{"id":634,"date":"2018-03-01T11:27:10","date_gmt":"2018-03-01T03:27:10","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=634"},"modified":"2019-09-01T11:28:14","modified_gmt":"2019-09-01T03:28:14","slug":"java%e4%b8%adlist%e6%95%b0%e6%8d%ae%e5%90%88%e5%b9%b6%e4%b8%8e%e5%8e%bb%e9%87%8d","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=634","title":{"rendered":"java\u4e2dList\u6570\u636e\u5408\u5e76\u4e0e\u53bb\u91cd"},"content":{"rendered":"

\u5355\u4e2aList\u6570\u636e\u53bb\u91cd<\/h1>\n

\u601d\u8def\uff1a\u5229\u7528HashSet
\n\u4ee3\u7801\uff1a<\/p>\n

        List<String> list = new ArrayList<>();\r\n        list.add(\"a\");\r\n        list.add(\"b\");\r\n        list.add(\"c\");\r\n        list.add(\"c\");\r\n        list.add(\"c\");\r\n        for (String string : list) {\r\n            System.out.println(string);\r\n        }\r\n        System.out.println(\"=============================\");\r\n        \/\/\u8f6c\u6210set\r\n        List<String> listWithoutDup = new ArrayList<>(new HashSet<>(list));\r\n        for (String str : listWithoutDup) {\r\n            System.out.println(str);\r\n        }\r\n<\/code><\/pre>\n
<\/p>\n
\u591a\u4e2aList\u5408\u5e76\uff0c\u6570\u636e\u53bb\u91cd<\/h1>\n
java 8 \u4e4b\u524d<\/h2>\n
\u601d\u8def\uff1a<\/p>\n
    \n
  1. list1.removeAll(list2)<\/li>\n
  2. list1.addAll(list2)
    \n\u4ee3\u7801<\/li>\n<\/ol>\n
    public static void main(String[] args) {\r\n        List<String> list = new ArrayList<>();\r\n        List<String> list2 = new ArrayList<>();\r\n        list.add(\"a\");\r\n        list.add(\"b\");\r\n        list.add(\"c\");\r\n        list.add(\"c\");\r\n        list2.add(\"a\");\r\n        list2.add(\"e\");\r\n        list2.add(\"e\");\r\n        list2.add(\"g\");\r\n        list2.add(\"g\");\r\n        for (String string : list) {\r\n            System.out.println(string);\r\n        }\r\n         \/\/\u6b64\u5904\u6307\u7684\u662f\u5c06\u4e0elist2\u91cd\u590d\u7684\u5220\u9664\r\n        list.removeAll(list2);\r\n        \/\/\u6b64\u5904\u6307\u52a0\u4e0alist2\r\n        list.addAll(list2);\r\n        System.out.println(\"=============================\");\r\n        for (String string : list) {\r\n            System.out.println(string);\r\n        }\r\n    }\r\n<\/code><\/pre>\n
    java 8\u4ee5\u53ca\u66f4\u9ad8\u7248\u672c\uff1alambda\u8868\u8fbe\u5f0f<\/h2>\n
    List<String> result = Stream.of(Lists.newArrayList(\"1\", \"1\", \"3\"), Lists.newArrayList(\"1\", \"2\"))\r\n  .flatMap(Collection::stream).distinct().collect(Collectors.toList());\r\n<\/code><\/pre>\n
    \u4ee3\u7801\u5f88\u4f18\u96c5\uff0c\u4f46\u662f\u8981\u5408\u5e76\u7684list\u5185\u5143\u7d20\u662f\u5bf9\u8c61\u9700\u8981equals\u548chashcode\u65b9\u6cd5<\/strong><\/p>\n
    \u53c2\u8003\u8d44\u6599\uff1a<\/p>\n