{"id":34988,"date":"2024-11-26T11:16:12","date_gmt":"2024-11-26T03:16:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/34988\/"},"modified":"2024-11-26T11:16:12","modified_gmt":"2024-11-26T03:16:12","slug":"java%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e5%85%83%e7%b4%a0%e6%98%af%e5%90%a6%e5%9c%a8%e6%95%b0%e7%bb%84%e9%87%8c%e9%9d%a2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/34988\/","title":{"rendered":"java\u600e\u4e48\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u91cc\u9762"},"content":{"rendered":"<blockquote><p>\n  java \u4e2d\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 arrays.binarysearch() \u65b9\u6cd5\uff0c\u53ef\u9ad8\u6548\u67e5\u627e\u5143\u7d20\u5728\u6392\u5e8f\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15\u3002\u4f7f\u7528\u7ebf\u6027\u641c\u7d22\u9010\u4e2a\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u76f4\u81f3\u627e\u5230\u76ee\u6807\u5143\u7d20\u6216\u8fbe\u5230\u5217\u8868\u672b\u5c3e\u3002\u4f7f\u7528 for-each \u5faa\u73af\u548c contains() \u65b9\u6cd5\u7b80\u6d01\u5730\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/03\/2024110307394977624.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u91cc\u9762\u63d2\u56fe\" alt=\"java\u600e\u4e48\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u91cc\u9762\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u4e2d\u5982\u4f55\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d<\/strong><\/p>\n<p>\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u662f\u7f16\u5199 Java \u4ee3\u7801\u65f6\u7ecf\u5e38\u51fa\u73b0\u7684\u4e00\u4e2a\u4efb\u52a1\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/p>\n<p><strong>\u4f7f\u7528 Arrays.binarySearch()<\/strong><\/p>\n<p>Arrays.binarySearch() \u65b9\u6cd5\u53ef\u7528\u4e8e\u5728\u6392\u5e8f\u597d\u7684\u6570\u7ec4\u4e2d\u9ad8\u6548\u5730\u67e5\u627e\u5143\u7d20\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15\uff0c\u5982\u679c\u672a\u627e\u5230\u5143\u7d20\uff0c\u5219\u8fd4\u56de\u8d1f\u503c\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>int[] arr = {1, 3, 5, 7, 9};\nint target = 5;\n\nint index = Arrays.binarySearch(arr, target);\nif (index &gt;= 0) {\n    System.out.println(\"\u5143\u7d20\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\uff0c\u7d22\u5f15\u4e3a\uff1a\" + index);\n} else {\n    System.out.println(\"\u5143\u7d20\u672a\u5728\u6570\u7ec4\u4e2d\u627e\u5230\u3002\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u7ebf\u6027\u641c\u7d22<\/strong><\/p>\n<p>\u7ebf\u6027\u641c\u7d22\u662f\u4e00\u79cd\u9010\u4e2a\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u7684\u65b9\u6cd5\uff0c\u76f4\u5230\u627e\u5230\u76ee\u6807\u5143\u7d20\u6216\u8fbe\u5230\u5217\u8868\u672b\u5c3e\u3002<\/p>\n<pre>int[] arr = {1, 3, 5, 7, 9};\nint target = 5;\n\nfor (int i = 0; i &lt; arr.length; i++) {\n    if (arr[i] == target) {\n        System.out.println(\"\u5143\u7d20\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\uff0c\u7d22\u5f15\u4e3a\uff1a\" + i);\n        break;\n    }\n}\n\nif (i == arr.length) {\n    System.out.println(\"\u5143\u7d20\u672a\u5728\u6570\u7ec4\u4e2d\u627e\u5230\u3002\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 for-each \u5faa\u73af\u548c contns() \u65b9\u6cd5<\/strong><\/p>\n<p>Java 8 \u5f15\u5165\u4e86 for-each \u5faa\u73af\u548c contains() \u65b9\u6cd5\uff0c\u5b83\u4eec\u53ef\u4ee5\u7528\u4e8e\u7b80\u6d01\u5730\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u3002<\/p>\n<pre>int[] arr = {1, 3, 5, 7, 9};\nint target = 5;\n\nif (Arrays.asList(arr).contains(target)) {\n    System.out.println(\"\u5143\u7d20\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u3002\");\n} else {\n    System.out.println(\"\u5143\u7d20\u672a\u5728\u6570\u7ec4\u4e2d\u627e\u5230\u3002\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u6839\u636e\u5177\u4f53\u7684\u60c5\u51b5\u548c\u6027\u80fd\u8981\u6c42\uff0c\u53ef\u4ee5\u9009\u62e9\u6700\u5408\u9002\u7684\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u91cc\u9762\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u4e2d\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 arrays.binarysearch() \u65b9\u6cd5\uff0c\u53ef\u9ad8\u6548\u67e5\u627e\u5143\u7d20\u5728\u6392\u5e8f\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15\u3002\u4f7f\u7528\u7ebf\u6027\u641c\u7d22\u9010\u4e2a\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u76f4\u81f3\u627e\u5230\u76ee\u6807\u5143\u7d20\u6216\u8fbe\u5230\u5217\u8868\u672b\u5c3e\u3002\u4f7f\u7528 for-each \u5faa\u73af\u548c contains() \u65b9\u6cd5\u7b80\u6d01\u5730\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u3002 Java \u4e2d\u5982\u4f55\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d \u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u6570\u7ec4\u4e2d\u662f\u7f16\u5199 Java \u4ee3\u7801\u65f6\u7ecf\u5e38\u51fa\u73b0\u7684\u4e00\u4e2a\u4efb\u52a1\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002 \u4f7f\u7528 Arrays.binarySearch() Arrays.binarySearch() \u65b9\u6cd5\u53ef\u7528\u4e8e\u5728\u6392\u5e8f\u597d\u7684\u6570\u7ec4\u4e2d\u9ad8\u6548\u5730\u67e5\u627e\u5143\u7d20\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15\uff0c\u5982\u679c\u672a\u627e\u5230\u5143\u7d20\uff0c\u5219\u8fd4\u56de\u8d1f\u503c\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] arr = {1, 3, 5, 7, 9}; int target = 5; int index = Arrays.binarySearch(arr, target); if (index &gt;= 0) { System.out.println(&#8220;\u5143\u7d20\u5b58\u5728\u4e8e\u6570\u7ec4\u4e2d\uff0c\u7d22\u5f15\u4e3a\uff1a&#8221; + index); } else { System.out.println(&#8220;\u5143\u7d20\u672a\u5728\u6570\u7ec4\u4e2d\u627e\u5230\u3002&#8221;); } \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u7ebf\u6027\u641c\u7d22 \u7ebf\u6027\u641c\u7d22\u662f\u4e00\u79cd\u9010\u4e2a\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u7684\u65b9\u6cd5\uff0c\u76f4\u5230\u627e\u5230\u76ee\u6807\u5143\u7d20\u6216\u8fbe\u5230\u5217\u8868\u672b\u5c3e\u3002 int[] arr = {1, [&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-34988","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34988","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=34988"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34988\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=34988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=34988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=34988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}