{"id":2200,"date":"2025-03-01T18:32:47","date_gmt":"2025-03-01T10:32:47","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2200"},"modified":"2025-03-01T18:32:47","modified_gmt":"2025-03-01T10:32:47","slug":"java-switch-case-%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/01\/java-switch-case-%e8%af%ad%e5%8f%a5\/","title":{"rendered":"Java switch case \u8bed\u53e5"},"content":{"rendered":"\n

switch<\/code> \u8bed\u53e5\u662f Java \u4e2d\u7684\u4e00\u79cd\u63a7\u5236\u7ed3\u6784\uff0c\u7528\u4e8e\u5728\u591a\u4e2a\u9009\u9879\u4e4b\u95f4\u8fdb\u884c\u9009\u62e9\u3002\u5b83\u63d0\u4f9b\u4e86\u6bd4\u591a\u4e2a if...else<\/code> \u8bed\u53e5\u66f4\u7b80\u6d01\u548c\u9ad8\u6548\u7684\u65b9\u5f0f\u6765\u5904\u7406\u591a\u4e2a\u6761\u4ef6\u7684\u5224\u65ad\u3002<\/p>\n\n\n\n

1. switch \u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n
switch (\u8868\u8fbe\u5f0f) {\n    case \u5e38\u91cf1:\n        \/\/ \u5f53\u8868\u8fbe\u5f0f\u7684\u503c\u7b49\u4e8e\u5e38\u91cf1\u65f6\uff0c\u6267\u884c\u6b64\u4ee3\u7801\n        break;\n    case \u5e38\u91cf2:\n        \/\/ \u5f53\u8868\u8fbe\u5f0f\u7684\u503c\u7b49\u4e8e\u5e38\u91cf2\u65f6\uff0c\u6267\u884c\u6b64\u4ee3\u7801\n        break;\n    case \u5e38\u91cf3:\n        \/\/ \u5f53\u8868\u8fbe\u5f0f\u7684\u503c\u7b49\u4e8e\u5e38\u91cf3\u65f6\uff0c\u6267\u884c\u6b64\u4ee3\u7801\n        break;\n    default:\n        \/\/ \u5982\u679c\u6ca1\u6709\u4efb\u4f55\u4e00\u4e2a case \u5339\u914d\u65f6\uff0c\u6267\u884c\u6b64\u4ee3\u7801\n}<\/code><\/pre>\n\n\n\n
    \n
  • \u8868\u8fbe\u5f0f<\/strong>\uff1a\u53ef\u4ee5\u662f\u6574\u6570\u7c7b\u578b\uff08byte<\/code>\u3001short<\/code>\u3001char<\/code>\u3001int<\/code>\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u679a\u4e3e\u7c7b\u578b\u3001String<\/code> \u6216\u8005 var<\/code>\uff08Java 14 \u5f15\u5165\uff09\u3002<\/li>\n\n\n\n
  • case<\/strong>\uff1a\u7528\u6765\u5339\u914d\u8868\u8fbe\u5f0f\u7684\u53ef\u80fd\u503c\uff0c\u5e38\u91cf\u503c\u53ef\u4ee5\u662f int<\/code>\u3001char<\/code>\u3001String<\/code> \u7b49\u7c7b\u578b\u3002<\/li>\n\n\n\n
  • break<\/strong>\uff1a\u7528\u4e8e\u7ec8\u6b62 switch<\/code> \u8bed\u53e5\u5757\u7684\u6267\u884c\uff0c\u9632\u6b62\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a case<\/code>\u3002\u5982\u679c\u6ca1\u6709 break<\/code>\uff0cswitch<\/code> \u4f1a\u7ee7\u7eed\u6267\u884c\u63a5\u4e0b\u6765\u7684 case<\/code>\uff0c\u5373\u201c\u7a7f\u900f\u201d\u3002<\/li>\n\n\n\n
  • default<\/strong>\uff1a\u53ef\u9009\u9879\uff0c\u5982\u679c\u6ca1\u6709\u4efb\u4f55 case<\/code> \u5339\u914d\uff0cdefault<\/code> \u4f1a\u6267\u884c\u3002default<\/code> \u53ef\u4ee5\u653e\u5728\u4efb\u4f55\u4f4d\u7f6e\uff0c\u4f46\u901a\u5e38\u653e\u5728\u6240\u6709 case<\/code> \u8bed\u53e5\u7684\u6700\u540e\u3002<\/li>\n<\/ul>\n\n\n\n
    2. switch \u8bed\u53e5\u7684\u793a\u4f8b<\/strong><\/h3>\n\n\n\n
    \u793a\u4f8b 1\uff1a\u4f7f\u7528\u6574\u6570\u7c7b\u578b\u8fdb\u884c\u5339\u914d<\/h4>\n\n\n\n
    int day = 3;\nswitch (day) {\n    case 1:\n        System.out.println(\"\u661f\u671f\u4e00\");\n        break;\n    case 2:\n        System.out.println(\"\u661f\u671f\u4e8c\");\n        break;\n    case 3:\n        System.out.println(\"\u661f\u671f\u4e09\");\n        break;\n    case 4:\n        System.out.println(\"\u661f\u671f\u56db\");\n        break;\n    case 5:\n        System.out.println(\"\u661f\u671f\u4e94\");\n        break;\n    case 6:\n        System.out.println(\"\u661f\u671f\u516d\");\n        break;\n    case 7:\n        System.out.println(\"\u661f\u671f\u5929\");\n        break;\n    default:\n        System.out.println(\"\u65e0\u6548\u7684\u8f93\u5165\");\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    \u661f\u671f\u4e09<\/code><\/pre>\n\n\n\n
    \u793a\u4f8b 2\uff1a\u4f7f\u7528 String<\/code> \u8fdb\u884c\u5339\u914d\uff08Java 7 \u53ca\u4ee5\u540e\u652f\u6301\uff09<\/h4>\n\n\n\n
    String fruit = \"apple\";\nswitch (fruit) {\n    case \"apple\":\n        System.out.println(\"\u82f9\u679c\");\n        break;\n    case \"banana\":\n        System.out.println(\"\u9999\u8549\");\n        break;\n    case \"orange\":\n        System.out.println(\"\u6a59\u5b50\");\n        break;\n    default:\n        System.out.println(\"\u672a\u77e5\u6c34\u679c\");\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    \u82f9\u679c<\/code><\/pre>\n\n\n\n
    3. switch \u8bed\u53e5\u7684\u7279\u70b9<\/strong><\/h3>\n\n\n\n
      \n
    • \u6548\u7387<\/strong>\uff1aswitch<\/code> \u8bed\u53e5\u901a\u5e38\u6bd4\u591a\u91cd if...else<\/code> \u5224\u65ad\u8bed\u53e5\u6267\u884c\u6548\u7387\u66f4\u9ad8\uff0c\u5c24\u5176\u662f\u5f53\u6709\u591a\u4e2a case<\/code> \u65f6\u3002<\/li>\n\n\n\n
    • \u5339\u914d\u7c7b\u578b<\/strong>\uff1aswitch<\/code> \u8bed\u53e5\u8981\u6c42\u8868\u8fbe\u5f0f\u548c case<\/code> \u7684\u503c\u5fc5\u987b\u662f\u76f8\u540c\u7c7b\u578b\uff0c\u4e14 Java 7 \u53ca\u4ee5\u540e\u7248\u672c\u652f\u6301\u4f7f\u7528 String<\/code> \u7c7b\u578b\u8fdb\u884c\u5339\u914d\u3002<\/li>\n\n\n\n
    • \u53ef\u8bfb\u6027<\/strong>\uff1a\u5f53\u6709\u591a\u4e2a\u6761\u4ef6\u9700\u8981\u5224\u65ad\u65f6\uff0c\u4f7f\u7528 switch<\/code> \u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\uff0c\u6613\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n\n\n\n
      4. \u6ca1\u6709 break \u7684\u60c5\u51b5\uff08\u7a7f\u900f\uff09<\/strong><\/h3>\n\n\n\n
      \u5982\u679c\u5728\u67d0\u4e2a case<\/code> \u4e2d\u6ca1\u6709 break<\/code>\uff0c\u4ee3\u7801\u4f1a\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a case<\/code>\uff0c\u5373\u4f7f\u6761\u4ef6\u4e0d\u5339\u914d\uff0c\u8fd9\u79cd\u884c\u4e3a\u79f0\u4e3a\u201c\u7a7f\u900f\u201d\u3002\u8fd9\u79cd\u60c5\u51b5\u6709\u65f6\u662f\u6709\u610f\u4e3a\u4e4b\uff0c\u4f46\u5728\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u4f7f\u7528 break<\/code> \u6765\u907f\u514d\u5b83\u3002<\/p>\n\n\n\n
      \u793a\u4f8b\uff1a\u6ca1\u6709 break<\/code> \u7684\u7a7f\u900f<\/h4>\n\n\n\n
      int day = 3;\nswitch (day) {\n    case 1:\n        System.out.println(\"\u661f\u671f\u4e00\");\n    case 2:\n        System.out.println(\"\u661f\u671f\u4e8c\");\n    case 3:\n        System.out.println(\"\u661f\u671f\u4e09\");\n    default:\n        System.out.println(\"\u672a\u77e5\");\n}<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      \u661f\u671f\u4e09\n\u672a\u77e5<\/code><\/pre>\n\n\n\n
      \u7531\u4e8e\u6ca1\u6709 break<\/code>\uff0c\u4ee3\u7801\u4f1a\u4ece case 3<\/code> \u6267\u884c\u5230 default<\/code>\u3002<\/p>\n\n\n\n
      5. \u4f7f\u7528\u591a\u4e2a case<\/code> \u6807\u7b7e\u6765\u6267\u884c\u76f8\u540c\u7684\u4ee3\u7801<\/strong><\/h3>\n\n\n\n
      \u4f60\u53ef\u4ee5\u5c06\u591a\u4e2a case<\/code> \u6807\u7b7e\u5408\u5e76\u6765\u6267\u884c\u76f8\u540c\u7684\u4ee3\u7801\uff0c\u800c\u65e0\u9700\u4e3a\u6bcf\u4e2a case<\/code> \u7f16\u5199\u91cd\u590d\u7684\u4ee3\u7801\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
      int day = 1;\nswitch (day) {\n    case 1:\n    case 2:\n    case 3:\n        System.out.println(\"\u5de5\u4f5c\u65e5\");\n        break;\n    case 4:\n    case 5:\n        System.out.println(\"\u5468\u672b\");\n        break;\n    default:\n        System.out.println(\"\u672a\u77e5\");\n}<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      \u5de5\u4f5c\u65e5<\/code><\/pre>\n\n\n\n
      6. switch \u8bed\u53e5\u4e2d\u7684 var<\/code>\uff08Java 14 \u5f15\u5165\uff09<\/strong><\/h3>\n\n\n\n
      \u5728 Java 14 \u53ca\u4ee5\u540e\u7248\u672c\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 var<\/code> \u6765\u4ee3\u66ff switch<\/code> \u8868\u8fbe\u5f0f\u4e2d\u7684\u7c7b\u578b\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n
      var day = 2;\nswitch (day) {\n    case 1 -> System.out.println(\"\u661f\u671f\u4e00\");\n    case 2 -> System.out.println(\"\u661f\u671f\u4e8c\");\n    case 3 -> System.out.println(\"\u661f\u671f\u4e09\");\n    default -> System.out.println(\"\u65e0\u6548\u7684\u8f93\u5165\");\n}<\/code><\/pre>\n\n\n\n
      \u8fd9\u79cd\u5f62\u5f0f\u53eb\u505a\u7bad\u5934\u8bed\u6cd5\uff08Arrow Syntax\uff09<\/strong>\uff0c\u5b83\u662f switch<\/code> \u8868\u8fbe\u5f0f\u7684\u4e00\u79cd\u65b0\u7528\u6cd5\uff0c\u63d0\u4f9b\u4e86\u66f4\u52a0\u7b80\u6d01\u7684\u8868\u8fbe\u65b9\u5f0f\u3002<\/p>\n\n\n\n
      \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
        \n
      • switch<\/code> \u8bed\u53e5\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6709\u6548\u7684\u65b9\u5f0f\u6765\u5904\u7406\u591a\u4e2a\u6761\u4ef6\u3002<\/li>\n\n\n\n
      • \u5b83\u6bd4\u591a\u4e2a if...else<\/code> \u8bed\u53e5\u66f4\u7b80\u6d01\uff0c\u5c24\u5176\u662f\u5728\u6761\u4ef6\u5f88\u591a\u65f6\uff0cswitch<\/code> \u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6267\u884c\u6548\u7387\u3002<\/li>\n\n\n\n
      • switch<\/code> \u652f\u6301\u591a\u79cd\u7c7b\u578b\uff0c\u5305\u62ec\u6574\u6570\u3001\u5b57\u7b26\u3001\u679a\u4e3e\u7c7b\u578b\u548c String<\/code> \u7c7b\u578b\uff08Java 7 \u53ca\u4ee5\u540e\uff09\u3002<\/li>\n\n\n\n
      • switch<\/code> \u4e2d\u7684 case<\/code> \u6807\u7b7e\u9700\u8981\u4e0e\u8868\u8fbe\u5f0f\u7684\u7c7b\u578b\u4e00\u81f4\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7 break<\/code> \u9632\u6b62\u201c\u7a7f\u900f\u201d\u73b0\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n
        \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        switch \u8bed\u53e5\u662f Java \u4e2d\u7684\u4e00\u79cd\u63a7\u5236\u7ed3\u6784\uff0c\u7528\u4e8e\u5728\u591a\u4e2a\u9009\u9879\u4e4b\u95f4\u8fdb\u884c\u9009\u62e9\u3002\u5b83\u63d0\u4f9b\u4e86\u6bd4\u591a\u4e2a if…els […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-2200","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2200"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2200\/revisions"}],"predecessor-version":[{"id":2201,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2200\/revisions\/2201"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}