{"id":202834,"date":"2025-05-22T11:39:33","date_gmt":"2025-05-22T03:39:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202834\/"},"modified":"2025-05-22T11:39:33","modified_gmt":"2025-05-22T03:39:33","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e8%8c%83%e5%bc%8f%e5%9c%a8-java-%e4%b8%ad%e7%bc%96%e5%86%99%e6%b5%8b%e8%af%95%e7%94%a8%e4%be%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202834\/","title":{"rendered":"\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u5728 Java \u4e2d\u7f16\u5199\u6d4b\u8bd5\u7528\u4f8b\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u5728 Java \u4e2d\u7f16\u5199\u6d4b\u8bd5\u7528\u4f8b\uff1f<\/h1>\n

\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300a\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u5728 Java \u4e2d\u7f16\u5199\u6d4b\u8bd5\u7528\u4f8b\uff1f\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u901a\u8fc7\u8fd0\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\uff0cJava\u6d4b\u8bd5\u7528\u4f8b\u53ef\u4ee5\u53d8\u5f97\u66f4\u52a0\u7b80\u6d01\u548c\u53ef\u8bfb\u6027\u66f4\u5f3a\uff1a\u5229\u7528\u7eaf\u51fd\u6570\uff0c\u786e\u4fdd\u6bcf\u6b21\u76f8\u540c\u8f93\u5165\u90fd\u4f1a\u4ea7\u751f\u76f8\u540c\u8f93\u51fa\uff0c\u4ece\u800c\u7b80\u5316\u9694\u79bb\u548c\u6d4b\u8bd5\u4ee3\u7801\u3002\u91c7\u7528\u4e0d\u53ef\u53d8\u6570\u636e\uff0c\u907f\u514d\u610f\u5916\u526f\u4f5c\u7528\u548c\u786e\u4fdd\u53ef\u9884\u6d4b\u7684\u6d4b\u8bd5\u7ed3\u679c\u3002\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\uff0c\u533f\u540d\u5b9a\u4e49\u51fd\u6570\uff0c\u65b9\u4fbf\u4f20\u9012\u7ed9\u6d4b\u8bd5\u65b9\u6cd5\u548c\u65ad\u8a00\u3002\u6d3b\u7528 Stream API\uff0c\u5bf9\u6570\u636e\u96c6\u8fdb\u884c\u51fd\u6570\u5f0f\u64cd\u4f5c\uff0c\u7b80\u5316\u9a8c\u8bc1\u548c\u805a\u5408\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u5728 Java \u4e2d\u7f16\u5199\u6d4b\u8bd5\u7528\u4f8b<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u51fd\u6570\u7684\u4f7f\u7528\uff0c\u7eaf\u51fd\u6570\u548c\u4e0d\u53ef\u53d8\u6570\u636e\u3002\u5b83\u53ef\u4ee5\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u6d4b\u8bd5\u6027\uff0c\u4f7f\u6d4b\u8bd5\u7528\u4f8b\u66f4\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u4f73\u3002<\/p>\n

\u7eaf\u51fd\u6570<\/strong><\/p>\n

\u7eaf\u51fd\u6570\u4e0d\u4f1a\u6539\u53d8\u5176\u8f93\u5165\u6216\u5916\u90e8\u72b6\u6001\u3002\u8fd9\u610f\u5473\u7740\u6bcf\u6b21\u4f20\u5165\u76f8\u540c\u53c2\u6570\u65f6\uff0c\u5b83\u90fd\u4f1a\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\u3002\u5728\u6d4b\u8bd5\u4e2d\uff0c\u8fd9\u8ba9\u6211\u4eec\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u9694\u79bb\u548c\u6d4b\u8bd5\u4ee3\u7801\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u7279\u5b9a\u8f93\u5165\u5c06\u603b\u662f\u4ea7\u751f\u76f8\u540c\u7684\u8f93\u51fa\u3002<\/p>\n

\u4e0d\u53ef\u53d8\u6570\u636e<\/strong><\/p>\n

\u4e0d\u53ef\u53d8\u6570\u636e\u4e0d\u80fd\u88ab\u4fee\u6539\u3002\u8fd9\u6709\u52a9\u4e8e\u6211\u4eec\u5728\u6d4b\u8bd5\u65f6\u907f\u514d\u610f\u5916\u7684\u526f\u4f5c\u7528\uff0c\u5e76\u786e\u4fdd\u6d4b\u8bd5\u7ed3\u679c\u59cb\u7ec8\u53ef\u9884\u6d4b\u3002\u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 final<\/code> \u5173\u952e\u5b57\u6765\u58f0\u660e\u53d8\u91cf\u4e0d\u53ef\u53d8\uff0c\u6216\u8005\u4f7f\u7528\u4e0d\u53ef\u53d8\u96c6\u5408\u7c7b\uff0c\u5982 ImmutableList<\/code> \u548c ImmutableMap<\/code>\u3002<\/p>\n

Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u5b9a\u4e49\u533f\u540d\u7684\u51fd\u6570\u3002\u5b83\u4eec\u5728\u6d4b\u8bd5\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u5b83\u4eec\u4f20\u9012\u7ed9\u6d4b\u8bd5\u65b9\u6cd5\u548c\u65ad\u8a00\u3002\u4f8b\u5982\uff1a<\/p>\n

\/\/ \u9a8c\u8bc1\u4e00\u4e2a\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\nList<String> names = new ArrayList<>();\nassertTrue(names.isEmpty(), () -> \"\u96c6\u5408\u4e0d\u4e3a\u7a7a\");<\/pre>\n
Stream API<\/strong><\/p>\n
Java \u4e2d\u7684 Stream API \u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u51fd\u6570\u5f0f\u64cd\u4f5c\uff0c\u53ef\u7528\u4e8e\u5904\u7406\u6570\u636e\u96c6\u5408\u3002\u8fd9\u5728\u6d4b\u8bd5\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5bf9\u6570\u636e\u96c6\u8fdb\u884c\u8fc7\u6ee4\u3001\u6620\u5c04\u548c\u805a\u5408\u3002\u4f8b\u5982\uff1a<\/p>\n
\/\/ \u9a8c\u8bc1\u4e00\u4e2a\u5b57\u7b26\u4e32\u5217\u8868\u4e2d\u6240\u6709\u5b57\u7b26\u4e32\u90fd\u4ee5 \"A\" \u5f00\u5934\nList<String> names = List.of(\"Alice\", \"Bob\", \"Charlie\");\nassertTrue(names.stream().allMatch(s -> s.startsWith(\"A\")), () -> \"\u4e0d\u662f\u6240\u6709\u5b57\u7b26\u4e32\u90fd\u4ee5 'A' \u5f00\u5934\");<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8003\u8651\u4e00\u4e2a Todo \u5e94\u7528\uff0c\u6211\u4eec\u60f3\u6d4b\u8bd5 TodoService<\/code> \u7684 addTodo<\/code> \u65b9\u6cd5\uff1a<\/p>\n
class TodoService {\n    private List<Todo> todos = new ArrayList<>();\n\n    public void addTodo(Todo todo) {\n        todos.add(todo);\n    }\n}<\/pre>\n
\u4f20\u7edf\u6d4b\u8bd5\u65b9\u6cd5\uff1a<\/strong><\/p>\n
@Test\npublic void addTodo_addsTodoToService() {\n    \/\/ ...\n}<\/pre>\n
\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u91cd\u6784\u540e\u7684\u6d4b\u8bd5\u65b9\u6cd5\uff1a<\/strong><\/p>\n
@Test\npublic void addTodo_addsTodoToService() {\n    Todo todo = new Todo(\"Buy milk\");\n\n    \/\/ \u65ad\u8a00\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\n    assertDoesNotThrow(() -> todoService.addTodo(todo), () -> \"\u6dfb\u52a0 todo \u5931\u8d25\");\n\n    \/\/ \u4f7f\u7528 Stream API \u9a8c\u8bc1 todo \u5df2\u6dfb\u52a0\u5230\u670d\u52a1\n    assertEquals(1, todoService.getTodos().size(), () -> \"todo \u672a\u6dfb\u52a0\u5230\u670d\u52a1\");\n}<\/pre>\n
\u901a\u8fc7\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u66f4\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u4f73\u548c\u53ef\u7ef4\u62a4\u6027\u66f4\u9ad8\u7684\u6d4b\u8bd5\u7528\u4f8b\u3002\u66f4\u5c11\u7684\u6837\u677f\u4ee3\u7801\u4e5f\u80fd\u8ba9\u9519\u8bef\u66f4\u5bb9\u6613\u88ab\u53d1\u73b0\uff0c\u63d0\u9ad8\u4e86\u6574\u4f53\u4ee3\u7801\u8d28\u91cf\u3002<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u5728 Jav...<\/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-202834","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202834","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=202834"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202834\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}