{"id":12,"date":"2023-01-29T08:06:10","date_gmt":"2023-08-19T23:50:26","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%b0%86-java-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%a4%a7%e5%86%99\/"},"modified":"2025-07-31T20:47:34","modified_gmt":"2025-07-31T12:47:34","slug":"%e5%b0%86-java-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%a4%a7%e5%86%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%86-java-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%a4%a7%e5%86%99\/","title":{"rendered":"Java\u5b57\u7b26\u4e32\u8f6c\u5927\u5199\u7ec8\u6781\u6307\u5357\uff1a\u6df1\u5165\u89e3\u6790toUpperCase()\u65b9\u6cd5\u4e0e\u5b9e\u6218\u5e94\u7528"},"content":{"rendered":"<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u662f\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002Java \u63d0\u4f9b\u4e86 <code>String<\/code> \u7c7b\u7684 <code>toUpperCase()<\/code> \u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\u3002\u672c\u6587\u5c06\u5168\u9762\u4ecb\u7ecd\u8be5\u65b9\u6cd5\u7684\u4f7f\u7528\u65b9\u6cd5\u3001\u53d8\u4f53\u3001\u6ce8\u610f\u4e8b\u9879\u4ee5\u53ca\u5b9e\u9645\u5e94\u7528\u793a\u4f8b\u3002<\/p>\n<h2>Java \u5b57\u7b26\u4e32\u8f6c\u5927\u5199<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd0a4b2f92e6c72c558\/2-0.png\" alt=\"Java \u5b57\u7b26\u4e32\u8f6c\u5927\u5199\" \/><\/div>\n<ul class=\"post-ul\">\n<li>Java <code>String<\/code> \u7684 <code>toUpperCase()<\/code> \u65b9\u6cd5\u6709\u4e24\u79cd\u53d8\u4f53\uff1a\u4e0d\u5e26\u53c2\u6570\u7684 <code>toUpperCase()<\/code> \u548c\u5e26 <code>Locale<\/code>\uff08\u8bed\u8a00\u73af\u5883\uff09\u53c2\u6570\u7684 <code>toUpperCase(Locale locale)<\/code>\u3002<\/li>\n<li>\u5b57\u7b26\u8f6c\u6362\u4e3a\u5927\u5199\u4f7f\u7528\u7684\u662f<b>\u9ed8\u8ba4\u8bed\u8a00\u73af\u5883<\/b>\u7684\u89c4\u5219\u3002\u8c03\u7528\u65e0\u53c2\u65b9\u6cd5\u7b49\u540c\u4e8e\u8c03\u7528 <code>toUpperCase(Locale.getDefault())<\/code>\u3002<\/li>\n<li>\u8be5\u65b9\u6cd5<b>\u5bf9\u8bed\u8a00\u73af\u5883\u654f\u611f<\/b>\uff0c\u5904\u7406\u4e0e\u8bed\u8a00\u73af\u5883\u65e0\u5173\u7684\u5b57\u7b26\u4e32\uff08\u5982\u7f16\u7a0b\u8bed\u8a00\u6807\u8bc6\u7b26\u3001HTML \u6807\u7b7e\u3001\u534f\u8bae\u5bc6\u94a5\u7b49\uff09\u65f6\u8981\u683c\u5916\u5c0f\u5fc3\uff0c\u5426\u5219\u53ef\u80fd\u4ea7\u751f\u610f\u5916\u7ed3\u679c\u3002<\/li>\n<li>\u8981\u83b7\u5f97\u4e0e\u8bed\u8a00\u73af\u5883\u65e0\u5173\u7684\u5b57\u7b26\u4e32\u7684\u6b63\u786e\u5927\u5199\u7ed3\u679c\uff0c\u8bf7\u4f7f\u7528 <code>toUpperCase(Locale.ROOT)<\/code> \u65b9\u6cd5\u3002<\/li>\n<li><code>toUpperCase()<\/code> \u8fd4\u56de<b>\u65b0\u5b57\u7b26\u4e32<\/b>\uff0c\u9700\u8981\u5c06\u7ed3\u679c\u8d4b\u503c\u7ed9\u65b0\u53d8\u91cf\u3002\u539f\u59cb\u5b57\u7b26\u4e32\u4fdd\u6301\u4e0d\u53d8\uff0c\u56e0\u4e3a <code>String<\/code> \u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3002<\/li>\n<li>\u5411 <code>toUpperCase(Locale locale)<\/code> \u4f20\u5165 <code>null<\/code> \u53c2\u6570\u5c06\u629b\u51fa <code>NullPointerException<\/code>\uff08\u7a7a\u6307\u9488\u5f02\u5e38\uff09\u3002<\/li>\n<\/ul>\n<h3>Java \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u7684\u793a\u4f8b<\/h3>\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u57fa\u7840\u793a\u4f8b\u7406\u89e3\u8be5\u65b9\u6cd5\u7684\u4f7f\u7528\uff1a<\/p>\n<pre class=\"post-pre\"><code>String str = \"Hello World!\";\r\nSystem.out.println(str.toUpperCase()); \/\/\u8f93\u51fa\uff1a\u201cHELLO WORLD!\u201d<\/code><\/pre>\n<p>\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u5e38\u9700\u8981\u5904\u7406\u7528\u6237\u8f93\u5165\u3002\u4ee5\u4e0b\u5b8c\u6574\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u7ed3\u5408 <code>Scanner<\/code> \u7c7b\u5b9e\u73b0\u4ea4\u4e92\u5f0f\u8f6c\u6362\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.string;\r\n\r\nimport java.util.Scanner;\r\n\r\npublic class JavaStringToUpperCase {\r\n\tpublic static void main(String[] args) {\r\n\t\tString str = \"hello World!\";\r\n\r\n\t\tString strUpperCase = str.toUpperCase();\r\n\r\n\t\tSystem.out.println(\"Java \u5b57\u7b26\u4e32\u8f6c\u5927\u5199: \" + strUpperCase);\r\n\r\n\t\treadUserInputAndPrintInUpperCase();\r\n\t}\r\n\r\n\tprivate static void readUserInputAndPrintInUpperCase() {\r\n\t\tScanner sc = new Scanner(System.in);\r\n\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u5b57\u7b26\u4e32\u5e76\u6309\u56de\u8f66\u952e\uff1a\");\r\n\t\tString str = sc.nextLine();\r\n\t\tSystem.out.println(\"\u8f6c\u6362\u4e3a\u5927\u5199\u7684\u8f93\u5165\u5b57\u7b26\u4e32 = \" + str.toUpperCase());\r\n\t\tsc.close();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u6267\u884c\u8be5\u7a0b\u5e8f\u5c06\u751f\u6210\u5982\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>Java \u5b57\u7b26\u4e32\u8f6c\u5927\u5199: HELLO WORLD!\r\n\u8bf7\u8f93\u5165\u5b57\u7b26\u4e32\u5e76\u6309\u56de\u8f66\u952e\uff1a\r\nWelcome to JournalDev Tutorials\r\n\u8f6c\u6362\u4e3a\u5927\u5199\u7684\u8f93\u5165\u5b57\u7b26\u4e32 = WELCOME TO JOURNALDEV TUTORIALS<\/code><\/pre>\n<p>\u638c\u63e1 <code>toUpperCase()<\/code> \u65b9\u6cd5\u5bf9\u5b57\u7b26\u4e32\u5904\u7406\u81f3\u5173\u91cd\u8981\u3002\u66f4\u591a\u6280\u672f\u7ec6\u8282\u8bf7\u53c2\u8003 Java \u5b98\u65b9 API \u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u662f\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002Java \u63d0\u4f9b\u4e86 String \u7c7b\u7684 toUpperC [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,183,225,223,232,180,226,182,243,181,190,224,184,244],"class_list":{"0":"post-12","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","13":"tag-locale","14":"tag-touppercase","15":"tag-243","16":"tag-181","17":"tag-190","18":"tag-224","19":"tag-184","20":"tag-244"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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