\n\/\/ \u5d4c\u5957\u7c7b\u53ef\u4ee5\u5728\u5bfc\u5165\u4e2d\u4f7f\u7528\uff0c\u4ee5\u4fbf\u4e8e\u5b9e\u4f8b\u5316\r\nimport com.Olivia.nested.OuterClass.InnerClass;\r\nimport com.Olivia.nested.OuterClass.StaticNestedClass;\r\n\r\npublic class InnerClassTest {\r\n\r\n    public static void main(String[] args) {\r\n        OuterClass outer = new OuterClass(1,2,3,4);\r\n        \r\n        \/\/ \u9759\u6001\u5d4c\u5957\u7c7b\u793a\u4f8b\r\n        StaticNestedClass staticNestedClass = new StaticNestedClass();\r\n        StaticNestedClass staticNestedClass1 = new StaticNestedClass();\r\n        \r\n        System.out.println(staticNestedClass.getName());\r\n        staticNestedClass.d=10;\r\n        System.out.println(staticNestedClass.d);\r\n        System.out.println(staticNestedClass1.d);\r\n        \r\n        \/\/ \u5185\u90e8\u7c7b\u793a\u4f8b\r\n        InnerClass innerClass = outer.new InnerClass();\r\n        System.out.println(innerClass.getName());\r\n        System.out.println(innerClass);\r\n        innerClass.setValues();\r\n        System.out.println(innerClass);\r\n        \r\n        \/\/ \u4f7f\u7528\u5c40\u90e8\u5185\u90e8\u7c7b\u8c03\u7528\u65b9\u6cd5\r\n        outer.print(\"Outer\");\r\n        \r\n        \/\/ \u4f7f\u7528\u533f\u540d\u5185\u90e8\u7c7b\u8c03\u7528\u65b9\u6cd5\r\n        System.out.println(Arrays.toString(outer.getFilesInDir(\"src\/com\/scdev\/nested\", \".java\")));\r\n        \r\n        System.out.println(Arrays.toString(outer.getFilesInDir(\"bin\/com\/scdev\/nested\", \".class\")));\r\n    }\r\n}<\/code><\/pre>\n<p>\u8fd9\u662f\u4e0a\u8ff0Java\u5185\u90e8\u7c7b\u793a\u4f8b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre><code>OuterClass\r\n10\r\n0\r\nOuterClass\r\nw=0:x=0:y=0:z=0\r\nw=1:x=2:y=3:z=4\r\nOuter: OuterClass\r\nOuter: 1\r\nOuter: 2\r\nOuter: 3\r\nOuter: 4\r\n[NestedClassTest.java, OuterClass.java]\r\n[NestedClassTest.class, OuterClass$1.class, OuterClass$1Logger.class, OuterClass$InnerClass.class, OuterClass$StaticNestedClass.class, OuterClass.class]<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5f53\u7f16\u8bd1OuterClass\u65f6\uff0c\u5185\u90e8\u7c7b\u3001\u5c40\u90e8\u5185\u90e8\u7c7b\u548c\u9759\u6001\u5d4c\u5957\u7c7b\u4f1a\u5206\u522b\u751f\u6210\u72ec\u7acb\u7684\u7c7b\u6587\u4ef6\u3002<\/p>\n<h3>Java\u5185\u90e8\u7c7b\u7684\u597d\u5904<\/h3>\n<ul>\n<li>\u5982\u679c\u4e00\u4e2a\u7c7b\u53ea\u5bf9\u53e6\u4e00\u4e2a\u7c7b\u6709\u7528\uff0c\u628a\u5b83\u5d4c\u5957\u5728\u4e00\u8d77\u662f\u6709\u610f\u4e49\u7684\u3002\u8fd9\u6709\u52a9\u4e8e\u7c7b\u7684\u5c01\u88c5\u3002<\/li>\n<li>Java\u7684\u5185\u90e8\u7c7b\u5b9e\u73b0\u4e86\u5c01\u88c5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5185\u90e8\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u79c1\u6709\u6210\u5458\uff0c\u540c\u65f6\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06\u5185\u90e8\u7c7b\u5bf9\u5916\u90e8\u4e16\u754c\u9690\u85cf\u8d77\u6765\u3002<\/li>\n<li>\u5c06\u5c0f\u7684\u7c7b\u4fdd\u6301\u5728\u9876\u5c42\u7c7b\u5185\u90e8\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u9760\u8fd1\u4f7f\u7528\u5b83\u7684\u5730\u65b9\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u53ef\u8bfb\u548c\u53ef\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8eJava\u5185\u90e8\u7c7b\u7684\u5168\u90e8\u5185\u5bb9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u5185\u90e8\u7c7b\u8be6\u89e3 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