{"id":46607,"date":"2023-08-03T22:02:01","date_gmt":"2023-08-03T14:02:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=46607"},"modified":"2023-08-03T22:02:02","modified_gmt":"2023-08-03T14:02:02","slug":"for%e5%92%8cforeach%e7%9a%84%e5%8c%ba%e5%88%ab%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/46607.html","title":{"rendered":"for\u548cforeach\u7684\u533a\u522b\u662f\u4ec0\u4e48"},"content":{"rendered":"\n
\n

\u5728\u8bb8\u591a\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0cfor\u548cforeach\u90fd\u662f\u7528\u4e8e\u5faa\u73af\u7684\u5173\u952e\u5b57\uff0c\u4f46\u5b83\u4eec\u5728\u4f7f\u7528\u548c\u529f\u80fd\u4e0a\u6709\u4e00\u4e9b\u533a\u522b\u3002for\u548cforeach\u7684\u533a\u522b\u662f\uff1a1\u3001\u9002\u7528\u5bf9\u8c61<\/strong>\uff1b2\u3001\u5faa\u73af\u53d8\u91cf<\/strong>\uff1b3\u3001\u7d22\u5f15\u8bbf\u95ee<\/strong>\uff1b4\u3001\u904d\u5386\u65b9\u5f0f<\/strong>\u3002\u9002\u7528\u5bf9\u8c61\u662f\u6307\uff0cfor\u5faa\u73af\u9002\u7528\u4e8e\u4efb\u4f55\u9700\u8981\u91cd\u590d\u6267\u884c\u6307\u5b9a\u6b21\u6570\u7684\u60c5\u51b5\uff0c\u800cforeach\u5faa\u73af\u4e13\u95e8\u7528\u4e8e\u904d\u5386\u96c6\u5408\u7c7b\u578b\u7684\u6570\u636e\uff0c\u66f4\u52a0\u7b80\u6d01\u6613\u8bfb\u3002<\/p>\n<\/blockquote>\n\n\n

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\"\"<\/figure><\/div>\n\n\n

\u4e00\u3001for\u5faa\u73af<\/h2>\n\n\n\n

for\u5faa\u73af\u662f\u4e00\u79cd\u901a\u7528\u7684\u5faa\u73af\u7ed3\u6784\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u6307\u5b9a\u5faa\u73af\u7684\u8d77\u59cb\u6761\u4ef6\u3001\u7ed3\u675f\u6761\u4ef6\u548c\u6bcf\u6b21\u8fed\u4ee3\u540e\u7684\u64cd\u4f5c\u3002for\u5faa\u73af\u9002\u7528\u4e8e\u5faa\u73af\u6b21\u6570\u5df2\u77e5\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u3001\u5217\u8868\u3001\u5b57\u7b26\u4e32\u7b49\u6709\u5e8f\u96c6\u5408\u3002<\/p>\n\n\n\n

\u8bed\u6cd5\uff1a<\/strong><\/p>\n\n\n\n

for (\u521d\u59cb\u5316; \u6761\u4ef6; \u8fed\u4ee3) {\r\n    \/\/ \u5faa\u73af\u4f53\r\n}\r<\/code><\/pre>\n\n\n\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
for (int i = 0; i < 5; i++) {\r\n    System.out.println(i);\r\n}\r<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u5faa\u73af\u4ecei=0\u5f00\u59cb\uff0c\u6bcf\u6b21\u589e\u52a01\uff0c\u76f4\u5230i<5\u65f6\u505c\u6b62\u3002\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a0, 1, 2, 3, 4\u3002<\/p>\n\n\n\n
\u4e8c\u3001foreach\u5faa\u73af<\/h2>\n\n\n\n
foreach\u5faa\u73af\uff08\u4e5f\u79f0\u4e3a\u589e\u5f3a\u578bfor\u5faa\u73af\uff09\u662f\u4e00\u79cd\u7b80\u5316\u7684\u5faa\u73af\u7ed3\u6784\uff0c\u4e13\u95e8\u7528\u4e8e\u904d\u5386\u96c6\u5408\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5982\u6570\u7ec4\u3001\u5217\u8868\u3001\u96c6\u5408\u7b49\u3002\u5b83\u53ef\u4ee5\u9010\u4e2a\u8bbf\u95ee\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff0c\u65e0\u9700\u5173\u5fc3\u7d22\u5f15\u6216\u8fed\u4ee3\u5668\u3002<\/p>\n\n\n\n
\u8bed\u6cd5\uff1a<\/strong><\/p>\n\n\n\n
for (\u5143\u7d20\u7c7b\u578b \u53d8\u91cf\u540d : \u96c6\u5408) {\r\n    \/\/ \u5faa\u73af\u4f53\r\n}\r<\/code><\/pre>\n\n\n\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
int[] numbers = {1, 2, 3, 4, 5};\r\nfor (int num : numbers) {\r\n    System.out.println(num);\r\n}\r<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cforeach\u5faa\u73af\u904d\u5386\u6574\u578b\u6570\u7ec4numbers\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u6bcf\u4e2a\u5143\u7d20\u8d4b\u503c\u7ed9\u53d8\u91cfnum\uff0c\u7136\u540e\u6267\u884c\u5faa\u73af\u4f53\u3002\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a1, 2, 3, 4, 5\u3002<\/p>\n\n\n\n
\u4e09\u3001\u533a\u522b<\/h2>\n\n\n\n
    \n
  1. \u9002\u7528\u5bf9\u8c61\uff1a<\/strong> for\u5faa\u73af\u9002\u7528\u4e8e\u4efb\u4f55\u9700\u8981\u91cd\u590d\u6267\u884c\u6307\u5b9a\u6b21\u6570\u7684\u60c5\u51b5\uff0c\u800cforeach\u5faa\u73af\u4e13\u95e8\u7528\u4e8e\u904d\u5386\u96c6\u5408\u7c7b\u578b\u7684\u6570\u636e\uff0c\u66f4\u52a0\u7b80\u6d01\u6613\u8bfb\u3002<\/li>\n\n\n\n
  2. \u5faa\u73af\u53d8\u91cf\uff1a<\/strong> for\u5faa\u73af\u9700\u8981\u5728\u5916\u90e8\u663e\u5f0f\u58f0\u660e\u5faa\u73af\u53d8\u91cf\uff0c\u5e76\u5728\u5faa\u73af\u4f53\u5185\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\u3002\u800cforeach\u5faa\u73af\u5219\u4e0d\u9700\u8981\u663e\u5f0f\u58f0\u660e\u5faa\u73af\u53d8\u91cf\uff0c\u76f4\u63a5\u5c06\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8d4b\u503c\u7ed9\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\u3002<\/li>\n\n\n\n
  3. \u7d22\u5f15\u8bbf\u95ee\uff1a<\/strong> for\u5faa\u73af\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u6570\u7ec4\u6216\u5217\u8868\u4e2d\u7684\u5143\u7d20\uff0c\u56e0\u4e3a\u5faa\u73af\u53d8\u91cfi\u53ef\u4ee5\u4f5c\u4e3a\u7d22\u5f15\u3002\u800cforeach\u5faa\u73af\u53ea\u80fd\u9010\u4e2a\u8bbf\u95ee\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff0c\u4e0d\u80fd\u76f4\u63a5\u83b7\u53d6\u7d22\u5f15\u3002<\/li>\n\n\n\n
  4. \u904d\u5386\u65b9\u5f0f\uff1a<\/strong> for\u5faa\u73af\u53ef\u4ee5\u6839\u636e\u9700\u8981\u81ea\u7531\u8bbe\u7f6e\u5faa\u73af\u6761\u4ef6\u548c\u8fed\u4ee3\u6b65\u957f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5012\u5e8f\u904d\u5386\u7b49\u590d\u6742\u904d\u5386\u65b9\u5f0f\u3002\u800cforeach\u5faa\u73af\u53ea\u80fd\u987a\u5e8f\u904d\u5386\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u3002<\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n
    \u5ef6\u4f38\u9605\u8bfb<\/h2>\n\n\n\n
    Python\u4e2d\u7684for\u548cwhile\u5faa\u73af<\/strong><\/p>\n\n\n\n
    \u5728Python\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u6ca1\u6709\u7c7b\u4f3c\u4e8eJava\u4e2d\u7684for\u5faa\u73af\u548cforeach\u5faa\u73af\u3002Python\u4e2d\u7684for\u5faa\u73af\u66f4\u7c7b\u4f3c\u4e8eJava\u4e2d\u7684foreach\u5faa\u73af\uff0c\u7528\u4e8e\u904d\u5386\u96c6\u5408\u7c7b\u578b\u7684\u6570\u636e\u3002\u800c\u8981\u5b9e\u73b0\u7c7b\u4f3c\u4e8eJava\u4e2d\u7684for\u5faa\u73af\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684range()\u51fd\u6570\u7ed3\u5408for\u5faa\u73af\u6765\u5b9e\u73b0\u3002\u6b64\u5916\uff0cPython\u8fd8\u6709while\u5faa\u73af\u7528\u4e8e\u5728\u6ee1\u8db3\u6761\u4ef6\u65f6\u91cd\u590d\u6267\u884c\u4ee3\u7801\u5757\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728\u8bb8\u591a\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0cfor\u548cforeach\u90fd\u662f\u7528\u4e8e\u5faa\u73af\u7684\u5173\u952e\u5b57\uff0c\u4f46\u5b83\u4eec\u5728\u4f7f\u7528\u548c\u529f\u80fd\u4e0a\u6709\u4e00\u4e9b\u533a\u522b\u3002for\u548cfore […]","protected":false},"author":6,"featured_media":46608,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/46607"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=46607"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/46607\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/46608"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=46607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=46607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=46607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}