{"id":519,"date":"2023-07-30T00:38:00","date_gmt":"2024-03-07T09:19:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84static%e5%85%b3%e9%94%ae%e5%ad%97\/"},"modified":"2025-08-02T15:23:20","modified_gmt":"2025-08-02T07:23:20","slug":"java%e4%b8%ad%e7%9a%84static%e5%85%b3%e9%94%ae%e5%ad%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84static%e5%85%b3%e9%94%ae%e5%ad%97\/","title":{"rendered":"Java static\u5173\u952e\u5b57\u5b8c\u5168\u6307\u5357\uff1a\u7528\u6cd5\u3001\u539f\u7406\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"<article>\n<h1>Java\u4e2d\u7684static\u5173\u952e\u5b57<\/h1>\n<p>Java\u4e2d\u7684static\u5173\u952e\u5b57\u5728Java\u7f16\u7a0b\u4e2d\u4f7f\u7528\u5f97\u975e\u5e38\u5e7f\u6cdb\u3002Java\u7684static\u5173\u952e\u5b57\u7528\u4e8e\u521b\u5efa\u7c7b\u7ea7\u522b\u7684\u53d8\u91cf\u548c\u65b9\u6cd5\u3002\u9759\u6001\u53d8\u91cf\u548c\u65b9\u6cd5\u5c5e\u4e8e\u7c7b\u672c\u8eab\uff0c\u800c\u4e0d\u662f\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<h2>Java\u4e2dstatic\u5173\u952e\u5b57\u7684\u7528\u9014<\/h2>\n<p>Java\u7684static\u5173\u952e\u5b57\u53ef\u4ee5\u5728\u4e94\u79cd\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002\u6211\u4eec\u5728\u8fd9\u91cc\u5c06\u8ba8\u8bba\u5176\u4e2d\u56db\u79cd\u60c5\u51b5\uff0c\u7b2c\u4e94\u79cd\u60c5\u51b5\u662f\u5728Java 8\u4e2d\u5f15\u5165\u7684\uff0c\u5e76\u5728Java 8\u63a5\u53e3\u66f4\u6539\u4e2d\u8fdb\u884c\u4e86\u8be6\u7ec6\u8ba8\u8bba\u3002<\/p>\n<h3>1. Java\u9759\u6001\u53d8\u91cf<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u5728\u7c7b\u7ea7\u522b\u53d8\u91cf\u4e2d\u4f7f\u7528static\u5173\u952e\u5b57\u3002\u9759\u6001\u53d8\u91cf\u662f\u4e00\u4e2a\u7c7b\u53d8\u91cf\uff0c\u4e0d\u5c5e\u4e8e\u7c7b\u7684\u4efb\u4f55\u5bf9\u8c61\u6216\u5b9e\u4f8b\u3002\u7531\u4e8e\u9759\u6001\u53d8\u91cf\u5728\u6240\u6709\u5bf9\u8c61\u5b9e\u4f8b\u4e4b\u95f4\u662f\u5171\u4eab\u7684\uff0c\u6240\u4ee5\u5b83\u4eec\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u901a\u5e38\uff0c\u9759\u6001\u53d8\u91cf\u4e0efinal\u5173\u952e\u5b57\u4e00\u8d77\u4f7f\u7528\uff0c\u7528\u4e8e\u5b9a\u4e49\u6240\u6709\u5bf9\u8c61\u90fd\u53ef\u4ee5\u4f7f\u7528\u7684\u516c\u5171\u8d44\u6e90\u6216\u5e38\u91cf\u3002\u5982\u679c\u9759\u6001\u53d8\u91cf\u4e0d\u662f\u79c1\u6709\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>ClassName.variableName<\/code>\u6765\u8bbf\u95ee\u5b83\u3002<\/p>\n<h4>\u9759\u6001\u53d8\u91cf\u793a\u4f8b<\/h4>\n<pre><code>private static int count;\r\npublic static String str;\r\npublic static final String DB_USER = \"myuser\";<\/code><\/pre>\n<h3>2. Java\u9759\u6001\u65b9\u6cd5<\/h3>\n<p>\u4e0e\u9759\u6001\u53d8\u91cf\u7c7b\u4f3c\uff0c\u9759\u6001\u65b9\u6cd5\u5c5e\u4e8e\u7c7b\u800c\u4e0d\u662f\u7c7b\u7684\u5b9e\u4f8b\u3002\u9759\u6001\u65b9\u6cd5\u53ea\u80fd\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf\uff0c\u5e76\u4e14\u53ea\u80fd\u8c03\u7528\u7c7b\u7684\u5176\u4ed6\u9759\u6001\u65b9\u6cd5\u3002\u901a\u5e38\uff0c\u9759\u6001\u65b9\u6cd5\u662f\u6211\u4eec\u60f3\u8981\u516c\u5f00\u4f9b\u5176\u4ed6\u7c7b\u4f7f\u7528\u7684\u5b9e\u7528\u65b9\u6cd5\uff0c\u800c\u4e0d\u9700\u8981\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\u3002\u4f8b\u5982\uff0cCollections\u7c7b\u5c31\u5305\u542b\u8bb8\u591a\u9759\u6001\u65b9\u6cd5\u3002Java\u5305\u88c5\u7c7b\u548c\u5b9e\u7528\u7a0b\u5e8f\u7c7b\u4e5f\u5305\u542b\u5927\u91cf\u9759\u6001\u65b9\u6cd5\u3002Java\u7a0b\u5e8f\u7684\u5165\u53e3\u70b9main()\u65b9\u6cd5\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n<h4>\u9759\u6001\u65b9\u6cd5\u793a\u4f8b<\/h4>\n<pre><code>\/\/ \u9759\u6001\u65b9\u6cd5\u793a\u4f8b\r\npublic static void setCount(int count) {\r\n    if(count > 0)\r\n        StaticExample.count = count;\r\n}\r\n\r\n\/\/ \u9759\u6001\u5b9e\u7528\u65b9\u6cd5\r\npublic static int addInts(int i, int...js){\r\n    int sum = i;\r\n    for(int x : js) sum += x;\r\n    return sum;\r\n}<\/code><\/pre>\n<p>\u4eceJava 8\u5f00\u59cb\uff0c\u63a5\u53e3\u4e2d\u4e5f\u53ef\u4ee5\u6709\u9759\u6001\u65b9\u6cd5\u3002\u6709\u5173\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u9605\u8bfbJava 8\u63a5\u53e3\u66f4\u6539\u7684\u76f8\u5173\u6587\u6863\u3002<\/p>\n<h3>3. Java\u9759\u6001\u4ee3\u7801\u5757<\/h3>\n<p>Java\u9759\u6001\u4ee3\u7801\u5757\u662f\u4e00\u7ec4\u5728\u7c7b\u88abJava\u7c7b\u88c5\u8f7d\u5668\u52a0\u8f7d\u5230\u5185\u5b58\u65f6\u6267\u884c\u7684\u8bed\u53e5\u3002\u9759\u6001\u5757\u4e3b\u8981\u7528\u4e8e\u521d\u59cb\u5316\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u3002\u5728\u7c7b\u52a0\u8f7d\u65f6\uff0c\u901a\u5e38\u7528\u6765\u521b\u5efa\u9759\u6001\u8d44\u6e90\u3002\u5728\u9759\u6001\u5757\u4e2d\uff0c\u6211\u4eec\u65e0\u6cd5\u8bbf\u95ee\u975e\u9759\u6001\u53d8\u91cf\u3002\u5728\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u591a\u4e2a\u9759\u6001\u4ee3\u7801\u5757\uff0c\u5c3d\u7ba1\u8fd9\u79cd\u505a\u6cd5\u6ca1\u6709\u592a\u591a\u5b9e\u9645\u610f\u4e49\u3002\u9759\u6001\u4ee3\u7801\u5757\u7684\u4ee3\u7801\u5728\u7c7b\u52a0\u8f7d\u5230\u5185\u5b58\u65f6\u53ea\u6267\u884c\u4e00\u6b21\u3002<\/p>\n<h4>\u9759\u6001\u4ee3\u7801\u5757\u793a\u4f8b<\/h4>\n<pre><code>static {\r\n    \/\/ \u53ef\u4ee5\u5728\u7c7b\u52a0\u8f7d\u65f6\u521d\u59cb\u5316\u8d44\u6e90\r\n    System.out.println(\"StaticExample\u9759\u6001\u4ee3\u7801\u5757\");\r\n    \/\/ \u53ea\u80fd\u8bbf\u95ee\u9759\u6001\u53d8\u91cf\u548c\u65b9\u6cd5\r\n    str = \"Test\";\r\n    setCount(2);\r\n}<\/code><\/pre>\n<h3>4. Java\u9759\u6001\u7c7b<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528static\u5173\u952e\u5b57\u4e0e\u5d4c\u5957\u7c7b\u4e00\u8d77\u4f7f\u7528\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9759\u6001\u5173\u952e\u5b57\u4e0d\u80fd\u4e0e\u9876\u7ea7\u7c7b\u4e00\u8d77\u4f7f\u7528\u3002\u9759\u6001\u5d4c\u5957\u7c7b\u4e0e\u4efb\u4f55\u5176\u4ed6\u9876\u7ea7\u7c7b\u76f8\u540c\uff0c\u53ea\u662f\u4e3a\u4e86\u4fbf\u4e8e\u5c01\u88c5\u800c\u5d4c\u5957\u5728\u53e6\u4e00\u4e2a\u7c7b\u4e2d\u3002\u5982\u9700\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u53ef\u4ee5\u9605\u8bfbJava\u5d4c\u5957\u7c7b\u76f8\u5173\u6587\u6863\u3002<\/p>\n<h3>Java\u4e2dstatic\u5173\u952e\u5b57\u7684\u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u5b8c\u6574\u7684\u793a\u4f8b\u7a0b\u5e8f\u6765\u4e86\u89e3Java\u4e2dstatic\u5173\u952e\u5b57\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<h4>StaticExample.java<\/h4>\n<pre><code>package com.Olivia.misc;\r\n\r\npublic class StaticExample {\r\n\r\n    \/\/ \u9759\u6001\u4ee3\u7801\u5757\r\n    static {\r\n        \/\/ \u53ef\u4ee5\u5728\u7c7b\u52a0\u8f7d\u65f6\u521d\u59cb\u5316\u8d44\u6e90\r\n        System.out.println(\"StaticExample\u9759\u6001\u4ee3\u7801\u5757\");\r\n        \/\/ \u53ea\u80fd\u8bbf\u95ee\u9759\u6001\u53d8\u91cf\u548c\u65b9\u6cd5\r\n        str = \"Test\";\r\n        setCount(2);\r\n    }\r\n    \r\n    \/\/ \u540c\u4e00\u7c7b\u4e2d\u7684\u591a\u4e2a\u9759\u6001\u4ee3\u7801\u5757\r\n    static {\r\n        System.out.println(\"StaticExample\u9759\u6001\u4ee3\u7801\u57572\");\r\n    }\r\n    \r\n    \/\/ \u9759\u6001\u53d8\u91cf\u793a\u4f8b\r\n    private static int count; \/\/ \u4fdd\u6301\u79c1\u6709\u4ee5\u901a\u8fc7setter\u63a7\u5236\u5176\u503c\r\n    public static String str;\r\n    \r\n    public int getCount() {\r\n        return count;\r\n    }\r\n\r\n    \/\/ \u9759\u6001\u65b9\u6cd5\u793a\u4f8b\r\n    public static void setCount(int count) {\r\n        if(count > 0)\r\n            StaticExample.count = count;\r\n    }\r\n    \r\n    \/\/ \u9759\u6001\u5b9e\u7528\u65b9\u6cd5\r\n    public static int addInts(int i, int...js){\r\n        int sum = i;\r\n        for(int x : js) sum += x;\r\n        return sum;\r\n    }\r\n\r\n    \/\/ \u9759\u6001\u7c7b\u793a\u4f8b - \u4ec5\u7528\u4e8e\u5305\u88c5\u4fbf\u5229\r\n    public static class MyStaticClass {\r\n        public int count;\r\n    }\r\n}<\/code><\/pre>\n<h4>TestStatic.java<\/h4>\n<pre><code>package com.Olivia.misc;\r\n\r\npublic class TestStatic {\r\n\r\n    public static void main(String[] args) {\r\n        StaticExample.setCount(5);\r\n        \r\n        \/\/ \u975e\u79c1\u6709\u9759\u6001\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7\u7c7b\u540d\u8bbf\u95ee\r\n        StaticExample.str = \"abc\";\r\n        StaticExample se = new StaticExample();\r\n        System.out.println(se.getCount());\r\n        \/\/ \u7c7b\u548c\u5b9e\u4f8b\u7684\u9759\u6001\u53d8\u91cf\u662f\u76f8\u540c\u7684\r\n        System.out.println(StaticExample.str +\" \u4e0e \"+se.str+\" \u662f\u76f8\u540c\u7684\");\r\n        System.out.println(StaticExample.str == se.str);\r\n        \r\n        \/\/ \u9759\u6001\u5d4c\u5957\u7c7b\u5c31\u50cf\u666e\u901a\u7684\u9876\u7ea7\u7c7b\u4e00\u6837\r\n        StaticExample.MyStaticClass myStaticClass = new StaticExample.MyStaticClass();\r\n        myStaticClass.count = 10;\r\n        \r\n        StaticExample.MyStaticClass myStaticClass1 = new StaticExample.MyStaticClass();\r\n        myStaticClass1.count = 20;\r\n        \r\n        System.out.println(myStaticClass.count);\r\n        System.out.println(myStaticClass1.count);\r\n    }\r\n}<\/code><\/pre>\n<h4>\u7a0b\u5e8f\u8f93\u51fa<\/h4>\n<pre><code>StaticExample\u9759\u6001\u4ee3\u7801\u5757\r\nStaticExample\u9759\u6001\u4ee3\u7801\u57572\r\n5\r\nabc \u4e0e abc \u662f\u76f8\u540c\u7684\r\ntrue\r\n10\r\n20<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u9759\u6001\u5757\u4ee3\u7801\u5728\u7c7b\u52a0\u8f7d\u5230\u5185\u5b58\u65f6\u9996\u5148\u6267\u884c\u4e00\u6b21\u3002\u5176\u4ed6\u8f93\u51fa\u90fd\u5f88\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<h3>Java\u9759\u6001\u5bfc\u5165<\/h3>\n<p>\u901a\u5e38\u6211\u4eec\u4f7f\u7528\u7c7b\u5f15\u7528\u6765\u8bbf\u95ee\u9759\u6001\u6210\u5458\uff0c\u4f46\u4eceJava 1.5\u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u9759\u6001\u5bfc\u5165\u6765\u907f\u514d\u4f7f\u7528\u7c7b\u5f15\u7528\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684Java\u9759\u6001\u5bfc\u5165\u793a\u4f8b\u3002<\/p>\n<h4>A.java<\/h4>\n<pre><code>package com.Olivia.test;\r\n\r\npublic class A {\r\n\r\n    public static int MAX = 1000;\r\n    \r\n    public static void foo() {\r\n        System.out.println(\"foo\u9759\u6001\u65b9\u6cd5\");\r\n    }\r\n}<\/code><\/pre>\n<h4>B.java<\/h4>\n<pre><code>package com.Olivia.test;\r\n\r\nimport static com.Olivia.test.A.MAX;\r\nimport static com.Olivia.test.A.foo;\r\n\r\npublic class B {\r\n\r\n    public static void main(String args[]) {\r\n        System.out.println(MAX); \/\/ \u901a\u5e38\u5199\u4f5cA.MAX\r\n        foo(); \/\/ \u901a\u5e38\u5199\u4f5cA.foo()\r\n    }\r\n}<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\u5bfc\u5165\u8bed\u53e5\uff0c\u5bf9\u4e8e\u9759\u6001\u5bfc\u5165\uff0c\u6211\u4eec\u5fc5\u987b\u4f7f\u7528<code>import static<\/code>\uff0c\u540e\u8ddf\u7c7b\u7684\u5b8c\u5168\u9650\u5b9a\u7684\u9759\u6001\u6210\u5458\u3002\u5982\u679c\u8981\u5bfc\u5165\u7c7b\u7684\u6240\u6709\u9759\u6001\u6210\u5458\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26*\uff0c\u5982<code>import static com.Olivia.test.A.*;<\/code>\u3002\u5f53\u6211\u4eec\u9891\u7e41\u4f7f\u7528\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u65f6\uff0c\u624d\u5e94\u8be5\u4f7f\u7528\u9759\u6001\u5bfc\u5165\uff0c\u56e0\u4e3a\u8fc7\u5ea6\u4f7f\u7528\u4f1a\u5bf9\u4ee3\u7801\u53ef\u8bfb\u6027\u4ea7\u751f\u4e0d\u5229\u5f71\u54cd\u3002<\/p>\n<p>\u66f4\u65b0\uff1a\u6211\u6700\u8fd1\u521b\u5efa\u4e86\u4e00\u4e2a\u89c6\u9891\u6765\u89e3\u91caJava\u4e2d\u7684\u9759\u6001\u5173\u952e\u5b57\uff0c\u4f60\u53ef\u4ee5\u5728\u4e0b\u9762\u89c2\u770b\u5b83\uff1ahttps:\/\/www.youtube.com\/watch?v=2e-l1vb\\_fwM<\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Java\u4e2d\u7684static\u5173\u952e\u5b57 Java\u4e2d\u7684static\u5173\u952e\u5b57\u5728Java\u7f16\u7a0b\u4e2d\u4f7f\u7528\u5f97\u975e\u5e38\u5e7f\u6cdb\u3002Java\u7684sta [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[183,232,180,1544,722],"class_list":{"0":"post-519","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","10":"tag-static","11":"tag-722"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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