{"id":626,"date":"2023-11-04T04:32:38","date_gmt":"2023-12-07T07:41:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84switch-case%e8%af%ad%e5%8f%a5%e7%94%a8%e4%ba%8e%e5%af%b9%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bf%9b%e8%a1%8c%e5%88%a4%e6%96%ad%e5%92%8c%e9%80%89%e6%8b%a9%e3%80%82\/"},"modified":"2025-08-02T23:35:08","modified_gmt":"2025-08-02T15:35:08","slug":"java%e4%b8%ad%e7%9a%84switch-case%e8%af%ad%e5%8f%a5%e7%94%a8%e4%ba%8e%e5%af%b9%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bf%9b%e8%a1%8c%e5%88%a4%e6%96%ad%e5%92%8c%e9%80%89%e6%8b%a9%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84switch-case%e8%af%ad%e5%8f%a5%e7%94%a8%e4%ba%8e%e5%af%b9%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bf%9b%e8%a1%8c%e5%88%a4%e6%96%ad%e5%92%8c%e9%80%89%e6%8b%a9%e3%80%82\/","title":{"rendered":"Java switch case\u8bed\u53e5\uff1a\u5b57\u7b26\u4e32\u5224\u65ad\u4e0e\u9009\u62e9\u6559\u7a0b"},"content":{"rendered":"

\u4eca\u5929\u6211\u4eec\u5c06\u7814\u7a76Java\u4e2d\u7684Switch Case\u5b57\u7b26\u4e32\u793a\u4f8b\u3002\u4f5c\u4e3a\u4e00\u540dJava\u7a0b\u5e8f\u5458\uff0c\u6211\u6df1\u77e5\u5b57\u7b26\u4e32\u7684\u91cd\u8981\u6027\u53ca\u5176\u5728\u6761\u4ef6\u6d41\u7a0b\u4e2d\u7684\u9ad8\u9891\u4f7f\u7528\u3002\u65e0\u8bba\u60a8\u662f\u9700\u8981\u6839\u636e\u4e0d\u540c\u8f93\u5165\u5b57\u7b26\u4e32\u5c55\u73b0\u4e0d\u540c\u884c\u4e3a\u7684\u7b80\u5355\u65b9\u6cd5\uff0c\u8fd8\u662f\u7528\u4e8e\u68c0\u67e5\u4f20\u5165\u52a8\u4f5c\u5e76\u76f8\u5e94\u5904\u7406\u7684Servlet\u63a7\u5236\u5668\u7c7b\uff0c\u6211\u4eec\u90fd\u4f1a\u4f7f\u7528\u5b57\u7b26\u4e32\u8fdb\u884c\u6bd4\u8f83\u4ee5\u786e\u5b9a\u7a0b\u5e8f\u6d41\u7a0b\u3002<\/p>\n

Java\u4e2d\u7684Switch Case\u8bed\u53e5<\/h2>\n

\u5728\u7f16\u5199\u6761\u4ef6\u6d41\u4ee3\u7801\u65f6\uff0cJava\u7684switch case\u662f\u4e00\u79cd\u5f88\u597d\u7684\u65b9\u5f0f\uff0c\u7c7b\u4f3c\u4e8e\u4f7f\u7528if-else\u6761\u4ef6\u8bed\u53e5\u3002\u5728Java 7\u4e4b\u524d\uff0c\u5b9e\u73b0\u57fa\u4e8e\u5b57\u7b26\u4e32\u7684\u6761\u4ef6\u6d41\u7684\u552f\u4e00\u65b9\u6cd5\u662f\u4f7f\u7528if-else\u6761\u4ef6\u3002\u4f46\u662fJava 7\u6539\u8fdb\u4e86switch case\u529f\u80fd\uff0c\u4f7f\u5176\u652f\u6301\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\n

Java switch case\u5b57\u7b26\u4e32\u793a\u4f8b<\/h3>\n

\u6211\u5728\u8fd9\u91cc\u63d0\u4f9b\u4e00\u4e2aJava\u7a0b\u5e8f\uff0c\u5c55\u793a\u5728switch case\u8bed\u53e5\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u7684\u7528\u6cd5\u3002\u4e3a\u4e86\u8fdb\u884c\u6bd4\u8f83\uff0c\u6211\u8fd8\u63d0\u4f9b\u4e86\u53e6\u4e00\u79cd\u4f7f\u7528if-else\u6761\u4ef6\u8bed\u53e5\u5b9e\u73b0\u76f8\u540c\u6761\u4ef6\u6d41\u7a0b\u7684\u65b9\u6cd5\u3002\u6587\u4ef6\u540d\uff1aSwitchStringExample.java<\/p>\n

package com.Olivia.util;\r\n\r\npublic class SwitchStringExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tprintColorUsingSwitch(\"red\");\r\n\t\tprintColorUsingIf(\"red\");\r\n\t\t\/\/ switch case\u5b57\u7b26\u4e32\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\r\n\t\tprintColorUsingSwitch(\"RED\");\r\n\t\tprintColorUsingSwitch(null);\r\n\t}\r\n\r\n\tprivate static void printColorUsingIf(String color) {\r\n\t\tif (color.equals(\"blue\")) {\r\n\t\t\tSystem.out.println(\"BLUE\");\r\n\t\t} else if (color.equals(\"red\")) {\r\n\t\t\tSystem.out.println(\"RED\");\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"INVALID COLOR CODE\");\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static void printColorUsingSwitch(String color) {\r\n\t\tswitch (color) {\r\n\t\tcase \"blue\":\r\n\t\t\tSystem.out.println(\"BLUE\");\r\n\t\t\tbreak;\r\n\t\tcase \"red\":\r\n\t\t\tSystem.out.println(\"RED\");\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tSystem.out.println(\"INVALID COLOR CODE\");\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
\u8fd9\u662f\u4e0a\u8ff0\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
RED\r\nRED\r\nINVALID COLOR CODE\r\nException in thread \"main\"\r\njava.lang.NullPointerException\r\n\tat com.Olivia.util.SwitchStringExample.printColorUsingSwitch(SwitchStringExample.java:24)\r\n\tat com.Olivia.util.SwitchStringExample.main(SwitchStringExample.java:10)\r\n<\/code><\/pre>\n
\u4e86\u89e3Java switch case\u8bed\u53e5\u4e2d\u7684\u5173\u952e\u8981\u70b9\uff1a<\/p>\n
    \n
  • switch\u8bed\u53e5\u4e2d\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/li>\n
  • \u6bcf\u4e2acase\u5fc5\u987b\u4f7f\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u4f5c\u4e3a\u6bd4\u8f83\u503c\u3002<\/li>\n
  • \u4f7f\u7528break\u8bed\u53e5\u6765\u8df3\u51faswitch\u8bed\u53e5\u5757\u3002<\/li>\n
  • \u53ef\u4ee5\u4f7f\u7528default\u5173\u952e\u5b57\u5b9a\u4e49\u5f53\u6ca1\u6709\u5339\u914d\u7684case\u65f6\u6267\u884c\u7684\u4ee3\u7801\u5757\u3002<\/li>\n<\/ul>\n
      \n
    • Java\u7684switch case\u8bed\u53e5\u53ef\u4ee5\u901a\u8fc7\u79fb\u9664\u591a\u4e2aif-else-if\u5d4c\u5957\u6761\u4ef6\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u53ef\u8bfb\u3002<\/li>\n
    • Java\u7684switch case\u8bed\u53e5\u5bf9\u5b57\u7b26\u4e32\u5927\u5c0f\u5199\u654f\u611f\uff0c\u793a\u4f8b\u7684\u8f93\u51fa\u8bc1\u5b9e\u4e86\u8fd9\u4e00\u70b9\u3002<\/li>\n
    • Java\u7684switch case\u8bed\u53e5\u4f7f\u7528String.equals()\u65b9\u6cd5\u5c06\u4f20\u5165\u7684\u503c\u4e0ecase\u503c\u8fdb\u884c\u6bd4\u8f83\uff0c\u56e0\u6b64\u8bf7\u786e\u4fdd\u6dfb\u52a0\u7a7a\u6307\u9488\u68c0\u67e5\u4ee5\u907f\u514dNullPointerException\u3002<\/li>\n
    • \u6839\u636eJava 7\u5173\u4e8eSwitch\u4e2d\u5b57\u7b26\u4e32\u7684\u6587\u6863\uff0cJava\u7f16\u8bd1\u5668\u4e3aSwitch\u8bed\u53e5\u4e2d\u7684\u5b57\u7b26\u4e32\u751f\u6210\u66f4\u9ad8\u6548\u7684\u5b57\u8282\u7801\uff0c\u6bd4\u4f7f\u7528\u5d4c\u5957\u7684if-else-if\u8bed\u53e5\u66f4\u9ad8\u6548\u3002<\/li>\n
    • \u8bf7\u786e\u4fdd\u53ea\u6709\u5728\u786e\u5b9a\u5c06\u4e0eJava 7\u4e00\u8d77\u4f7f\u7528switch case\u5b57\u7b26\u4e32\u65f6\u624d\u4f7f\u7528\u5b83\uff0c\u5426\u5219\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662fJava switch case\u5b57\u7b26\u4e32\u793a\u4f8b\u7684\u5168\u90e8\u5185\u5bb9\u3002\u63d0\u793a\uff1a\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u4e09\u5143\u8fd0\u7b97\u7b26\u6765\u4ee3\u66ffswitch\u8bed\u53e5\uff0c\u4ee5\u51cf\u5c11\u4ee3\u7801\u91cf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u4eca\u5929\u6211\u4eec\u5c06\u7814\u7a76Java\u4e2d\u7684Switch Case\u5b57\u7b26\u4e32\u793a\u4f8b\u3002\u4f5c\u4e3a\u4e00\u540dJava\u7a0b\u5e8f\u5458\uff0c\u6211\u6df1\u77e5\u5b57\u7b26\u4e32\u7684\u91cd\u8981\u6027\u53ca\u5176\u5728 […]<\/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":[189,180,1767,181,451],"class_list":{"0":"post-626","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-switch-case","10":"tag-181","11":"tag-451"},"yoast_head":"\nJava switch case\u8bed\u53e5\uff1a\u5b57\u7b26\u4e32\u5224\u65ad\u4e0e\u9009\u62e9\u6559\u7a0b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u8be6\u7ec6\u4ecb\u7ecdJava\u4e2d\u5982\u4f55\u4f7f\u7528switch case\u8bed\u53e5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5224\u65ad\u548c\u9009\u62e9\u3002\u5305\u542b\u5b9e\u7528\u793a\u4f8b\u3001\u6700\u4f73\u5b9e\u8df5\u548c\u5e38\u89c1\u95ee\u9898\u89e3\u7b54\uff0c\u5e2e\u52a9Java\u5f00\u53d1\u8005\u638c\u63e1\u5b57\u7b26\u4e32\u5904\u7406\u6280\u5de7\uff0c\u63d0\u9ad8\u4ee3\u7801\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684switch-case\u8bed\u53e5\u7528\u4e8e\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5224\u65ad\u548c\u9009\u62e9\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java switch case\u8bed\u53e5\uff1a\u5b57\u7b26\u4e32\u5224\u65ad\u4e0e\u9009\u62e9\u6559\u7a0b\" \/>\n<meta property=\"og:description\" content=\"\u8be6\u7ec6\u4ecb\u7ecdJava\u4e2d\u5982\u4f55\u4f7f\u7528switch case\u8bed\u53e5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5224\u65ad\u548c\u9009\u62e9\u3002\u5305\u542b\u5b9e\u7528\u793a\u4f8b\u3001\u6700\u4f73\u5b9e\u8df5\u548c\u5e38\u89c1\u95ee\u9898\u89e3\u7b54\uff0c\u5e2e\u52a9Java\u5f00\u53d1\u8005\u638c\u63e1\u5b57\u7b26\u4e32\u5904\u7406\u6280\u5de7\uff0c\u63d0\u9ad8\u4ee3\u7801\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684switch-case\u8bed\u53e5\u7528\u4e8e\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5224\u65ad\u548c\u9009\u62e9\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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