{"id":359,"date":"2023-04-05T22:00:06","date_gmt":"2022-12-03T04:22:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b9%8b%e6%a3%98%e6%89%8b%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98\/"},"modified":"2025-08-02T01:37:33","modified_gmt":"2025-08-01T17:37:33","slug":"java%e4%b9%8b%e6%a3%98%e6%89%8b%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b9%8b%e6%a3%98%e6%89%8b%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98\/","title":{"rendered":"2023\u5e74Java\u6700\u96be\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u8be6\u89e3 &#8211; \u9ad8\u9891Java\u9762\u8bd5\u9898\u96c6\u9526"},"content":{"rendered":"<h1>Java\u4e4b\u68d8\u624b\u9762\u8bd5\u95ee\u9898<\/h1>\n<p>\u524d\u6bb5\u65f6\u95f4\uff0c\u6211\u5199\u4e86\u4e00\u7bc7\u5173\u4e8eJava\u7f16\u7a0b\u7684\u524d50\u4e2a\u95ee\u9898\u7684\u6587\u7ae0\u3002\u6211\u4eec\u7684\u8bfb\u8005\u5f88\u559c\u6b22\u3002\u6240\u4ee5\u4eca\u5929\u6211\u4eec\u6765\u770b\u4e00\u4e9b\u5173\u4e8eJava\u7684\u68d8\u624b\u7684\u9762\u8bd5\u95ee\u9898\u3002<\/p>\n<h2>Java \u9762\u8bd5\u4e2d\u7684\u68d8\u624b\u95ee\u9898<\/h2>\n<p>\u8fd9\u4e9b\u662f\u7f16\u7a0b\u95ee\u9898\uff0c\u4f46\u662f\u5982\u679c\u4f60\u5bf9Java\u6ca1\u6709\u6df1\u5165\u7684\u7406\u89e3\uff0c\u5f88\u96be\u731c\u51fa\u8f93\u51fa\u7ed3\u679c\u5e76\u89e3\u91ca\u5b83\u3002<\/p>\n<h3>1. \u7a7a\u53c2\u6570<\/h3>\n<p>\u6211\u4eec\u6709\u91cd\u8f7d\u51fd\u6570\uff0c\u5e76\u4e14\u6211\u4eec\u6b63\u5728\u4f20\u9012null\u3002\u5c06\u4f1a\u8c03\u7528\u54ea\u4e2a\u51fd\u6570\uff0c\u7a0b\u5e8f\u7684\u8f93\u51fa\u4f1a\u662f\u4ec0\u4e48\uff1f<\/p>\n<pre class=\"post-pre\"><code>public class Test {\r\n    public static void main(String[] args) {\r\n        foo(null);\r\n    }\r\n    public static void foo(Object o) {\r\n        System.out.println(\"Object argument\");\r\n    }\r\n    public static void foo(String s) {\r\n        System.out.println(\"String argument\");\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>2. \u7528&#8221;L&#8221;\u6765\u8868\u793a\u957f\u6574\u578b<\/h3>\n<p>\u4f60\u80fd\u731c\u6d4b\u4ee5\u4e0b\u9648\u8ff0\u7684\u7ed3\u679c\u5417\uff1f<\/p>\n<pre class=\"post-pre\"><code>long longWithL = 1000*60*60*24*365L;\r\nlong longWithoutL = 1000*60*60*24*365;\r\nSystem.out.println(longWithL);\r\nSystem.out.println(longWithoutL);\r\n<\/code><\/pre>\n<h3>\u7a7a\u53c2\u6570\u68d8\u624b\u95ee\u9898\u7684\u89e3\u91ca<\/h3>\n<p>\u6839\u636eJava\u89c4\u8303\uff0c\u5728\u65b9\u6cd5\u91cd\u8f7d\u7684\u60c5\u51b5\u4e0b\uff0c\u7f16\u8bd1\u5668\u4f1a\u9009\u62e9\u6700\u5177\u4f53\u7684\u51fd\u6570\u3002\u663e\u7136String\u7c7b\u6bd4Object\u7c7b\u66f4\u5177\u4f53\uff0c\u6240\u4ee5\u5b83\u5c06\u6253\u5370\u51fa&#8221;String argument&#8221;\u3002\u4f46\u662f\uff0c\u5047\u5982\u5728\u8be5\u7c7b\u4e2d\u8fd8\u6709\u4ee5\u4e0b\u65b9\u6cd5\uff0c\u90a3\u8be5\u600e\u4e48\u529e\u5462\uff1f<\/p>\n<pre class=\"post-pre\"><code>public static void foo(StringBuffer i){\r\n    System.out.println(\"StringBuffer impl\");\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cJava\u7f16\u8bd1\u5668\u4f1a\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\uff0c\u663e\u793a&#8221;\u65b9\u6cd5foo(String)\u5bf9\u4e8e\u7c7b\u578bTest\u662f\u6a21\u68f1\u4e24\u53ef\u7684&#8221;\u3002String\u548cStringBuffer\u6ca1\u6709\u7ee7\u627f\u5173\u7cfb\uff0c\u6240\u4ee5\u5b83\u4eec\u4e2d\u6ca1\u6709\u4e00\u4e2a\u6bd4\u53e6\u4e00\u4e2a\u66f4\u5177\u4f53\u3002\u5982\u679c\u7b2c\u4e00\u4e2a\u65b9\u6cd5\u7684\u4efb\u4f55\u8c03\u7528\u53ef\u4ee5\u5728\u4e0d\u4ea7\u751f\u7f16\u8bd1\u65f6\u7c7b\u578b\u9519\u8bef\u7684\u60c5\u51b5\u4e0b\u4f20\u9012\u7ed9\u53e6\u4e00\u4e2a\u65b9\u6cd5\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65b9\u6cd5\u6bd4\u53e6\u4e00\u4e2a\u65b9\u6cd5\u66f4\u5177\u4f53\u3002\u6211\u4eec\u53ef\u4ee5\u5c06String\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9Object\u7c7b\u578b\u7684\u53c2\u6570\u548cString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u4f46\u4e0d\u80fd\u4f20\u9012\u7ed9StringBuffer\u7c7b\u578b\u7684\u53c2\u6570\u65b9\u6cd5\u3002<\/p>\n<h3>\u957f\u6574\u578b\u53d8\u91cf\u7684\u89e3\u91ca<\/h3>\n<p>\u4ee3\u7801\u7247\u6bb5\u7684\u8f93\u51fa\u5c06\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>31536000000\r\n1471228928\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u5728\u7b2c\u4e00\u4e2a\u53d8\u91cf\u540e\u6dfb\u52a0&#8221;L&#8221;\u540e\u7f00\uff0c\u6211\u4eec\u660e\u786e\u5730\u5c06\u5176\u5b9a\u4e49\u4e3a\u957f\u6574\u578b\u3002\u56e0\u6b64\uff0c\u7f16\u8bd1\u5668\u4f1a\u5c06\u5176\u89c6\u4e3a\u957f\u6574\u578b\u5e76\u5c06\u5176\u8d4b\u7ed9\u7b2c\u4e00\u4e2a\u53d8\u91cf\u3002\u5bf9\u4e8e\u7b2c\u4e8c\u4e2a\u8bed\u53e5\uff0c\u7f16\u8bd1\u5668\u4f1a\u6267\u884c\u8ba1\u7b97\u5e76\u5c06\u5176\u89c6\u4e3a32\u4f4d\u6574\u6570\u3002\u7531\u4e8e\u8f93\u51fa\u503c\u8d85\u51fa\u6574\u6570\u6700\u5927\u503c\u8303\u56f4\uff082147483647\uff09\uff0c\u7f16\u8bd1\u5668\u5c06\u622a\u53d6\u6700\u9ad8\u4f4d\u5e76\u5c06\u5176\u8d4b\u7ed9\u53d8\u91cf\u3002\u4e8c\u8fdb\u5236\u7b49\u503c\u4e8e 1000*60*60*24*365L = 011101010111101100010010110000000000 (36 \u4f4d\uff09\u3002\u5728\u53bb\u63894\u4e2a\u6700\u9ad8\u4f4d\u4ee5\u9002\u5e9432\u4f4d\u6574\u6570\u540e\uff0c\u65b0\u503c\u4e3a 01010111101100010010110000000000 (32 \u4f4d\uff09\u3002\u8fd9\u7b49\u4e8e1471228928\uff0c\u5373\u4e3a\u8f93\u51fa\u3002\u6700\u8fd1\uff0c\u6211\u5236\u4f5c\u4e86\u4e00\u7cfb\u5217Java\u96be\u9898\u7a0b\u5e8f\u7684YouTube\u89c6\u9891\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ed3\u5e93\u4e2d\u67e5\u770b\u66f4\u591a\u7684Java\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u4e4b\u68d8\u624b\u9762\u8bd5\u95ee\u9898 \u524d\u6bb5\u65f6\u95f4\uff0c\u6211\u5199\u4e86\u4e00\u7bc7\u5173\u4e8eJava\u7f16\u7a0b\u7684\u524d50\u4e2a\u95ee\u9898\u7684\u6587\u7ae0\u3002\u6211\u4eec\u7684\u8bfb\u8005\u5f88\u559c\u6b22\u3002\u6240\u4ee5\u4eca\u5929\u6211 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[761,180,1189],"class_list":["post-359","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>2023\u5e74Java\u6700\u96be\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u8be6\u89e3 - \u9ad8\u9891Java\u9762\u8bd5\u9898\u96c6\u9526 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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