{"id":11537,"date":"2022-12-29T16:20:52","date_gmt":"2022-12-29T08:20:52","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=11537"},"modified":"2022-12-29T18:31:44","modified_gmt":"2022-12-29T10:31:44","slug":"java%e6%8e%a5%e5%8f%a3%e7%9a%84%e4%bf%ae%e9%a5%b0%e7%ac%a6%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/11537.html","title":{"rendered":"java\u63a5\u53e3\u7684\u4fee\u9970\u7b26\u6709\u54ea\u4e9b"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>java\u63a5\u53e3\u7684\u4fee\u9970\u7b26\u6709\uff1a1. \u8bbf\u95ee\u63a7\u5236\u4fee\u9970\u7b26\uff1b2. \u975e\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u5176\u4e2d\uff0c\u975e\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u5982default (\u5373\u9ed8\u8ba4\uff0c\u4ec0\u4e48\u4e5f\u4e0d\u5199\uff09\u662f\u5728\u540c\u4e00\u5305\u5185\u53ef\u89c1\uff0c\u4e0d\u4f7f\u7528\u4efb\u4f55\u4fee\u9970\u7b26\u3002\u4f7f\u7528\u5bf9\u8c61\uff1a\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u3001\u65b9\u6cd5\u3002<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"680\" height=\"421\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2022\/12\/\u9ed8\u8ba4\u6807\u9898__2022-12-29-18_26_05-1.png?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"\" class=\"wp-image-11603\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2022\/12\/\u9ed8\u8ba4\u6807\u9898__2022-12-29-18_26_05-1.png 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2022\/12\/\u9ed8\u8ba4\u6807\u9898__2022-12-29-18_26_05-1-300x186.png 300w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001java\u63a5\u53e3\u7684\u4fee\u9970\u7b26<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. <\/strong><strong>\u8bbf\u95ee\u63a7\u5236\u4fee\u9970\u7b26<\/strong><\/h3>\n\n\n\n<p>Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u8bbf\u95ee\u63a7\u5236\u7b26\u6765\u4fdd\u62a4\u5bf9\u7c7b\u3001\u53d8\u91cf\u3001\u65b9\u6cd5\u548c\u6784\u9020\u65b9\u6cd5\u7684\u8bbf\u95ee\u3002Java \u652f\u6301 4 \u79cd\u4e0d\u540c\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/p>\n\n\n\n<p>default (\u5373\u9ed8\u8ba4\uff0c\u4ec0\u4e48\u4e5f\u4e0d\u5199\uff09: \u5728\u540c\u4e00\u5305\u5185\u53ef\u89c1\uff0c\u4e0d\u4f7f\u7528\u4efb\u4f55\u4fee\u9970\u7b26\u3002\u4f7f\u7528\u5bf9\u8c61\uff1a\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u3001\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>private : \u5728\u540c\u4e00\u7c7b\u5185\u53ef\u89c1\u3002\u4f7f\u7528\u5bf9\u8c61\uff1a\u53d8\u91cf\u3001\u65b9\u6cd5\u3002 \u6ce8\u610f\uff1a\u4e0d\u80fd\u4fee\u9970\u7c7b\uff08\u5916\u90e8\u7c7b\uff09<\/p>\n\n\n\n<p>public : \u5bf9\u6240\u6709\u7c7b\u53ef\u89c1\u3002\u4f7f\u7528\u5bf9\u8c61\uff1a\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u3001\u65b9\u6cd5<\/p>\n\n\n\n<p>protected : \u5bf9\u540c\u4e00\u5305\u5185\u7684\u7c7b\u548c\u6240\u6709\u5b50\u7c7b\u53ef\u89c1\u3002\u4f7f\u7528\u5bf9\u8c61\uff1a\u53d8\u91cf\u3001\u65b9\u6cd5\u3002 \u6ce8\u610f\uff1a\u4e0d\u80fd\u4fee\u9970\u7c7b\uff08\u5916\u90e8\u7c7b\uff09\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. <\/strong><strong>\u975e\u8bbf\u95ee\u4fee\u9970\u7b26<\/strong><\/h3>\n\n\n\n<p>\u4e3a\u4e86\u5b9e\u73b0\u4e00\u4e9b\u5176\u4ed6\u7684\u529f\u80fd\uff0cJava \u4e5f\u63d0\u4f9b\u4e86\u8bb8\u591a\u975e\u8bbf\u95ee\u4fee\u9970\u7b26\u3002<\/p>\n\n\n\n<p>static \u4fee\u9970\u7b26\uff0c\u7528\u6765\u4fee\u9970\u7c7b\u65b9\u6cd5\u548c\u7c7b\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>final \u4fee\u9970\u7b26\uff0c\u7528\u6765\u4fee\u9970\u7c7b\u3001\u65b9\u6cd5\u548c\u53d8\u91cf\uff0cfinal \u4fee\u9970\u7684\u7c7b\u4e0d\u80fd\u591f\u88ab\u7ee7\u627f\uff0c\u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u7ee7\u627f\u7c7b\u91cd\u65b0\u5b9a\u4e49\uff0c\u4fee\u9970\u7684\u53d8\u91cf\u4e3a\u5e38\u91cf\uff0c\u662f\u4e0d\u53ef\u4fee\u6539\u7684\u3002<\/p>\n\n\n\n<p>abstract \u4fee\u9970\u7b26\uff0c\u7528\u6765\u521b\u5efa\u62bd\u8c61\u7c7b\u548c\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>synchronized \u548c volatile \u4fee\u9970\u7b26\uff0c\u4e3b\u8981\u7528\u4e8e\u7ebf\u7a0b\u7684\u7f16\u7a0b\u3002<\/p>\n\n\n\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u62bd\u8c61\u7c7b\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5<\/strong><\/h4>\n\n\n\n<p>\u62bd\u8c61\u7c7b\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5(\u5176\u524d\u6709 abstract1\u4fee\u9970)\u4e0d\u80fd\u7528 private\u3001 static\u3001 synchronized\u3001native\u8bbf\u56de\u4fee\u9970\u7b26\u4fee\u9970\u3002\u539f\u56e0\u5982\u4e0b:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. private<\/strong><\/h3>\n\n\n\n<p>\u62bd\u8c61\u65b9\u6cd5\u6ca1\u6709\u65b9\u6cd5\u4f53,\u662f\u7528\u6765\u88ab\u7ee7\u627f\u7684,\u6240\u4ee5\u4e0d\u80fd\u7528 private\u4fee\u9970;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.static<\/strong><\/h3>\n\n\n\n<p>static\u4fee\u9970\u7684\u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7\u7c7b\u540d\u6765\u8bbf\u95f4\u8be5\u65b9\u6cd5(\u5373\u8be5\u65b9\u6cd5\u7684\u65b9\u6cd5\u4f53),\u62bd\u8c61\u65b9\u6cd5\u7528sttic\u4fee\u9970\u6ca1\u6709\u610f\u4e49;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. synchronized<\/strong><\/h3>\n\n\n\n<p>\u8be5\u5173\u952e\u5b57\u662f\u4e3a\u8be5\u65b9\u6cd5\u52a0\u4e00\u4e2a\u9501\u3002\u800c\u5982\u679c\u8be5\u5173\u952e\u5b57\u4fee\u9970\u7684\u65b9\u6cd5\u662f static\u65b9\u6cd5\u3002\u5219\u4f7f\u7528\u7684\u9501\u5c31\u662fclass\u53d8\u91cf\u7684\u9501\u3002\u5982\u679c\u662f\u4fee\u9970\u7c7b\u65b9\u6cd5\u3002\u5219\u7528this\u53d8\u91cf\u9501\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u62bd\u8c61\u7c7b\u4e0d\u80fd\u5b9e\u4f8b\u5316\u5bf9\u8c61,\u56e0\u4e3a\u8be5\u65b9\u6cd5\u4e0d\u662f\u5728\u8be5\u62bd\u8c61\u7c7b\u4e2d\u5b9e\u73b0\u7684\u3002\u662f\u5728\u5176\u5b50\u7c7b\u5b9e\u73b0\u7684\u3002\u6240\u4ee5\uff0c\u9501\u5e94\u8be5\u5f52\u5176\u5b50\u7c7b\u6240\u6709\u3002\u6240\u4ee5\uff0c\u62bd\u8c61\u65b9\u6cd5\u4e5f\u5c31\u4e0d\u80fd\u7528 synchronized\u5173\u952e\u5b57\u4fee\u9970\u4e86;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. native<\/strong><\/h3>\n\n\n\n<p>native\u8fd9\u4e2a\u4e1c\u897f\u672c\u8eab\u5c31\u548c abstract\u51b2\u7a81,\u4ed6\u4eec\u90fd\u662f\u65b9\u6cd5\u7684\u58f0\u660e,\u53ea\u662f\u4e00\u4e2a\u628a\u65b9\u6cd5\u5b9e\u73b0\u79fb\u4ea4\u7ed9\u5b50\u7c7b,\u53e6\u4e00\u4e2a\u662f\u79fb\u4ea4\u7ed9\u672c\u5730\u64cd\u4f5c\u7cfb\u7edf\u3002\u5982\u679c\u540c\u65f6\u51fa\u73b0,\u5c31\u76f8\u5f53\u4e8e\u5373\u628a\u5b9e\u73b0\u79fb\u4ea4\u7ed9\u5b50\u7c7b,\u53c8\u628a\u5b9e\u73b0\u79fb\u4ea4\u7ed9\u672c\u5730\u64cd\u4f5c\u7cfb\u7edf,\u90a3\u5230\u5e95\u8c01\u6765\u5b9e\u73b0\u5177\u4f53\u65b9\u6cd5\u5462<\/p>\n\n\n\n<p>\u63a5\u53e3\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u62bd\u8c61\u7c7b,\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u5168\u90e8\u662f\u62bd\u8c61\u65b9\u6cd5(\u4f46\u5176\u524d\u7684 abstract\u53ef\u4ee5\u7701\u7565),\u6240\u4ee5\u62bd\u8c61\u7c7b\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5\u4e0d\u80fd\u7528\u7684\u8bbf\u95f4\u4fee\u9970\u7b26\u8fd9\u91cc\u4e5f\u4e0d\u80fd\u7528\u3002\u540c\u65f6\u989d\u5916\u8bf4\u660e\u4e00\u4e0bprotect\u5173\u952e\u8bcd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5.protect<\/strong><\/h3>\n\n\n\n<p>protected\u8bbf\u540c\u4fee\u9970\u7b26\u4e5f\u4e0d\u80fd\u4f7f\u7528,\u56e0\u4e3a\u63a5\u53e3\u53ef\u4ee5\u8ba9\u6240\u6709\u7684\u7c7b\u53bb\u5b9e\u73b0(\u975e\u7ee7\u627f),\u4e0d\u53ea\u662f\u5176\u5b50\u7c7b,\u4f46\u662f\u8981\u7528public\u53bb\u4fee\u9970\u3002\u63a5\u53e3\u53ef\u4ee5\u53bb\u7ee7\u627f\u4e00\u4e2a\u5df2\u6709\u7684\u63a5\u53e3\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8ejava\u63a5\u53e3\u4fee\u9970\u7b26\u7684\u5185\u5bb9\u5e0c\u671b\u5bf9\u5927\u5bb6\u6709\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"java\u63a5\u53e3\u7684\u4fee\u9970\u7b26\u6709\uff1a1. \u8bbf\u95ee\u63a7\u5236\u4fee\u9970\u7b26\uff1b2. \u975e\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u5176\u4e2d\uff0c\u975e\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u5982default (\u5373\u9ed8 [&hellip;]","protected":false},"author":1,"featured_media":11603,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/11537"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=11537"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/11537\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/11603"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=11537"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=11537"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=11537"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}