{"id":66429,"date":"2025-05-03T17:12:05","date_gmt":"2025-05-03T09:12:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66429\/"},"modified":"2025-05-03T17:12:05","modified_gmt":"2025-05-03T09:12:05","slug":"java%e4%b8%ad%e6%80%8e%e4%b9%88%e5%8e%bb%e9%99%a4%e6%95%b0%e7%bb%84%e4%b8%ad%e9%87%8d%e5%a4%8d-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66429\/","title":{"rendered":"java\u4e2d\u600e\u4e48\u53bb\u9664\u6570\u7ec4\u4e2d\u91cd\u590d"},"content":{"rendered":"<blockquote><p>\n  \u5e38\u7528\u7684\u65b9\u6cd5\u4e3a\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u6bcf\u4e2a\u552f\u4e00\u5143\u7d20\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n^2)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002\u4f7f\u7528 set \u63a5\u53e3\uff0c\u5c06\u539f\u6570\u7ec4\u5143\u7d20\u6dfb\u52a0\u5230 set \u4e2d\uff0c\u4ece set \u4e2d\u68c0\u7d22\u5143\u7d20\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111603282254627.jpg\" class=\"aligncenter\" title=\"java\u4e2d\u600e\u4e48\u53bb\u9664\u6570\u7ec4\u4e2d\u91cd\u590d\u63d2\u56fe\" alt=\"java\u4e2d\u600e\u4e48\u53bb\u9664\u6570\u7ec4\u4e2d\u91cd\u590d\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u53bb\u9664 Java \u4e2d\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u9879<\/strong><\/p>\n<p><strong>\u56de\u7b54\uff1a<\/strong><\/p>\n<p>\u53bb\u9664 Java \u6570\u7ec4\u4e2d\u91cd\u590d\u9879\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u521b\u5efa\u65b0\u6570\u7ec4\u6216\u4f7f\u7528 Set\u3002<\/p>\n<p><strong>\u8be6\u7ec6\u8bf4\u660e\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p><strong>1. \u521b\u5efa\u65b0\u6570\u7ec4<\/strong><\/p>\n<ul>\n<li>\u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u6bcf\u4e2a\u552f\u4e00\u5143\u7d20\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\u3002<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n^2)\uff0c\u5176\u4e2d n \u662f\u539f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u521b\u5efa\u65b0\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<p><strong>2. \u4f7f\u7528 Set<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528 Set \u63a5\u53e3\uff0c\u5b83\u4e0d\u5b58\u50a8\u91cd\u590d\u7684\u5143\u7d20\u3002<\/li>\n<li>\u5c06\u539f\u6570\u7ec4\u5143\u7d20\u6dfb\u52a0\u5230 Set \u4e2d\u3002<\/li>\n<li>\u4ece Set \u4e2d\u68c0\u7d22\u5143\u7d20\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\u3002<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a Set \u64cd\u4f5c\u7684\u590d\u6742\u5ea6\u901a\u5e38\u662f O(1)\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u521b\u5efa Set \u548c\u65b0\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><strong>\u521b\u5efa\u65b0\u6570\u7ec4\uff1a<\/strong><\/p>\n<pre>int[] originalArray = {1, 2, 3, 4, 4, 5};\n\n\/\/ \u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u4e0d\u5305\u542b\u91cd\u590d\u9879\nint[] newArray = new int[originalArray.length];\nint uniqueIndex = 0;\n\nfor (int i = 0; i &lt; originalArray.length; i++) {\n    boolean unique = true;\n\n    \/\/ \u68c0\u67e5\u5f53\u524d\u5143\u7d20\u662f\u5426\u5df2\u5b58\u5728\u4e8e\u65b0\u6570\u7ec4\u4e2d\n    for (int j = 0; j &lt; uniqueIndex; j++) {\n        if (originalArray[i] == newArray[j]) {\n            unique = false;\n            break;\n        }\n    }\n\n    \/\/ \u5982\u679c\u5143\u7d20\u662f\u552f\u4e00\u7684\uff0c\u5219\u5c06\u5176\u6dfb\u52a0\u5230\u65b0\u6570\u7ec4\u4e2d\n    if (unique) {\n        newArray[uniqueIndex] = originalArray[i];\n        uniqueIndex++;\n    }\n}\n\n\/\/ \u8c03\u6574\u65b0\u6570\u7ec4\u7684\u5927\u5c0f\nnewArray = Arrays.copyOf(newArray, uniqueIndex);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 Set\uff1a<\/strong><\/p>\n<pre>int[] originalArray = {1, 2, 3, 4, 4, 5};\n\n\/\/ \u521b\u5efa Set\uff0c\u4e0d\u5305\u542b\u91cd\u590d\u9879\nSet&lt;Integer&gt; uniqueSet = new HashSet&lt;&gt;();\n\n\/\/ \u5c06\u539f\u6570\u7ec4\u5143\u7d20\u6dfb\u52a0\u5230 Set \u4e2d\nfor (int num : originalArray) {\n    uniqueSet.add(num);\n}\n\n\/\/ \u4ece Set \u4e2d\u68c0\u7d22\u5143\u7d20\u5e76\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\nint[] newArray = new int[uniqueSet.size()];\nint index = 0;\n\nfor (int num : uniqueSet) {\n    newArray[index++] = num;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u4e2d\u600e\u4e48\u53bb\u9664\u6570\u7ec4\u4e2d\u91cd\u590d\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>\u5e38\u7528\u7684\u65b9\u6cd5\u4e3a\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u6bcf\u4e2a\u552f\u4e00\u5143\u7d20\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n^2)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002\u4f7f\u7528 set \u63a5\u53e3\uff0c\u5c06\u539f\u6570\u7ec4\u5143\u7d20\u6dfb\u52a0\u5230 set \u4e2d\uff0c\u4ece set \u4e2d\u68c0\u7d22\u5143\u7d20\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\u3002 \u5982\u4f55\u53bb\u9664 Java \u4e2d\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u9879 \u56de\u7b54\uff1a \u53bb\u9664 Java \u6570\u7ec4\u4e2d\u91cd\u590d\u9879\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u521b\u5efa\u65b0\u6570\u7ec4\u6216\u4f7f\u7528 Set\u3002 \u8be6\u7ec6\u8bf4\u660e\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b 1. \u521b\u5efa\u65b0\u6570\u7ec4 \u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u6bcf\u4e2a\u552f\u4e00\u5143\u7d20\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\u3002 \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n^2)\uff0c\u5176\u4e2d n \u662f\u539f\u6570\u7ec4\u7684\u957f\u5ea6\u3002 \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u521b\u5efa\u65b0\u6570\u7ec4\u3002 2. \u4f7f\u7528 Set \u4f7f\u7528 Set \u63a5\u53e3\uff0c\u5b83\u4e0d\u5b58\u50a8\u91cd\u590d\u7684\u5143\u7d20\u3002 \u5c06\u539f\u6570\u7ec4\u5143\u7d20\u6dfb\u52a0\u5230 Set \u4e2d\u3002 \u4ece Set \u4e2d\u68c0\u7d22\u5143\u7d20\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u65b0\u6570\u7ec4\u4e2d\u3002 \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a Set \u64cd\u4f5c\u7684\u590d\u6742\u5ea6\u901a\u5e38\u662f O(1)\u3002 \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n)\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u521b\u5efa Set \u548c\u65b0\u6570\u7ec4\u3002 \u793a\u4f8b\uff1a \u521b\u5efa\u65b0\u6570\u7ec4\uff1a int[] originalArray = {1, 2, 3, [&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-66429","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66429","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=66429"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66429\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=66429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=66429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=66429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}