{"id":66691,"date":"2025-05-03T17:57:49","date_gmt":"2025-05-03T09:57:49","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66691\/"},"modified":"2025-05-03T17:57:49","modified_gmt":"2025-05-03T09:57:49","slug":"java%e6%80%8e%e4%b9%88%e5%9c%a8%e6%95%b0%e7%bb%84%e9%87%8d%e5%a4%8d%e5%a4%9a%e5%b0%91%e4%b8%aa-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66691\/","title":{"rendered":"java\u600e\u4e48\u5728\u6570\u7ec4\u91cd\u590d\u591a\u5c11\u4e2a"},"content":{"rendered":"

\n \u5728 java \u4e2d\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e09\u79cd\u65b9\u6cd5\uff1a1. arrays.frequency() \u65b9\u6cd5\uff1b2. \u54c8\u5e0c\u8868\uff1b3. \u5faa\u73af\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u5728\u6570\u7ec4\u91cd\u590d\u591a\u5c11\u4e2a\u63d2\u56fe\"<\/p>\n

\u5728 Java \u4e2d\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u6765\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1a<\/p>\n

1. \u4f7f\u7528 Arrays.frequency() \u65b9\u6cd5<\/strong><\/p>\n

Arrays.frequency() \u65b9\u6cd5\u53ef\u4ee5\u8ba1\u7b97\u6570\u7ec4\u4e2d\u6307\u5b9a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

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

public static int frequency(int[] arr, int element)<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • arr\uff1a\u8981\u67e5\u627e\u7684\u6570\u7ec4<\/li>\n
  • element\uff1a\u8981\u67e5\u627e\u7684\u5143\u7d20<\/li>\n<\/ul>\n
    2. \u4f7f\u7528\u54c8\u5e0c\u8868<\/strong><\/p>\n
    \u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5feb\u901f\u67e5\u627e\u548c\u68c0\u7d22\u5143\u7d20\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u54c8\u5e0c\u8868\u6765\u5b58\u50a8\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u548c\u5b83\u4eec\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528\u54c8\u5e0c\u8868\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1a<\/p>\n
    import java.util.HashMap;\n\n\/\/ \u521b\u5efa\u4e00\u4e2a HashMap \u6765\u5b58\u50a8\u5143\u7d20\u548c\u5b83\u4eec\u7684\u51fa\u73b0\u6b21\u6570\nHashMap<Integer, Integer> counts = new HashMap<>();\n\n\/\/ \u904d\u5386\u6570\u7ec4\uff0c\u5e76\u66f4\u65b0\u54c8\u5e0c\u8868\u4e2d\u7684\u8ba1\u6570\nfor (int element : arr) {\n    counts.put(element, counts.getOrDefault(element, 0) + 1);\n}\n\n\/\/ \u6839\u636e\u9700\u8981\u83b7\u53d6\u7279\u5b9a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\nint count = counts.get(element);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    3. \u4f7f\u7528\u5faa\u73af<\/strong><\/p>\n
    \u5982\u679c\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u8f83\u5c11\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u6765\u67e5\u627e\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528\u5faa\u73af\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1a<\/p>\n
    int count = 0;\n\n\/\/ \u904d\u5386\u6570\u7ec4\nfor (int element : arr) {\n    \/\/ \u5982\u679c\u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u8981\u67e5\u627e\u7684\u5143\u7d20\uff0c\u5219\u589e\u52a0\u8ba1\u6570\n    if (element == element) {\n        count++;\n    }\n}<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u6839\u636e\u4f60\u7684\u9700\u8981\uff0c\u53ef\u4ee5\u9009\u62e9\u6700\u9002\u5408\u4f60\u7684\u65b9\u6cd5\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5728\u6570\u7ec4\u91cd\u590d\u591a\u5c11\u4e2a\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728 java \u4e2d\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e09\u79cd\u65b9\u6cd5\uff1a1. arrays.frequency() \u65b9\u6cd5\uff1b2. \u54c8\u5e0c\u8868\uff1b3. \u5faa\u73af\u3002 \u5728 Java \u4e2d\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570 \u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u6765\u67e5\u627e\u6570\u7ec4\u4e2d\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1a 1. \u4f7f\u7528 Arrays.frequency() \u65b9\u6cd5 Arrays.frequency() \u65b9\u6cd5\u53ef\u4ee5\u8ba1\u7b97\u6570\u7ec4\u4e2d\u6307\u5b9a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public static int frequency(int[] arr, int element) \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a arr\uff1a\u8981\u67e5\u627e\u7684\u6570\u7ec4 element\uff1a\u8981\u67e5\u627e\u7684\u5143\u7d20 2. \u4f7f\u7528\u54c8\u5e0c\u8868 \u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5feb\u901f\u67e5\u627e\u548c\u68c0\u7d22\u5143\u7d20\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u54c8\u5e0c\u8868\u6765\u5b58\u50a8\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u548c\u5b83\u4eec\u51fa\u73b0\u7684\u6b21\u6570\u3002 \u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528\u54c8\u5e0c\u8868\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1a import java.util.HashMap; \/\/ \u521b\u5efa\u4e00\u4e2a HashMap \u6765\u5b58\u50a8\u5143\u7d20\u548c\u5b83\u4eec\u7684\u51fa\u73b0\u6b21\u6570 HashMap<Integer, Integer> counts = new HashMap<>(); \/\/ \u904d\u5386\u6570\u7ec4\uff0c\u5e76\u66f4\u65b0\u54c8\u5e0c\u8868\u4e2d\u7684\u8ba1\u6570 for (int element : arr) { […]<\/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-66691","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66691","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=66691"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66691\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=66691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=66691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=66691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}