{"id":203090,"date":"2025-05-22T09:35:02","date_gmt":"2025-05-22T01:35:02","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203090\/"},"modified":"2025-05-22T09:35:02","modified_gmt":"2025-05-22T01:35:02","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%b8%ad%e9%ab%98%e9%98%b6%e5%87%bd%e6%95%b0%e7%9a%84%e4%bc%98%e5%8a%bf%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203090\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf\u6709\u54ea\u4e9b\uff1f<\/h1>\n

\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u6587\u7ae0<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf\u6709\u54ea\u4e9b\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

Java \u4e2d\u9ad8\u9636\u51fd\u6570\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u4f18\u52bf\uff1a\u4ee3\u7801\u7b80\u6d01\u6027\uff1a\u7b80\u5316\u4ee3\u7801\uff0c\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002\u4ee3\u7801\u53ef\u91cd\u7528\u6027\uff1a\u4fc3\u8fdb\u4ee3\u7801\u91cd\u7528\uff0c\u9488\u5bf9\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u4f7f\u7528\u6cdb\u578b\u65b9\u6cd5\u3002\u7f16\u7a0b\u98ce\u683c\uff1a\u4e0e\u58f0\u660e\u5f0f\u7f16\u7a0b\u98ce\u683c\u5951\u5408\uff0c\u4ee5\u66f4\u62bd\u8c61\u7684\u65b9\u5f0f\u8868\u8fbe\u610f\u56fe\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf<\/strong><\/p>\n

\u9ad8\u9636\u51fd\u6570\u662f\u4e00\u79cd\u53ef\u4ee5\u63a5\u6536\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u51fd\u6570\u7684\u51fd\u6570\u3002\u5b83\u5728 Java 8 \u4e2d\u88ab\u5e7f\u6cdb\u5f15\u5165\uff0c\u4e3a\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u4f9b\u4e86\u8bb8\u591a\u4f18\u52bf\u3002<\/p>\n

1. \u4ee3\u7801\u7b80\u6d01\u6027<\/strong><\/p>\n

\u9ad8\u9636\u51fd\u6570\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\uff0c\u4f7f\u5176\u66f4\u5177\u53ef\u8bfb\u6027\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4f7f\u7528 forEach() \u65b9\u6cd5\u5bf9\u4e00\u4e2a\u5217\u8868\u8fdb\u884c\u8fed\u4ee3\uff1a<\/p>\n

List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nnumbers.forEach((Integer i) -> System.out.println(i));<\/pre>\n
\u7b49\u4ef7\u7684\u9ad8\u9636\u51fd\u6570\u5199\u6cd5\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nSystem.out.println(numbers);<\/pre>\n
2. \u4ee3\u7801\u53ef\u91cd\u7528\u6027<\/strong><\/p>\n
\u9ad8\u9636\u51fd\u6570\u53ef\u4ee5\u4fc3\u8fdb\u4ee3\u7801\u91cd\u7528\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u4e2a\u6cdb\u578b\u65b9\u6cd5\u4e2d\u4f7f\u7528\u63a5\u53d7 Comparator \u7684 lambda \u8868\u8fbe\u5f0f\u5bf9\u5217\u8868\u8fdb\u884c\u6392\u5e8f\uff1a<\/p>\n
<T> void sortList(List<T> list, Comparator<T> comparator) {\n    list.sort(comparator);\n}<\/pre>\n
\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u9488\u5bf9\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u91cd\u7528\u6b64\u65b9\u6cd5\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nsortList(numbers, (a, b) -> a.compareTo(b));\n\nList<String> names = List.of(\"John\", \"Alice\", \"Bob\");\nsortList(names, (a, b) -> a.compareToIgnoreCase(b));<\/pre>\n
3. \u7f16\u7a0b\u98ce\u683c<\/strong><\/p>\n
\u9ad8\u9636\u51fd\u6570\u4e0e\u58f0\u660e\u5f0f\u7f16\u7a0b\u98ce\u683c\u975e\u5e38\u5951\u5408\u3002\u4e0e\u4ee5\u547d\u4ee4\u5f0f\u65b9\u5f0f\u6307\u5b9a\u5982\u4f55\u6267\u884c\u64cd\u4f5c\u7684\u4f20\u7edf Java \u4ee3\u7801\u4e0d\u540c\uff0c\u9ad8\u9636\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u4ee5\u66f4\u62bd\u8c61\u3001\u66f4\u7b80\u6d01\u7684\u65b9\u5f0f\u8868\u8fbe\u6211\u4eec\u7684\u610f\u56fe\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8003\u8651\u4e00\u4e2a\u9700\u8981\u8ba1\u7b97\u5217\u8868\u4e2d\u6240\u6709\u5076\u6570\u548c\u7684\u7a0b\u5e8f\u3002\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u95ee\u9898\u5206\u89e3\u4e3a\u4e24\u4e2a\u8f83\u5c0f\u7684\u6b65\u9aa4\uff1a<\/p>\n
    \n
  1. \u4f7f\u7528 filter() \u8fc7\u6ee4\u5076\u6570<\/li>\n
  2. \u4f7f\u7528 mapToInt() \u5c06\u5076\u6570\u6620\u5c04\u5230\u5176\u503c\uff0c\u7136\u540e\u4f7f\u7528 sum() \u7d2f\u52a0\u7ed3\u679c<\/li>\n<\/ol>\n
    int sumEven(List<Integer> numbers) {\n    return numbers\n            .stream()\n            .filter(i -> i % 2 == 0)\n            .mapToInt(Integer::intValue)\n            .sum();\n}<\/pre>\n
    \u901a\u8fc7\u5229\u7528\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u66f4\u7b80\u6d01\u3001\u66f4\u53ef\u91cd\u7528\u3001\u66f4\u7b26\u5408\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u7684\u4ee3\u7801\u3002<\/p>\n
    \u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18\u52bf\u6709\u54ea\u4e9b\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9ad8\u9636\u51fd\u6570\u7684\u4f18...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203090","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203090"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203090\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}