{"id":65504,"date":"2025-05-03T14:48:11","date_gmt":"2025-05-03T06:48:11","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65504\/"},"modified":"2025-05-03T14:48:11","modified_gmt":"2025-05-03T06:48:11","slug":"java%e7%bc%96%e7%a8%8b%e6%95%b0%e7%bb%84%e9%87%8d%e5%a4%8d%e6%80%8e%e4%b9%88%e5%88%a0%e9%99%a4-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65504\/","title":{"rendered":"java\u7f16\u7a0b\u6570\u7ec4\u91cd\u590d\u600e\u4e48\u5220\u9664"},"content":{"rendered":"

\n \u4ece java \u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528 set \u8f6c\u6362\u6570\u7ec4\u5143\u7d20\uff0c\u53bb\u9664\u91cd\u590d\u5143\u7d20\u3002\u4f7f\u7528 map \u7edf\u8ba1\u5143\u7d20\u51fa\u73b0\u9891\u7387\uff0c\u4fdd\u7559\u51fa\u73b0\u9891\u7387\u4e3a 1 \u7684\u5143\u7d20\u3002\u4f7f\u7528 stringbuilder \u6309\u987a\u5e8f\u5b58\u50a8\u5143\u7d20\uff0c\u540c\u65f6\u8ddf\u8e2a\u5df2\u5b58\u5728\u7684\u5143\u7d20\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff0c\u5982 apache commons collections\u3001guava \u6216 fastutil\uff0c\u63d0\u4f9b\u4e13\u95e8\u7684\u53bb\u91cd\u65b9\u6cd5\u3002\n<\/p><\/blockquote>\n

\"java\u7f16\u7a0b\u6570\u7ec4\u91cd\u590d\u600e\u4e48\u5220\u9664\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u4ece Java \u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u6570\u7ec4\u5143\u7d20\u7684\u552f\u4e00\u6027\u81f3\u5173\u91cd\u8981\u3002\u91cd\u590d\u5143\u7d20\u7684\u5b58\u5728\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u548c\u4e0d\u4e00\u81f4\u7684\u7ed3\u679c\u3002\u56e0\u6b64\uff0c\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002<\/p>\n

\u65b9\u6cd5 1\uff1a\u4f7f\u7528 Set<\/strong><\/p>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a Set\u3002Set \u662f\u4e00\u79cd\u96c6\u5408\u6570\u636e\u7ed3\u6784\uff0c\u5176\u4e2d\u4e0d\u5141\u8bb8\u51fa\u73b0\u91cd\u590d\u5143\u7d20\u3002<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

int[] arr = {1, 2, 3, 3, 4, 5, 5, 6, 7};\nSet<Integer> set = new HashSet<>(Arrays.asList(arr));\nint[] uniqueArr = set.toArray(new Integer[0]);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 2\uff1a\u4f7f\u7528 Map<\/strong><\/p>\n
\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 Map\uff0c\u5176\u4e2d\u952e\u662f\u6570\u7ec4\u5143\u7d20\uff0c\u503c\u4e3a\u5143\u7d20\u51fa\u73b0\u7684\u9891\u7387\u3002\u7136\u540e\uff0c\u901a\u8fc7\u904d\u5386 Map \u5e76\u4ec5\u4fdd\u7559\u51fa\u73b0\u9891\u7387\u4e3a 1 \u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u83b7\u5f97\u552f\u4e00\u5143\u7d20\u3002<\/p>\n
int[] arr = {1, 2, 3, 3, 4, 5, 5, 6, 7};\nMap<Integer, Integer> map = new HashMap<>();\nfor (int num : arr) {\n    map.put(num, map.getOrDefault(num, 0) + 1);\n}\n\nList<Integer> uniqueList = new ArrayList<>();\nfor (Map.Entry<Integer, Integer> entry : map.entrySet()) {\n    if (entry.getValue() == 1) {\n        uniqueList.add(entry.getKey());\n    }\n}\n\nint[] uniqueArr = new int[uniqueList.size()];\nfor (int i = 0; i < uniqueList.size(); i++) {\n    uniqueArr[i] = uniqueList.get(i);\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 3\uff1a\u4f7f\u7528 StringBuilder<\/strong><\/p>\n
\u5bf9\u4e8e\u5927\u578b\u6570\u7ec4\uff0cStringBuilder \u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u6709\u6548\u7684\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u6309\u987a\u5e8f\u5b58\u50a8\u6570\u7ec4\u5143\u7d20\uff0c\u540c\u65f6\u8ddf\u8e2a\u5df2\u7ecf\u5b58\u5728\u7684\u5143\u7d20\u3002<\/p>\n
int[] arr = {1, 2, 3, 3, 4, 5, 5, 6, 7};\nStringBuilder sb = new StringBuilder();\nfor (int num : arr) {\n    if (sb.indexOf(String.valueOf(num)) == -1) {\n        sb.append(num).append(\",\");\n    }\n}\nString uniqueStr = sb.toString();\nuniqueStr = uniqueStr.substring(0, uniqueStr.length() - 1);\nint[] uniqueArr = Arrays.stream(uniqueStr.split(\",\")).mapToInt(Integer::parseInt).toArray();<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 4\uff1a\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93<\/strong><\/p>\n
\u8fd8\u6709\u4e00\u4e9b\u7b2c\u4e09\u65b9\u5e93\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879\uff0c\u4f8b\u5982 Apache Commons Collections\u3001Guava \u548c FastUtil\u3002\u8fd9\u4e9b\u5e93\u63d0\u4f9b\u4e86\u4e13\u95e8\u7528\u4e8e\u6b64\u76ee\u7684\u7684\u65b9\u6cd5\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662fjava\u7f16\u7a0b\u6570\u7ec4\u91cd\u590d\u600e\u4e48\u5220\u9664\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4ece java \u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528 set \u8f6c\u6362\u6570\u7ec4\u5143\u7d20\uff0c\u53bb\u9664\u91cd\u590d\u5143\u7d20\u3002\u4f7f\u7528 map \u7edf\u8ba1\u5143\u7d20\u51fa\u73b0\u9891\u7387\uff0c\u4fdd\u7559\u51fa\u73b0\u9891\u7387\u4e3a 1 \u7684\u5143\u7d20\u3002\u4f7f\u7528 stringbuilder \u6309\u987a\u5e8f\u5b58\u50a8\u5143\u7d20\uff0c\u540c\u65f6\u8ddf\u8e2a\u5df2\u5b58\u5728\u7684\u5143\u7d20\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff0c\u5982 apache commons collections\u3001guava \u6216 fastutil\uff0c\u63d0\u4f9b\u4e13\u95e8\u7684\u53bb\u91cd\u65b9\u6cd5\u3002 \u5982\u4f55\u4ece Java \u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879 \u5728 Java \u4e2d\uff0c\u6570\u7ec4\u5143\u7d20\u7684\u552f\u4e00\u6027\u81f3\u5173\u91cd\u8981\u3002\u91cd\u590d\u5143\u7d20\u7684\u5b58\u5728\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u548c\u4e0d\u4e00\u81f4\u7684\u7ed3\u679c\u3002\u56e0\u6b64\uff0c\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u91cd\u590d\u9879\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002 \u65b9\u6cd5 1\uff1a\u4f7f\u7528 Set \u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a Set\u3002Set \u662f\u4e00\u79cd\u96c6\u5408\u6570\u636e\u7ed3\u6784\uff0c\u5176\u4e2d\u4e0d\u5141\u8bb8\u51fa\u73b0\u91cd\u590d\u5143\u7d20\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] arr = {1, 2, 3, 3, 4, 5, 5, 6, 7}; Set<Integer> set = new HashSet<>(Arrays.asList(arr)); int[] uniqueArr = set.toArray(new Integer[0]); \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5 2\uff1a\u4f7f\u7528 Map […]<\/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-65504","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65504","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=65504"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65504\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}