{"id":2196,"date":"2025-03-01T18:30:45","date_gmt":"2025-03-01T10:30:45","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2196"},"modified":"2025-03-01T18:30:45","modified_gmt":"2025-03-01T10:30:45","slug":"java-%e5%be%aa%e7%8e%af%e7%bb%93%e6%9e%84-for-while-%e5%8f%8a-do-while","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/01\/java-%e5%be%aa%e7%8e%af%e7%bb%93%e6%9e%84-for-while-%e5%8f%8a-do-while\/","title":{"rendered":"Java \u5faa\u73af\u7ed3\u6784 – for, while \u53ca do…while"},"content":{"rendered":"\n

Java \u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u8981\u7684\u5faa\u73af\u7ed3\u6784\uff0c\u7528\u4e8e\u91cd\u590d\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\uff0c\u76f4\u5230\u6ee1\u8db3\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u5b83\u4eec\u5206\u522b\u662f\uff1afor<\/code> \u5faa\u73af\u3001while<\/code> \u5faa\u73af\u548c do...while<\/code> \u5faa\u73af\u3002<\/p>\n\n\n\n

1. for \u5faa\u73af<\/strong><\/h3>\n\n\n\n

for<\/code> \u5faa\u73af\u901a\u5e38\u7528\u4e8e\u5df2\u77e5\u5faa\u73af\u6b21\u6570\u7684\u60c5\u51b5\u3002\u5b83\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n

for (\u521d\u59cb\u5316\u8bed\u53e5; \u5faa\u73af\u6761\u4ef6; \u66f4\u65b0\u8bed\u53e5) {\n    \/\/ \u5faa\u73af\u4f53\n}<\/code><\/pre>\n\n\n\n
    \n
  • \u521d\u59cb\u5316\u8bed\u53e5<\/strong>\uff1a\u5728\u5faa\u73af\u5f00\u59cb\u524d\u6267\u884c\u4e00\u6b21\uff0c\u7528\u4e8e\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n\n\n\n
  • \u5faa\u73af\u6761\u4ef6<\/strong>\uff1a\u6bcf\u6b21\u8fed\u4ee3\u524d\u5224\u65ad\u662f\u5426\u6ee1\u8db3\u6761\u4ef6\uff0c\u82e5\u4e3a true<\/code> \u5219\u6267\u884c\u5faa\u73af\u4f53\uff0c\u82e5\u4e3a false<\/code> \u5219\u9000\u51fa\u5faa\u73af\u3002<\/li>\n\n\n\n
  • \u66f4\u65b0\u8bed\u53e5<\/strong>\uff1a\u6bcf\u6b21\u8fed\u4ee3\u540e\u6267\u884c\u4e00\u6b21\uff0c\u901a\u5e38\u7528\u4e8e\u66f4\u65b0\u5faa\u73af\u63a7\u5236\u53d8\u91cf\u3002<\/li>\n<\/ul>\n\n\n\n
    \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
    for (int i = 0; i < 5; i++) {\n    System.out.println(\"i = \" + i);\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    i = 0\ni = 1\ni = 2\ni = 3\ni = 4<\/code><\/pre>\n\n\n\n
    2. while \u5faa\u73af<\/strong><\/h3>\n\n\n\n
    while<\/code> \u5faa\u73af\u7528\u4e8e\u5728\u6761\u4ef6\u6ee1\u8db3\u65f6\u91cd\u590d\u6267\u884c\u5faa\u73af\u4f53\u3002\u4e0e for<\/code> \u5faa\u73af\u4e0d\u540c\uff0cwhile<\/code> \u5faa\u73af\u7684\u6761\u4ef6\u5224\u65ad\u662f\u5728\u5faa\u73af\u5f00\u59cb\u65f6\u8fdb\u884c\u7684\uff0c\u4e14\u53ea\u6709\u5f53\u6761\u4ef6\u4e3a true<\/code> \u65f6\u624d\u4f1a\u6267\u884c\u5faa\u73af\u4f53\u3002<\/p>\n\n\n\n
    \u8bed\u6cd5\uff1a<\/p>\n\n\n\n
    while (\u5faa\u73af\u6761\u4ef6) {\n    \/\/ \u5faa\u73af\u4f53\n}<\/code><\/pre>\n\n\n\n
      \n
    • \u5faa\u73af\u6761\u4ef6<\/strong>\uff1a\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e4b\u524d\u5224\u65ad\uff0c\u5982\u679c\u4e3a true<\/code> \u5219\u6267\u884c\u5faa\u73af\u4f53\uff0c\u82e5\u4e3a false<\/code> \u5219\u9000\u51fa\u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
      \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
      int i = 0;\nwhile (i < 5) {\n    System.out.println(\"i = \" + i);\n    i++;\n}<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      i = 0\ni = 1\ni = 2\ni = 3\ni = 4<\/code><\/pre>\n\n\n\n
      3. do\u2026while \u5faa\u73af<\/strong><\/h3>\n\n\n\n
      do...while<\/code> \u5faa\u73af\u4e0e while<\/code> \u5faa\u73af\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cdo...while<\/code> \u4f1a\u5148\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53\uff0c\u7136\u540e\u518d\u5224\u65ad\u6761\u4ef6\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5faa\u73af\u4f53\u81f3\u5c11\u4f1a\u6267\u884c\u4e00\u6b21\u3002<\/p>\n\n\n\n
      \u8bed\u6cd5\uff1a<\/p>\n\n\n\n
      do {\n    \/\/ \u5faa\u73af\u4f53\n} while (\u5faa\u73af\u6761\u4ef6);<\/code><\/pre>\n\n\n\n
        \n
      • \u5faa\u73af\u6761\u4ef6<\/strong>\uff1a\u6bcf\u6b21\u5faa\u73af\u4f53\u6267\u884c\u5b8c\u540e\u8fdb\u884c\u5224\u65ad\uff0c\u5982\u679c\u4e3a true<\/code>\uff0c\u5219\u7ee7\u7eed\u6267\u884c\u5faa\u73af\uff0c\u5426\u5219\u9000\u51fa\u3002<\/li>\n<\/ul>\n\n\n\n
        \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
        int i = 0;\ndo {\n    System.out.println(\"i = \" + i);\n    i++;\n} while (i < 5);<\/code><\/pre>\n\n\n\n
        \u8f93\u51fa\uff1a<\/p>\n\n\n\n
        i = 0\ni = 1\ni = 2\ni = 3\ni = 4<\/code><\/pre>\n\n\n\n
        \u5faa\u73af\u7ed3\u6784\u7684\u603b\u7ed3\uff1a<\/h3>\n\n\n\n
          \n
        • for \u5faa\u73af<\/strong>\uff1a\u5f53\u4f60\u77e5\u9053\u5faa\u73af\u7684\u6b21\u6570\u65f6\uff0c\u4f7f\u7528 for<\/code> \u5faa\u73af\u6700\u4e3a\u5408\u9002\u3002<\/li>\n\n\n\n
        • while \u5faa\u73af<\/strong>\uff1a\u5f53\u4f60\u4e8b\u5148\u4e0d\u77e5\u9053\u5faa\u73af\u7684\u6b21\u6570\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u6761\u4ef6\u6765\u63a7\u5236\u65f6\uff0c\u4f7f\u7528 while<\/code> \u5faa\u73af\u3002<\/li>\n\n\n\n
        • do\u2026while \u5faa\u73af<\/strong>\uff1a\u5f53\u4f60\u9700\u8981\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53\uff0c\u4e14\u5faa\u73af\u7684\u7ee7\u7eed\u4e0e\u5426\u53d6\u51b3\u4e8e\u6761\u4ef6\u65f6\uff0c\u4f7f\u7528 do...while<\/code> \u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
          \u5faa\u73af\u63a7\u5236\u8bed\u53e5\uff1a<\/h3>\n\n\n\n
          Java \u4e2d\u7684\u5faa\u73af\u4e5f\u652f\u6301\u4e00\u4e9b\u63a7\u5236\u8bed\u53e5\uff0c\u7528\u4e8e\u8df3\u51fa\u6216\u8df3\u8fc7\u5faa\u73af\u4e2d\u7684\u67d0\u4e9b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
            \n
          • break<\/code><\/strong>\uff1a\u9000\u51fa\u5f53\u524d\u5faa\u73af\uff0c\u8df3\u51fa\u5faa\u73af\u4f53\u3002<\/li>\n\n\n\n
          • continue<\/code><\/strong>\uff1a\u8df3\u8fc7\u5f53\u524d\u5faa\u73af\u7684\u5269\u4f59\u90e8\u5206\uff0c\u5f00\u59cb\u4e0b\u4e00\u6b21\u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
            \u793a\u4f8b\uff08\u4f7f\u7528 break<\/code> \u548c continue<\/code>\uff09\uff1a<\/h4>\n\n\n\n
            for (int i = 0; i < 5; i++) {\n    if (i == 3) {\n        break;  \/\/ \u5f53 i \u4e3a 3 \u65f6\uff0c\u8df3\u51fa\u5faa\u73af\n    }\n    System.out.println(\"i = \" + i);\n}\n\nSystem.out.println(\"\u7ee7\u7eed\u6267\u884c...\");\n\nfor (int i = 0; i < 5; i++) {\n    if (i == 2) {\n        continue;  \/\/ \u5f53 i \u4e3a 2 \u65f6\uff0c\u8df3\u8fc7\u5f53\u524d\u5faa\u73af\uff0c\u76f4\u63a5\u5f00\u59cb\u4e0b\u4e00\u6b21\u5faa\u73af\n    }\n    System.out.println(\"i = \" + i);\n}<\/code><\/pre>\n\n\n\n
            \u8f93\u51fa\uff1a<\/p>\n\n\n\n
            i = 0\ni = 1\ni = 2\n\u7ee7\u7eed\u6267\u884c...\ni = 0\ni = 1\ni = 3\ni = 4<\/code><\/pre>\n\n\n\n
            \u8fd9\u4e9b\u5faa\u73af\u7ed3\u6784\u548c\u63a7\u5236\u8bed\u53e5\u8ba9\u6211\u4eec\u53ef\u4ee5\u7075\u6d3b\u5730\u63a7\u5236\u4ee3\u7801\u7684\u6267\u884c\u8fc7\u7a0b\uff0c\u5904\u7406\u91cd\u590d\u4efb\u52a1\u6216\u8fdb\u884c\u6761\u4ef6\u5224\u65ad\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            Java \u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u8981\u7684\u5faa\u73af\u7ed3\u6784\uff0c\u7528\u4e8e\u91cd\u590d\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\uff0c\u76f4\u5230\u6ee1\u8db3\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u5b83\u4eec\u5206\u522b\u662f\uff1afor \u5faa\u73af\u3001whi […]<\/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-2196","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2196","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=2196"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2196\/revisions"}],"predecessor-version":[{"id":2197,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2196\/revisions\/2197"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}