{"id":120,"date":"2015-04-01T16:38:50","date_gmt":"2015-04-01T08:38:50","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=120"},"modified":"2026-08-18T12:09:27","modified_gmt":"2026-08-18T04:09:27","slug":"java%e5%86%85%e9%83%a8%e7%b1%bb%e7%9a%84%e6%a6%82%e5%bf%b5%e5%92%8c%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=120","title":{"rendered":"Java\u5185\u90e8\u7c7b\u7684\u6982\u5ff5\u548c\u4f7f\u7528"},"content":{"rendered":"
\n

Java \u5141\u8bb8\u5728\u4e00\u4e2a\u7c7b\uff08\u6216\u65b9\u6cd5\u3001\u8bed\u53e5\u5757\uff09\u5185\u90e8\u518d\u5b9a\u4e49\u53e6\u4e00\u4e2a\u7c7b\uff0c\u79f0\u4e3a\u5185\u90e8\u7c7b<\/strong>\uff08Inner Class\uff09\uff0c\u6709\u65f6\u4e5f\u53eb\u5d4c\u5957\u7c7b\uff08Nested Class\uff09\u3002<\/p>\n

\u5185\u90e8\u7c7b\u548c\u5916\u5c42\u7c7b\u5b58\u5728\u903b\u8f91\u4e0a\u7684\u6240\u5c5e\u5173\u7cfb\uff0c\u4e00\u822c\u53ea\u7528\u5728\u5b9a\u4e49\u5b83\u7684\u7c7b\u6216\u8bed\u53e5\u5757\u91cc\uff0c\u5b9e\u73b0\u6ca1\u6709\u901a\u7528\u610f\u4e49\u7684\u529f\u80fd\u3002\u5916\u90e8\u5f15\u7528\u65f6\u5fc5\u987b\u7ed9\u51fa\u5b8c\u6574\u540d\u79f0\u3002<\/p>\n

<\/p>\n

\u4f7f\u7528\u5185\u90e8\u7c7b\u7684\u4e3b\u8981\u539f\u56e0\uff1a\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u6570\u636e\uff08\u5305\u62ec\u79c1\u6709\u7684\uff09\uff1b\u53ef\u4ee5\u5bf9\u540c\u4e00\u4e2a\u5305\u4e2d\u7684\u5176\u4ed6\u7c7b\u9690\u85cf\uff1b\u5199\u56de\u8c03\u65f6\u4e0d\u60f3\u5355\u72ec\u5f00\u4e00\u4e2a\u7c7b\uff0c\u533f\u540d\u5185\u90e8\u7c7b\u6bd4\u8f83\u65b9\u4fbf\uff1b\u4e5f\u80fd\u51cf\u5c11\u7c7b\u540d\u51b2\u7a81\u3002<\/p>\n\n\n\n\n\n\n\n\n
\u79cd\u7c7b<\/th>\n\u5b9a\u4e49\u4f4d\u7f6e<\/th>\n\u521b\u5efa\u65b9\u5f0f<\/th>\n<\/tr>\n<\/thead>\n
\u6210\u5458\u5185\u90e8\u7c7b\uff08\u975e static\uff09<\/td>\n\u7c7b\u4f53\u91cc\uff0c\u65b9\u6cd5\u5916<\/td>\n\u5fc5\u987b\u5148\u6709\u5916\u90e8\u5bf9\u8c61\uff0c\u518d outer.new Inner()<\/td>\n<\/tr>\n
\u9759\u6001\u5d4c\u5957\u7c7b<\/td>\n\u7c7b\u4f53\u91cc\uff0c\u5e26 static<\/td>\nnew Outer.Inner()\uff0c\u4e0d\u4f9d\u8d56\u5916\u90e8\u5b9e\u4f8b<\/td>\n<\/tr>\n
\u5c40\u90e8\u5185\u90e8\u7c7b<\/td>\n\u65b9\u6cd5\u6216\u4ee3\u7801\u5757\u91cc<\/td>\n\u53ea\u5728\u8be5\u5757\u5185\u53ef\u89c1<\/td>\n<\/tr>\n
\u533f\u540d\u5185\u90e8\u7c7b<\/td>\n\u8868\u8fbe\u5f0f\u91cc\u5f53\u573a\u5b9e\u73b0<\/td>\n\u5fc5\u987b\u7ee7\u627f\u7236\u7c7b\u6216\u5b9e\u73b0\u63a5\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5185\u90e8\u7c7b\u662f\u7f16\u8bd1\u5668\u73b0\u8c61\uff1a\u4f1a\u751f\u6210\u72ec\u7acb\u7684 Outer$Inner.class<\/code>\uff0c\u865a\u62df\u673a\u53ea\u770b\u5230\u666e\u901a\u7c7b\u3002\u5185\u90e8\u7c7b\u53ef\u4ee5\u7528 public\u3001protected\u3001private\uff0c\u5916\u90e8\u9876\u5c42\u7c7b\u53ea\u80fd public \u6216\u9ed8\u8ba4\u3002<\/p>\n

\u4e00\u3001\u6210\u5458\u5185\u90e8\u7c7b<\/h2>\n

\u5728\u5916\u90e8\u7c7b\u5185\u90e8\u76f4\u63a5\u5b9a\u4e49\uff08\u4e0d\u5728\u65b9\u6cd5\u6216\u4ee3\u7801\u5757\u91cc\uff09\u7684\u5c31\u662f\u6210\u5458\u5185\u90e8\u7c7b\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528\u5916\u90e8\u7c7b\u7684\u5168\u90e8\u6210\u5458\uff0c\u5305\u62ec private\u3002\u5916\u90e8\u7c7b\u8981\u8bbf\u95ee\u5185\u90e8\u7c7b\u6210\u5458\uff0c\u5f97\u901a\u8fc7\u5185\u90e8\u7c7b\u5bf9\u8c61\u3002<\/p>\n

public class Outer {\n    private int size;\n    public class Inner {\n        private int counter = 10;\n        public void doStuff() {\n            size++;\n        }\n    }\n    public static void main(String args[]) {\n        Outer outer = new Outer();\n        Inner inner = outer.new Inner();\n        inner.doStuff();\n        System.out.println(outer.size);\n        System.out.println(inner.counter);\n        \/\/ System.out.println(counter); \u7f16\u8bd1\u9519\u8bef\uff0c\u5916\u90e8\u7c7b\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5185\u90e8\u7c7b\u53d8\u91cf\n    }\n}<\/code><\/pre>\n
\u975e\u9759\u6001\u5185\u90e8\u7c7b\u5fc5\u987b\u5148\u6709\u5916\u90e8\u5bf9\u8c61\u624d\u80fd\u751f\u6210\uff0c\u56e0\u4e3a\u5b83\u8981\u8bbf\u95ee\u5916\u90e8\u5b9e\u4f8b\u6210\u5458\u3002\u975e\u9759\u6001\u5185\u90e8\u7c7b\u91cc\u4e0d\u80fd\u58f0\u660e static \u6210\u5458\uff08\u7f16\u8bd1\u671f\u5e38\u91cf\u9664\u5916\uff09\u3002\u540c\u4e00\u4e2a\u5916\u90e8\u7c7b\u91cc\u7684\u591a\u4e2a\u5185\u90e8\u7c7b\u53ef\u4ee5\u4e92\u76f8\u8c03\u7528\u3002<\/p>\n
\u6709 static \u5c31\u662f\u7c7b\u7ea7\uff0c\u53ef\u901a\u8fc7\u5916\u90e8\u7c7b\u540d\u8bbf\u95ee\uff1b\u6ca1\u6709\u5c31\u662f\u5bf9\u8c61\u7ea7\u3002\u975e\u9759\u6001\u5185\u90e8\u7c7b\u4f1a\u81ea\u52a8\u6301\u6709\u5916\u90e8\u5b9e\u4f8b\u5f15\u7528\uff0c\u7ea6\u5b9a\u5199\u6cd5\u662f Outer.this<\/code>\u3002<\/p>\n
1\uff09\u5916\u90e8\u521b\u5efa\u975e\u9759\u6001\u5185\u90e8\u7c7b<\/h3>\n
Outer outer = new Outer();\nOuter.Inner inner = outer.new Inner();\ninner.dostuff();<\/code><\/pre>\n
2\uff09\u9759\u6001\u5185\u90e8\u7c7b\u53ef\u76f4\u63a5 new<\/h3>\n
public class Demo {\n    public static void main(String[] args) {\n        Outer.Inner inner = new Outer.Inner();\n        inner.dostuff();\n    }\n}\nclass Outer {\n    private static int size;\n    static class Inner {\n        public void dostuff() {\n            size++;\n            System.out.println(\"size=\" + size);\n        }\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1asize=1\u3002\u9759\u6001\u5185\u90e8\u7c7b\u76f8\u5f53\u4e8e\u5916\u90e8\u7c7b\u7684 static \u6210\u5458\uff0c\u548c\u5916\u90e8\u5b9e\u4f8b\u6ca1\u6709\u4f9d\u8d56\uff0c\u56e0\u6b64\u53ea\u80fd\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u9759\u6001\u6210\u5458\u3002<\/p>\n
3\uff09\u540c\u540d\u6210\u5458\u600e\u4e48\u533a\u5206<\/h3>\n
public void dostuff(int size) {\n    size++;           \/\/ \u5c40\u90e8\u53d8\u91cf\n    this.size++;      \/\/ \u5185\u90e8\u7c7b\u7684 size\n    Outer.this.size++; \/\/ \u5916\u90e8\u7c7b\u7684 size\n}<\/code><\/pre>\n
\u4e8c\u3001\u5c40\u90e8\u5185\u90e8\u7c7b<\/h2>\n
\u5c40\u90e8\u5185\u90e8\u7c7b\u5b9a\u4e49\u5728\u4ee3\u7801\u5757\u4e2d\uff0c\u53ea\u5728\u8be5\u5757\u5185\u53ef\u89c1\u3002\u4e0d\u80fd\u662f static\uff0c\u4e5f\u4e0d\u80fd\u7528 public \/ private \/ protected\uff0c\u53ef\u4ee5\u7528 abstract\u3002Java 8 \u4e4b\u524d\u53ea\u80fd\u8bbf\u95ee\u5757\u91cc\u7684 final \u5c40\u90e8\u53d8\u91cf\uff1bJava 8 \u8d77\u6539\u4e3a\u201c\u5b9e\u9645\u4e0a\u7684 final\u201d\uff08\u8d4b\u503c\u4e00\u6b21\u5373\u53ef\uff0c\u4e0d\u5fc5\u5199\u51fa final\uff09\u3002<\/p>\n
public class Outer {\n    public static final int TOTAL_NUMBER = 5;\n    public int id = 123;\n    public void func() {\n        final int age = 15;\n        String str = \"http:\/\/www.warmtel.com\";\n        class Inner {\n            public void innerTest() {\n                System.out.println(TOTAL_NUMBER);\n                System.out.println(id);\n                \/\/ str \u82e5\u540e\u9762\u8fd8\u4f1a\u88ab\u8d4b\u503c\uff0c\u8fd9\u91cc\u5c31\u4e0d\u80fd\u7528\n                System.out.println(age);\n            }\n        }\n        new Inner().innerTest();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1a5\u3001123\u300115\u3002<\/p>\n
\u4e09\u3001\u533f\u540d\u5185\u90e8\u7c7b<\/h2>\n
\u533f\u540d\u5185\u90e8\u7c7b\u662f\u5c40\u90e8\u5185\u90e8\u7c7b\u7684\u7279\u6b8a\u5f62\u5f0f\uff1a\u6ca1\u6709\u540d\u5b57\u6307\u5411\u8fd9\u4e2a\u7c7b\uff0c\u5b9e\u73b0\u5199\u5728\u8868\u8fbe\u5f0f\u91cc\u3002\u5fc5\u987b\u7ee7\u627f\u4e00\u4e2a\u7236\u7c7b\u6216\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3\u3002\u5b50\u7c7b\u53ea\u7528\u4e00\u6b21\u65f6\uff0c\u4e0d\u5fc5\u5355\u72ec\u5199 Child\u3002<\/p>\n
abstract class Person {\n    public abstract void eat();\n}\npublic class Demo {\n    public static void main(String[] args) {\n        new Person() {\n            public void eat() {\n                System.out.println(\"eat something\");\n            }\n        }.eat();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1aeat something\u3002\u5185\u90e8\u7c7b\u8bed\u6cd5\u8f83\u7e41\uff0c\u5b9e\u9645\u5f00\u53d1\u91cc\u533f\u540d\u7c7b\uff08\u4ee5\u53ca\u540e\u6765\u7684 lambda\uff09\u7528\u5f97\u66f4\u591a\uff1b\u4e0d\u5fc5\u628a\u5b83\u5f53\u6210\u5165\u95e8\u91cd\u70b9\u6b7b\u78d5\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u5185\u90e8\u7c7b\u80fd\u6478\u5230\u5916\u90e8\u79c1\u6709\u6210\u5458\uff1b\u975e\u9759\u6001\u7684\u8981\u5148\u6709\u5916\u90e8\u5bf9\u8c61\uff0c\u9759\u6001\u7684\u53ef\u4ee5\u76f4\u63a5 new\uff0c\u5c40\u90e8\u548c\u533f\u540d\u53ea\u5728\u5f53\u573a\u7528\u4e00\u6b21\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
Java \u5141\u8bb8\u5728\u4e00\u4e2a\u7c7b\uff08\u6216\u65b9\u6cd5\u3001\u8bed\u53e5\u5757\uff09\u5185\u90e8\u518d\u5b9a\u4e49\u53e6\u4e00\u4e2a\u7c7b\uff0c\u79f0\u4e3a\u5185\u90e8\u7c7b\uff08Inner Class\uff09\uff0c\u6709\u65f6\u4e5f\u53eb\u5d4c\u5957 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[43,38],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/120"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=120"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/120\/revisions"}],"predecessor-version":[{"id":330,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/120\/revisions\/330"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}