{"id":378,"date":"2023-11-30T05:29:08","date_gmt":"2023-11-07T01:19:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e8%ae%bf%e9%97%ae%e4%bf%ae%e9%a5%b0%e7%ac%a6\/"},"modified":"2025-08-02T02:57:47","modified_gmt":"2025-08-01T18:57:47","slug":"java%e8%ae%bf%e9%97%ae%e4%bf%ae%e9%a5%b0%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e8%ae%bf%e9%97%ae%e4%bf%ae%e9%a5%b0%e7%ac%a6\/","title":{"rendered":"Java\u8bbf\u95ee\u4fee\u9970\u7b26\u5b8c\u5168\u6307\u5357\uff1apublic\u3001private\u3001protected\u4e0e\u9ed8\u8ba4\u8bbf\u95ee\u6743\u9650\u8be6\u89e3"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u8bbf\u95ee\u4fee\u9970\u7b26\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<h2>Java \u8bbf\u95ee\u4fee\u9970\u7b26<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u8bbf\u95ee\u4fee\u9970\u7b26\u7528\u4e8e\u63d0\u4f9b\u5bf9Java\u7684\u8bbf\u95ee\u63a7\u5236\u3002Java\u901a\u8fc7\u4e09\u4e2a\u5173\u952e\u5b57\uff08private\u3001protected\u548cpublic\uff09\u63d0\u4f9b\u8bbf\u95ee\u63a7\u5236\u3002\u6211\u4eec\u5e76\u975e\u603b\u662f\u5fc5\u987b\u4f7f\u7528\u8fd9\u4e9b\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u56e0\u6b64\u8fd8\u6709\u4e00\u79cd\u79f0\u4e3a&#8221;\u9ed8\u8ba4\u8bbf\u95ee&#8221;\u3001&#8221;\u5305\u79c1\u6709&#8221;\u6216&#8221;\u65e0\u4fee\u9970\u7b26&#8221;\u7684\u4fee\u9970\u7b26\u53ef\u4f9b\u4f7f\u7528\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u8bbf\u95ee\u4fee\u9970\u7b26\u6765\u63a7\u5236\u7c7b\u3001\u7c7b\u53d8\u91cf\u548c\u65b9\u6cd5\u7684\u8bbf\u95ee\u6743\u9650\u3002\u5bf9\u4e8eJava\u7c7b\uff0c\u6211\u4eec\u53ea\u5141\u8bb8\u4f7f\u7528&#8221;public&#8221;\u6216&#8221;default&#8221;\u8bbf\u95ee\u4fee\u9970\u7b26\u3002<\/p>\n<ul>\n<li>\u5982\u679c\u4e00\u4e2a\u7c7b\u662f&#8221;\u516c\u5171\u7684&#8221;\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u4ece\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u5b83\uff0c\u5373\u4ece\u4efb\u4f55\u4f4d\u4e8e\u5176\u4ed6\u5305\u4e2d\u7684\u5176\u4ed6\u7c7b\u4e2d\u8bbf\u95ee\u5b83\u7b49\u7b49\u3002<\/li>\n<li>\u6211\u4eec\u5728\u6e90\u6587\u4ef6\u4e2d\u53ea\u80fd\u6709\u4e00\u4e2a&#8221;\u516c\u5171\u7684&#8221;\u7c7b\uff0c\u6587\u4ef6\u540d\u5e94\u4e0e\u516c\u5171\u7c7b\u7684\u540d\u79f0\u76f8\u540c\u3002<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u7c7b\u5177\u6709&#8221;\u9ed8\u8ba4\u8bbf\u95ee\u6743\u9650&#8221;\uff0c\u90a3\u4e48\u5b83\u53ea\u80fd\u4ece\u540c\u4e00\u5305\u4e2d\u7684\u5176\u4ed6\u7c7b\u4e2d\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<h3>Java \u7c7b\u6210\u5458\u7684\u8bbf\u95ee\u4fee\u9970\u7b26<\/h3>\n<p>\u5728\u7c7b\u6210\u5458\u53d8\u91cf\u548c\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u62e5\u6709\u56db\u79cd\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u7136\u800c\uff0c\u6210\u5458\u8bbf\u95ee\u4fee\u9970\u7b26\u89c4\u5219\u4f1a\u5728\u7c7b\u7ea7\u522b\u8bbf\u95ee\u89c4\u5219\u4e4b\u540e\u5e94\u7528\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u4e2a\u7c7b\u5177\u6709\u9ed8\u8ba4\u8bbf\u95ee\u6743\u9650\uff0c\u5219\u5728\u5176\u4ed6\u5305\u4e2d\u5c06\u65e0\u6cd5\u770b\u5230\u8be5\u7c7b\uff0c\u56e0\u6b64\u8be5\u7c7b\u7684\u65b9\u6cd5\u548c\u53d8\u91cf\u4e5f\u5c06\u4e0d\u53ef\u89c1\u3002\u6211\u4eec\u5c06\u5206\u522b\u7814\u7a76\u6bcf\u4e00\u79cd\u4fee\u9970\u7b26\uff0c\u7136\u540e\u4ee5\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\u5c55\u793aJava\u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u7528\u6cd5\u3002<\/p>\n<h3>Java\u8bbf\u95ee\u4fee\u9970\u7b26 &#8211; \u516c\u5171\u5173\u952e\u5b57<\/h3>\n<p>\u5982\u679c\u4e00\u4e2a\u7c7b\u6210\u5458\u662f &#8220;public&#8221;\uff0c\u90a3\u4e48\u5b83\u53ef\u4ee5\u4ece\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u3002\u8be5\u6210\u5458\u53d8\u91cf\u6216\u65b9\u6cd5\u53ef\u4ee5\u5168\u5c40\u8bbf\u95ee\u3002\u8fd9\u662f\u63d0\u4f9b\u5bf9\u7c7b\u6210\u5458\u8bbf\u95ee\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u3002\u7136\u800c\uff0c\u6211\u4eec\u5e94\u8be5\u5c0f\u5fc3\u4f7f\u7528\u8fd9\u4e2a\u5173\u952e\u5b57\u4e0e\u7c7b\u53d8\u91cf\uff0c\u5426\u5219\u4efb\u4f55\u4eba\u90fd\u53ef\u4ee5\u6539\u53d8\u8fd9\u4e9b\u503c\u3002\u901a\u5e38\uff0c\u7c7b\u53d8\u91cf\u88ab\u4fdd\u5b58\u4e3a\u79c1\u6709\u7684\uff0c\u5e76\u63d0\u4f9b\u4e86getter-setter\u65b9\u6cd5\u6765\u64cd\u4f5c\u5b83\u4eec\u3002<\/p>\n<h3>Java \u8bbf\u95ee\u4fee\u9970\u7b26 &#8211; private \u5173\u952e\u5b57<\/h3>\n<p>\u5982\u679c\u4e00\u4e2a\u7c7b\u6210\u5458\u662f&#8221;private&#8221;\uff0c\u90a3\u4e48\u5b83\u53ea\u80fd\u5728\u540c\u4e00\u4e2a\u7c7b\u5185\u90e8\u8bbf\u95ee\u3002\u8fd9\u662f\u6700\u53d7\u9650\u5236\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u7c7b\u6210\u5458\u5c06\u5bf9\u5916\u754c\u4e0d\u53ef\u89c1\u3002\u901a\u5e38\uff0c\u6211\u4eec\u5c06\u7c7b\u53d8\u91cf\u8bbe\u7f6e\u4e3aprivate\uff0c\u5e76\u5c06\u53ea\u7528\u4e8e\u7c7b\u5185\u90e8\u7684\u65b9\u6cd5\u4e5f\u8bbe\u7f6e\u4e3aprivate\u3002<\/p>\n<h3>Java\u8bbf\u95ee\u4fee\u9970\u7b26 &#8211; protected\u5173\u952e\u5b57<\/h3>\n<p>\u5982\u679c\u7c7b\u6210\u5458\u662f&#8221;protected&#8221;\uff0c\u90a3\u4e48\u5b83\u53ea\u80fd\u88ab\u540c\u4e00\u4e2a\u5305\u4e2d\u7684\u7c7b\u548c\u5b50\u7c7b\u8bbf\u95ee\u3002\u8fd9\u4e2a\u4fee\u9970\u7b26\u6bd4private\u7684\u8bbf\u95ee\u6743\u9650\u66f4\u5c0f\uff0c\u4f46\u6bd4public\u7684\u8bbf\u95ee\u6743\u9650\u66f4\u5927\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f7f\u7528\u8fd9\u4e2a\u5173\u952e\u5b57\u6765\u786e\u4fdd\u7c7b\u53d8\u91cf\u53ea\u80fd\u88ab\u5b50\u7c7b\u8bbf\u95ee\u3002<\/p>\n<h3>Java \u8bbf\u95ee\u4fee\u9970\u7b26 &#8211; \u9ed8\u8ba4\u8bbf\u95ee<\/h3>\n<p>\u5982\u679c\u4e00\u4e2a\u7c7b\u6210\u5458\u6ca1\u6709\u6307\u5b9a\u4efb\u4f55\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u5219\u4f1a\u88ab\u89c6\u4e3a\u9ed8\u8ba4\u8bbf\u95ee\u3002\u8bbf\u95ee\u89c4\u5219\u4e0e\u7c7b\u76f8\u4f3c\uff0c\u5177\u6709\u9ed8\u8ba4\u8bbf\u95ee\u7684\u7c7b\u6210\u5458\u53ea\u5bf9\u540c\u4e00\u4e2a\u5305\u4e2d\u7684\u7c7b\u53ef\u8bbf\u95ee\u3002\u8fd9\u79cd\u8bbf\u95ee\u6743\u9650\u6bd4\u516c\u5171\u548c\u53d7\u4fdd\u62a4\u66f4\u53d7\u9650\uff0c\u4f46\u6bd4\u79c1\u6709\u66f4\u5f00\u653e\u3002<\/p>\n<p>\uff08\u6700\u4e0d\u53ef\u8bbf\u95ee\uff09\u79c1\u6709 &lt; \u9ed8\u8ba4 &lt; \u53d7\u4fdd\u62a4 &lt; \u516c\u5171\uff08\u6700\u53ef\u8bbf\u95ee\uff09<\/p>\n<p>\u4e0b\u8868\u603b\u7ed3\u4e86\u4e0a\u8ff0\u8bbf\u95ee\u4fee\u9970\u7b26\u4e0e\u540c\u4e00\u5305\u6216\u5176\u4ed6\u5305\u4e2d\u7684\u4e0d\u540c\u7c7b\u548c\u5b50\u7c7b\u76f8\u5173\u7684\u60c5\u51b5\u3002\u8ba9\u6211\u4eec\u7f16\u5199\u4e00\u4e9b\u7b80\u5355\u7684\u7c7b\uff0c\u4ee5\u5c55\u793aJava\u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u4f5c\u7528\u3002<\/p>\n<h4>TestA.java<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.access;\r\n\r\nclass TestA {\r\n\r\n    public void methodPublic(){\r\n        methodPrivate();\r\n    }\r\n    \r\n    protected void methodProtected(){\r\n        methodPrivate();\r\n    }\r\n    \r\n    void methodDefault(){\r\n        methodPrivate();\r\n    }\r\n    \r\n    private void methodPrivate(){}\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0cTestA\u7c7b\u5177\u6709\u9ed8\u8ba4\u8bbf\u95ee\u6743\u9650\uff0c\u800c\u79c1\u6709\u7c7b\u65b9\u6cd5\u5bf9\u4e8e\u540c\u4e00\u7c7b\u7684\u6240\u6709\u5176\u4ed6\u90e8\u5206\u662f\u53ef\u8bbf\u95ee\u7684\u3002<\/p>\n<h4>TestB.java<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.access;\r\n\r\nimport com.Olivia.access.TestA;\r\n\r\npublic class TestB {\r\n\r\n    public static void main(String args[]) {\r\n        new TestA().methodPublic();\r\n        new TestA().methodProtected();\r\n        new TestA().methodDefault();\r\n    }\r\n\r\n    public void methodPublic() {\r\n\r\n    }\r\n\r\n    protected void methodProtected() {\r\n\r\n    }\r\n\r\n    void methodDefault() {\r\n\r\n    }\r\n\r\n    private void methodPrivate() {\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0cTestB\u7c7b\u4e0eTestA\u7c7b\u4f4d\u4e8e\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u56e0\u6b64\u5b83\u80fd\u591f\u8bbf\u95ee\u5b83\u7684\u7c7b\u6210\u5458\u3002\u867d\u7136\u79c1\u6709\u6210\u5458\u65e0\u6cd5\u8bbf\u95ee\uff0c\u4f46\u7531\u4e8e\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u5176\u4ed6\u6240\u6709\u6210\u5458\u90fd\u662f\u53ef\u8bbf\u95ee\u7684\u3002<\/p>\n<h4>TestC.java<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.access.child;\r\n\r\nimport com.Olivia.access.TestB;\r\n\r\npublic class TestC {\r\n\r\n    public static void main(String[] args) {\r\n        new TestB().methodPublic();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7531\u4e8eTestB\u7c7b\u662fpublic\u7684\uff0c\u6240\u4ee5\u53ef\u4ee5\u8bbf\u95ee\u5b83\u3002\u53ea\u6709TestB\u7c7b\u7684public\u6210\u5458\u53ef\u4ee5\u88ab\u8bbf\u95ee\uff0c\u56e0\u4e3aTestC\u7c7b\u4e0d\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u4e5f\u4e0d\u662fTestB\u7684\u5b50\u7c7b\u3002<\/p>\n<h4>TestE.java<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.util;\r\n\r\nimport com.Olivia.access.TestB;\r\n\r\npublic class TestE extends TestB {\r\n\r\n    public static void main(String[] args) {\r\n        new TestB().methodPublic();\r\n        new TestB().methodProtected(); \/\/ \u7f16\u8bd1\u65f6\u9519\u8bef\r\n\r\n        \/\/ \u6709\u6548\uff0c\u901a\u8fc7\u5b50\u7c7b\u8bbf\u95ee\u8d85\u7c7b\u7684protected\u65b9\u6cd5\r\n        new TestE().methodProtected();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7531\u4e8eTestE\u7c7b\u662fTestB\u7c7b\u7684\u5b50\u7c7b\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b50\u7c7bTestE\u8bbf\u95eeTestB\u7684protected\u6210\u5458\u3002\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u76f4\u63a5\u8bbf\u95ee\u8d85\u7c7b\u7684protected\u65b9\u6cd5\uff0c\u5c06\u4f1a\u5f97\u5230\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u5173\u4e8eJava\u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u6240\u6709\u5185\u5bb9\uff0c\u5f88\u5bb9\u6613\u7406\u89e3\u3002\u53ea\u662f\u4e0d\u8981\u5c06\u9ed8\u8ba4\u8bbf\u95ee\u548cprotected\u8bbf\u95ee\u5f04\u6df7\u3002\u4e00\u4e2a\u7b80\u5355\u7684\u8bb0\u5fc6\u65b9\u6cd5\u662f\uff0c\u9ed8\u8ba4\u8bbf\u95ee\u6bd4protected\u8bbf\u95ee\u66f4\u53d7\u9650\u5236\uff0c\u800cprotected\u6210\u5458\u5728\u5b50\u7c7b\u4e2d\u662f\u53ef\u4ee5\u8bbf\u95ee\u7684\u3002\u6700\u8fd1\uff0c\u6211\u5236\u4f5c\u4e86\u4e00\u4e2a\u8be6\u7ec6\u89e3\u91caJava\u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u89c6\u9891\uff0c\u4f60\u53ef\u4ee5\u5728\u4e0b\u65b9\u7684YouTube\u94fe\u63a5\u4e2d\u89c2\u770b\u3002<\/p>\n<p><iframe loading=\"lazy\" title=\"Java Access Modifiers - private, default, protected and public\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/QKjnbC3UBtY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u8bbf\u95ee\u4fee\u9970\u7b26\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 Java \u8bbf\u95ee\u4fee\u9970\u7b26 \u5728Java\u4e2d\uff0c\u8bbf\u95ee\u4fee\u9970\u7b26\u7528\u4e8e\u63d0\u4f9b 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