{"id":58566,"date":"2024-10-12T20:51:15","date_gmt":"2024-10-12T12:51:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/58566\/"},"modified":"2024-10-12T20:51:15","modified_gmt":"2024-10-12T12:51:15","slug":"android%e6%87%89%e7%94%a8%e9%96%8b%e7%99%bc%e6%8a%80%e5%b7%a7%e4%b9%8blist%e5%8e%bb%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e5%ba%ab-android-list%e5%8e%bb%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/58566\/","title":{"rendered":"Android\u61c9\u7528\u958b\u767c\u6280\u5de7\u4e4blist\u53bb\u91cd\u8907\u6578\u64da\u5eab (android list\u53bb\u91cd\u8907\u6578\u64da\u5eab)"},"content":{"rendered":"

Android\u61c9\u7528\u958b\u767c\u6280\u5de7\u4e4blist\u53bb\u91cd\u8907\u6578\u64da\u5eab<\/h1>\n

\u5728Android\u61c9\u7528\u958b\u767c\u4e2d\uff0c\u6578\u64da\u7684\u7ba1\u7406\u548c\u8655\u7406\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5217\u8868\u6578\u64da\u6642\uff0c\u53bb\u9664\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Android\u61c9\u7528\u4e2d\u6709\u6548\u5730\u53bb\u9664\u5217\u8868\u4e2d\u7684\u91cd\u8907\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n

\u70ba\u4ec0\u9ebc\u9700\u8981\u53bb\u91cd\u8907\u6578\u64da<\/h2>\n

\u5728\u958b\u767c\u61c9\u7528\u6642\uff0c\u6578\u64da\u7684\u91cd\u8907\u53ef\u80fd\u6703\u5c0e\u81f4\u7528\u6236\u9ad4\u9a57\u7684\u4e0b\u964d\u3002\u4f8b\u5982\uff0c\u5728\u986f\u793a\u806f\u7d61\u4eba\u3001\u5546\u54c1\u5217\u8868\u6216\u4efb\u4f55\u9700\u8981\u5c55\u793a\u7684\u6578\u64da\u6642\uff0c\u91cd\u8907\u7684\u9805\u76ee\u6703\u4f7f\u754c\u9762\u986f\u5f97\u96dc\u4e82\u7121\u7ae0\uff0c\u4e26\u53ef\u80fd\u5f71\u97ff\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u53bb\u9664\u91cd\u8907\u6578\u64da\u662f\u63d0\u5347\u61c9\u7528\u8cea\u91cf\u7684\u91cd\u8981\u6b65\u9a5f\u3002<\/p>\n

\u53bb\u91cd\u8907\u6578\u64da\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n

\u5728Android\u4e2d\uff0c\u6709\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u53bb\u9664\u5217\u8868\u4e2d\u7684\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u6709\u6548\u7684\u6280\u8853\uff1a<\/p>\n

1. \u4f7f\u7528Set\u96c6\u5408<\/h3>\n

Java\u4e2d\u7684Set\u96c6\u5408\u4e0d\u5141\u8a31\u91cd\u8907\u5143\u7d20\uff0c\u56e0\u6b64\u53ef\u4ee5\u5229\u7528\u9019\u4e00\u7279\u6027\u4f86\u53bb\u9664\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

List<String> originalList = new ArrayList<>();\noriginalList.add(\"Apple\");\noriginalList.add(\"Banana\");\noriginalList.add(\"Apple\");\noriginalList.add(\"Orange\");\n\nSet<String> set = new HashSet<>(originalList);\nList<String> uniqueList = new ArrayList<>(set);\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500b\u5305\u542b\u91cd\u8907\u5143\u7d20\u7684\u5217\u8868\uff0c\u7136\u5f8c\u5c07\u5176\u8f49\u63db\u70baSet\u96c6\u5408\uff0c\u6700\u5f8c\u518d\u8f49\u63db\u56deList\uff0c\u5f9e\u800c\u7372\u5f97\u4e00\u500b\u4e0d\u5305\u542b\u91cd\u8907\u5143\u7d20\u7684\u5217\u8868\u3002<\/p>\n
2. \u4f7f\u7528\u6d41\uff08Streams\uff09API<\/h3>\n
\u5982\u679c\u60a8\u4f7f\u7528\u7684\u662fJava 8\u6216\u66f4\u9ad8\u7248\u672c\uff0c\u53ef\u4ee5\u5229\u7528\u6d41\uff08Streams\uff09API\u4f86\u7c21\u5316\u53bb\u91cd\u7684\u904e\u7a0b\uff1a<\/p>\n
List<String> uniqueList = originalList.stream()\n    .distinct()\n    .collect(Collectors.toList());\n<\/code><\/pre>\n
\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u7c21\u6f54\uff0c\u800c\u4e14\u53ef\u8b80\u6027\u5f37\uff0c\u9069\u5408\u8655\u7406\u8f03\u5927\u7684\u6578\u64da\u96c6\u3002<\/p>\n
3. \u81ea\u5b9a\u7fa9\u53bb\u91cd\u908f\u8f2f<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6839\u64da\u7279\u5b9a\u7684\u689d\u4ef6\u4f86\u53bb\u9664\u91cd\u8907\u6578\u64da\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u7fa9\u7684\u908f\u8f2f\u4f86\u5be6\u73fe\uff1a<\/p>\n
List<MyObject> originalList = ...;\nList<MyObject> uniqueList = new ArrayList<>();\n\nfor (MyObject obj : originalList) {\n    if (!uniqueList.contains(obj)) {\n        uniqueList.add(obj);\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u904d\u6b77\u539f\u59cb\u5217\u8868\uff0c\u4e26\u6aa2\u67e5\u6bcf\u500b\u5143\u7d20\u662f\u5426\u5df2\u7d93\u5b58\u5728\u65bc\u552f\u4e00\u5217\u8868\u4e2d\uff0c\u5f9e\u800c\u5be6\u73fe\u81ea\u5b9a\u7fa9\u7684\u53bb\u91cd\u908f\u8f2f\u3002<\/p>\n
\u6578\u64da\u5eab\u4e2d\u7684\u53bb\u91cd<\/h2>\n
\u5728\u8655\u7406\u6578\u64da\u5eab\u6642\uff0c\u53bb\u91cd\u7684\u9700\u6c42\u540c\u6a23\u5b58\u5728\u3002\u4f7f\u7528SQL\u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u552f\u4e00\u7684\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT DISTINCT column_name FROM table_name;\n<\/code><\/pre>\n
\u9019\u689dSQL\u8a9e\u53e5\u5c07\u8fd4\u56de\u6307\u5b9a\u5217\u4e2d\u7684\u552f\u4e00\u503c\uff0c\u5f9e\u800c\u907f\u514d\u91cd\u8907\u6578\u64da\u7684\u51fa\u73fe\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728Android\u61c9\u7528\u958b\u767c\u4e2d\uff0c\u53bb\u9664\u5217\u8868\u4e2d\u7684\u91cd\u8907\u6578\u64da\u662f\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u7121\u8ad6\u662f\u4f7f\u7528Set\u96c6\u5408\u3001\u6d41\uff08Streams\uff09API\uff0c\u9084\u662f\u81ea\u5b9a\u7fa9\u908f\u8f2f\uff0c\u958b\u767c\u8005\u90fd\u53ef\u4ee5\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u3002\u6b64\u5916\uff0c\u5728\u6578\u64da\u5eab\u4e2d\u4f7f\u7528SQL\u7684DISTINCT\u95dc\u9375\u5b57\u4e5f\u80fd\u6709\u6548\u5730\u53bb\u9664\u91cd\u8907\u6578\u64da\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u61c9\u7528\u7684\u6027\u80fd\uff0c\u9084\u80fd\u4f7f\u6578\u64da\u5c55\u793a\u66f4\u52a0\u6e05\u6670\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bcVPS<\/a><\/em>\u548c\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Android\u61c9\u7528\u958b\u767c\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u53bb\u91cd\u8907\u6578\u64da\u5eab\u4e2d\u7684\u5217\u8868\u6578\u64da\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u8207\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-58566","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58566","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=58566"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58566\/revisions"}],"predecessor-version":[{"id":58567,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58566\/revisions\/58567"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=58566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=58566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=58566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}