{"id":65722,"date":"2025-05-03T11:46:13","date_gmt":"2025-05-03T03:46:13","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65722\/"},"modified":"2025-05-03T11:46:13","modified_gmt":"2025-05-03T03:46:13","slug":"java%e6%95%b0%e7%bb%84%e4%b8%ad%e6%80%8e%e4%b9%88%e7%bb%9f%e8%ae%a1%e4%b8%aa%e6%95%b0-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65722\/","title":{"rendered":"java\u6570\u7ec4\u4e2d\u600e\u4e48\u7edf\u8ba1\u4e2a\u6570"},"content":{"rendered":"<blockquote><p>\n  java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u5143\u7d20\u4e2a\u6570\u53ef\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u5b9e\u73b0\uff1a\u5faa\u73af\u904d\u5386\u6570\u7ec4\uff0c\u82e5\u5143\u7d20\u7b49\u4e8e\u76ee\u6807\uff0c\u5219\u8ba1\u6570\u5668\u52a01\u3002\u4f7f\u7528arrays.stream()\u548cfilter()\u65b9\u6cd5\u521b\u5efa\u5143\u7d20\u6d41\uff0c\u8fc7\u6ee4\u51fa\u76ee\u6807\u5143\u7d20\u5e76\u7edf\u8ba1\u4e2a\u6570\u3002\u540e\u8005\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u66f4\u6709\u6548\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111308124220440.jpg\" class=\"aligncenter\" title=\"java\u6570\u7ec4\u4e2d\u600e\u4e48\u7edf\u8ba1\u4e2a\u6570\u63d2\u56fe\" alt=\"java\u6570\u7ec4\u4e2d\u600e\u4e48\u7edf\u8ba1\u4e2a\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>Java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u5143\u7d20\u4e2a\u6570<\/strong><\/p>\n<p>\u5728Java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u7279\u5b9a\u5143\u7d20\u7684\u4e2a\u6570\u662f\u4e00\u79cd\u5e38\u89c1\u4efb\u52a1\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u57fa\u672c\u5faa\u73af\u65b9\u6cd5\u6216\u5229\u7528\u5185\u7f6e\u51fd\u6570\u6765\u5b9e\u73b0\u3002<\/p>\n<p><strong>\u5faa\u73af\u65b9\u6cd5<\/strong><\/p>\n<ul>\n<li>\u904d\u5386\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20<\/li>\n<li>\u5982\u679c\u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u76ee\u6807\u5143\u7d20\uff0c\u5219\u5c06\u8ba1\u6570\u5668\u53d8\u91cf\u52a01<\/li>\n<li>\u8be5\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u6613\u4e8e\u7406\u89e3\u548c\u5b9e\u73b0\uff0c\u4f46\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u6765\u8bf4\u6548\u7387\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public static int countElement(int[] arr, int target) {\n    int count = 0;\n    for (int i = 0; i &lt; arr.length; i++) {\n        if (arr[i] == target) {\n            count++;\n        }\n    }\n    return count;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5<\/strong><\/p>\n<ul>\n<li>Java\u63d0\u4f9b\u4e86Arrays.stream()\u548cfilter()\u65b9\u6cd5\u6765\u7b80\u5316\u5143\u7d20\u8ba1\u6570<\/li>\n<li>\u4f7f\u7528Arrays.stream()\u521b\u5efa\u5143\u7d20\u6d41<\/li>\n<li>\u4f7f\u7528filter()\u8fc7\u6ee4\u51fa\u7b49\u4e8e\u76ee\u6807\u5143\u7d20\u7684\u5143\u7d20<\/li>\n<li>\u4f7f\u7528count()\u65b9\u6cd5\u7edf\u8ba1\u8fc7\u6ee4\u540e\u7684\u5143\u7d20\u4e2a\u6570<\/li>\n<li>\u8be5\u65b9\u6cd5\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u975e\u5e38\u6709\u6548\uff0c\u56e0\u4e3a\u5b83\u662f\u60f0\u6027\u6c42\u503c\u7684\uff0c\u4ec5\u5728\u9700\u8981\u65f6\u624d\u904d\u5386\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public static int countElement(int[] arr, int target) {\n    return (int) Arrays.stream(arr).filter(x -&gt; x == target).count();\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u54ea\u4e2a\u65b9\u6cd5\u66f4\u4f18\uff1f<\/strong><\/p>\n<p>\u5bf9\u4e8e\u5c0f\u578b\u6570\u7ec4\uff0c\u5faa\u73af\u65b9\u6cd5\u8db3\u591f\u9ad8\u6548\u3002\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\uff08\u8d85\u8fc710\u4e07\u4e2a\u5143\u7d20\uff09\uff0c\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5\u660e\u663e\u66f4\u5feb\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u4e2d\u600e\u4e48\u7edf\u8ba1\u4e2a\u6570\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u5143\u7d20\u4e2a\u6570\u53ef\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u5b9e\u73b0\uff1a\u5faa\u73af\u904d\u5386\u6570\u7ec4\uff0c\u82e5\u5143\u7d20\u7b49\u4e8e\u76ee\u6807\uff0c\u5219\u8ba1\u6570\u5668\u52a01\u3002\u4f7f\u7528arrays.stream()\u548cfilter()\u65b9\u6cd5\u521b\u5efa\u5143\u7d20\u6d41\uff0c\u8fc7\u6ee4\u51fa\u76ee\u6807\u5143\u7d20\u5e76\u7edf\u8ba1\u4e2a\u6570\u3002\u540e\u8005\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u66f4\u6709\u6548\u3002 Java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u5143\u7d20\u4e2a\u6570 \u5728Java\u6570\u7ec4\u4e2d\u7edf\u8ba1\u7279\u5b9a\u5143\u7d20\u7684\u4e2a\u6570\u662f\u4e00\u79cd\u5e38\u89c1\u4efb\u52a1\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u57fa\u672c\u5faa\u73af\u65b9\u6cd5\u6216\u5229\u7528\u5185\u7f6e\u51fd\u6570\u6765\u5b9e\u73b0\u3002 \u5faa\u73af\u65b9\u6cd5 \u904d\u5386\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20 \u5982\u679c\u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u76ee\u6807\u5143\u7d20\uff0c\u5219\u5c06\u8ba1\u6570\u5668\u53d8\u91cf\u52a01 \u8be5\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u6613\u4e8e\u7406\u89e3\u548c\u5b9e\u73b0\uff0c\u4f46\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u6765\u8bf4\u6548\u7387\u8f83\u4f4e\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public static int countElement(int[] arr, int target) { int count = 0; for (int i = 0; i &lt; arr.length; i++) { if (arr[i] == target) { count++; } } return count; } \u767b\u5f55\u540e\u590d\u5236 \u5185\u7f6e\u51fd\u6570\u65b9\u6cd5 Java\u63d0\u4f9b\u4e86Arrays.stream()\u548cfilter()\u65b9\u6cd5\u6765\u7b80\u5316\u5143\u7d20\u8ba1\u6570 \u4f7f\u7528Arrays.stream()\u521b\u5efa\u5143\u7d20\u6d41 \u4f7f\u7528filter()\u8fc7\u6ee4\u51fa\u7b49\u4e8e\u76ee\u6807\u5143\u7d20\u7684\u5143\u7d20 \u4f7f\u7528count()\u65b9\u6cd5\u7edf\u8ba1\u8fc7\u6ee4\u540e\u7684\u5143\u7d20\u4e2a\u6570 \u8be5\u65b9\u6cd5\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\u975e\u5e38\u6709\u6548\uff0c\u56e0\u4e3a\u5b83\u662f\u60f0\u6027\u6c42\u503c\u7684\uff0c\u4ec5\u5728\u9700\u8981\u65f6\u624d\u904d\u5386\u6570\u7ec4\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public static int countElement(int[] [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-65722","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65722","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=65722"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65722\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}