{"id":203015,"date":"2025-05-22T09:41:21","date_gmt":"2025-05-22T01:41:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203015\/"},"modified":"2025-05-22T09:41:21","modified_gmt":"2025-05-22T01:41:21","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%a6%82%e4%bd%95%e6%8f%90%e9%ab%98%e4%bb%a3%e7%a0%81%e7%9a%84%e5%ae%89%e5%85%a8%e6%80%a7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203015\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\uff1f"},"content":{"rendered":"

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

Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\uff1f<\/h1>\n

\u6765\u5230\u7684\u5927\u5bb6\uff0c\u76f8\u4fe1\u90fd\u662f\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5e0c\u671b\u5728\u8fd9\u91cc\u5b66\u4e60\u6587\u7ae0\u76f8\u5173\u7f16\u7a0b\u77e5\u8bc6\u3002\u4e0b\u9762\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u5e26\u5927\u5bb6\u804a\u804a\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\uff1f\u300b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n

\u901a\u8fc7\u91c7\u7528 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u4e0d\u53ef\u53d8\u6027\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\u7279\u6027\uff0c\u53ef\u589e\u5f3a\u4ee3\u7801\u5b89\u5168\u6027:\u4e0d\u53ef\u53d8\u6027: \u9632\u6b62\u7ade\u6001\u6761\u4ef6\u548c\u591a\u7ebf\u7a0b\u9519\u8bef\uff0c\u786e\u4fdd\u503c\u5728\u521b\u5efa\u540e\u4e0d\u4f1a\u66f4\u6539\u3002\u7eaf\u51fd\u6570: \u6d88\u9664\u526f\u4f5c\u7528\u548c\u4e0d\u53ef\u9884\u6d4b\u884c\u4e3a\uff0c\u786e\u4fdd\u76f8\u540c\u8f93\u5165\u59cb\u7ec8\u4ea7\u751f\u76f8\u540c\u7ed3\u679c\u3002\u9ad8\u9636\u51fd\u6570: \u63d0\u4f9b\u5c06\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u503c\u7684\u7075\u6d3b\u6027\uff0c\u5141\u8bb8\u521b\u5efa\u66f4\u590d\u6742\u4e14\u53ef\u91cd\u7528\u7684\u4ee3\u7801\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\uff1a\u63d0\u5347\u4ee3\u7801\u5b89\u5168\u6027\u7684\u5f3a\u5927\u5de5\u5177<\/strong><\/p>\n

\u5f15\u8a00<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u56e0\u5176\u7b80\u6d01\u6027\u548c\u53ef\u91cd\u7528\u6027\u800c\u53d7\u5230\u5f00\u53d1\u4eba\u5458\u7684\u9752\u7750\u3002\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u53ef\u4ee5\u901a\u8fc7\u5f15\u5165\u30e9\u30e0\u8fbe\u8868\u8fbe\u5f0f\u548c Stream API \u6765\u5b9e\u73b0\u3002\u5b83\u4eec\u4e0d\u4ec5\u7b80\u5316\u4e86\u4ee3\u7801\uff0c\u8fd8\u63d0\u4f9b\u4e86\u589e\u5f3a\u5b89\u5168\u6027\u7684\u5f3a\u5927\u529f\u80fd\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u5982\u4f55\u4f7f\u7528 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u9ad8\u4ee3\u7801\u7684\u5b89\u5168\u6027\uff0c\u5e76\u63d0\u4f9b\u5b9e\u9645\u7684\u5b9e\u6218\u6848\u4f8b\u3002<\/p>\n

1. \u4e0d\u53ef\u53d8\u6027<\/strong><\/p>\n

\u4e0d\u53ef\u53d8\u6027\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6838\u5fc3\u539f\u5219\u4e4b\u4e00\u3002\u5b83\u610f\u5473\u7740\u503c\u5728\u521b\u5efa\u540e\u4e0d\u80fd\u88ab\u66f4\u6539\u3002\u8fd9\u6d88\u9664\u4e86\u7ade\u6001\u6761\u4ef6\u548c\u591a\u7ebf\u7a0b\u9519\u8bef\u7684\u98ce\u9669\uff0c\u56e0\u4e3a\u591a\u4e2a\u7ebf\u7a0b\u65e0\u6cd5\u540c\u65f6\u4fee\u6539\u540c\u4e00\u6570\u636e\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8ba1\u7b97\u7528\u6237\u8ba2\u5355\u603b\u989d\u7684\u51fd\u6570\uff1a<\/p>\n

public double calculateTotal(List<Order> orders) {\n  double total = 0;\n  for (Order order : orders) {\n    total += order.getPrice();\n  }\n  return total;\n}<\/pre>\n
\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u591a\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u4f1a\u540c\u65f6\u8c03\u7528\u6b64\u51fd\u6570\u5e76\u4fee\u6539\u603b\u548c\u53d8\u91cf\uff0c\u5bfc\u81f4\u4e0d\u51c6\u786e\u7684\u7ed3\u679c\u3002<\/p>\n
\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Stream API \u4ee5\u51fd\u6570\u5f0f\u65b9\u5f0f\u91cd\u5199\u6b64\u51fd\u6570\uff1a<\/p>\n
public double calculateTotal(List<Order> orders) {\n  return orders.stream()\n          .mapToDouble(Order::getPrice)\n          .sum();\n}<\/pre>\n
Stream API \u63d0\u4f9b\u7684 sum()<\/code> \u64cd\u4f5c\u5728\u5185\u90e8\u4f7f\u7528\u4e0d\u53ef\u53d8\u7684\u6570\u636e\u6d41\uff0c\u786e\u4fdd\u603b\u548c\u53d8\u91cf\u4e0d\u4f1a\u88ab\u610f\u5916\u66f4\u6539\u3002<\/p>\n
2. \u7eaf\u51fd\u6570<\/strong><\/p>\n
\u7eaf\u51fd\u6570\u4e0d\u4f9d\u8d56\u4e8e\u4efb\u4f55\u5916\u90e8\u72b6\u6001\uff0c\u5e76\u4e14\u603b\u662f\u4e3a\u76f8\u540c\u7684\u8f93\u5165\u4ea7\u751f\u76f8\u540c\u7684\u7ed3\u679c\u3002\u8fd9\u6d88\u9664\u4e86\u526f\u4f5c\u7528\u548c\u4e0d\u53ef\u9884\u6d4b\u884c\u4e3a\u7684\u98ce\u9669\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u9760\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n
\u4ee5\u4e0b\u4ee3\u7801\u4e3a\u4e00\u4e2a\u4e0d\u7eaf\u51fd\u6570\uff0c\u5b83\u4f9d\u8d56\u4e8e\u5916\u90e8\u72b6\u6001\uff08\u5f53\u524d\u65f6\u95f4\uff09\uff1a<\/p>\n
public String generateTimestamp() {\n  return new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\").format(new Date());\n}<\/pre>\n
\u8be5\u51fd\u6570\u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u8fd9\u5728\u9700\u8981\u751f\u6210\u4e00\u81f4\u65f6\u95f4\u6233\u7684\u60c5\u51b5\u4e0b\u53ef\u80fd\u5b58\u5728\u5b89\u5168\u98ce\u9669\u3002<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u521b\u5efa\u4e00\u4e2a\u7eaf\u51fd\u6570\u6765\u751f\u6210\u65f6\u95f4\u6233\uff1a<\/p>\n
import java.time.LocalDateTime;\n\npublic String generateTimestamp() {\n  return LocalDateTime.now().toString();\n}<\/pre>\n
\u8be5\u51fd\u6570\u603b\u662f\u8fd4\u56de\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u7684\u5b57\u7b26\u4e32\u8868\u793a\uff0c\u6d88\u9664\u4e86\u526f\u4f5c\u7528\u548c\u4e0d\u53ef\u9884\u6d4b\u884c\u4e3a\u3002<\/p>\n
3. \u9ad8\u9636\u51fd\u6570<\/strong><\/p>\n
\u9ad8\u9636\u51fd\u6570\u53ef\u4ee5\u5c06\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u503c\u3002\u8fd9\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06\u51fd\u6570\u7ec4\u5408\u5728\u4e00\u8d77\u7684\u65b9\u5f0f\uff0c\u4ece\u800c\u521b\u5efa\u66f4\u590d\u6742\u4e14\u53ef\u91cd\u7528\u7684\u4ee3\u7801\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n
\u4ee5\u4e0b\u4ee3\u7801\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u5bf9\u8ba2\u5355\u5217\u8868\u8fdb\u884c\u8fc7\u6ee4\uff1a<\/p>\n
List<Order> filteredOrders = orders.stream()\n          .filter(order -> order.getStatus() == OrderStatus.PENDING)\n          .collect(Collectors.toList());<\/pre>\n
filter()<\/code> \u64cd\u4f5c\u4f7f\u7528\u533f\u540d\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u6839\u636e\u8ba2\u5355\u72b6\u6001\u5bf9\u8ba2\u5355\u5217\u8868\u8fdb\u884c\u8fc7\u6ee4\u3002\u8fd9\u63d0\u4f9b\u4e86\u7075\u6d3b\u6027\u548c\u91cd\u7528\u6027\uff0c\u56e0\u4e3a\u533f\u540d\u51fd\u6570\u53ef\u4ee5\u6839\u636e\u7279\u5b9a\u9700\u6c42\u8fdb\u884c\u5b9a\u5236\u3002<\/p>\n
\u7ed3\u8bba<\/strong><\/p>\n
Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u901a\u8fc7\u4e0d\u53ef\u53d8\u6027\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\u7b49\u7279\u6027\u63d0\u4f9b\u4e86\u589e\u5f3a\u4ee3\u7801\u5b89\u5168\u6027\u7684\u6709\u529b\u5de5\u5177\u3002\u901a\u8fc7\u91c7\u7528\u8fd9\u4e9b\u539f\u5219\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u521b\u5efa\u66f4\u53ef\u9760\u3001\u66f4\u5b89\u5168\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u7ade\u6001\u6761\u4ef6\u3001\u591a\u7ebf\u7a0b\u9519\u8bef\u548c\u4e0d\u53ef\u9884\u6d4b\u884c\u4e3a\u7684\u98ce\u9669\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u7684...<\/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-203015","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203015","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=203015"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203015\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}