集合去重

直接上代码，记录下，方便下次直接用：

@Test
    public void distinctMyUser() {
        List<MyUser> list1 = new ArrayList<>();
        MyUser user1 = new MyUser();
        user1.setUserName("zhangsan");
        user1.setPassWord("1234567");
        list1.add(user1);

        MyUser user2 = new MyUser();
        user2.setUserName("zhangsan");
        user2.setPassWord("123456");
        list1.add(user2);

        MyUser user3 = new MyUser();
        user3.setUserName("lisi");
        user3.setPassWord("123456");
        list1.add(user3);

        MyUser user4 = new MyUser();
        user4.setUserName("lisi");
        user4.setPassWord("123456");
        list1.add(user4);

        for (MyUser b : list1) {
            System.out.println("去重前：" + b.toString());
        }

        //去重
        list1 = removeDuplicateOutputField(list1);

        for (MyUser b : list1) {
            System.out.println("去重后：" + b.toString());
        }
    }

    /**
     * 根据list中对象某些字段去重
     * @param list 需要去重的list
     * @return 返回去重后的list
     */
    private static List<MyUser> removeDuplicateOutputField(List<MyUser> list) {
        Set<MyUser> set = new TreeSet<>(new Comparator<MyUser>() {
            @Override
            public int compare(MyUser myUser, MyUser myUserNew) {
                int compareToResult = 1;//==0表示重复
                //需要去重的字段在此处比较过滤
                if(StringUtils.equals(myUser.getUserName(), myUserNew.getUserName()) &&
                        StringUtils.equals(myUser.getPassWord(), myUserNew.getPassWord())) {
                    compareToResult = 0;
                }
                return compareToResult;
            }
        });
        set.addAll(list);
        return new ArrayList<>(set);
    }

    @Data
    public class MyUser {
        private String userName;
        private String passWord;
    }

运行后的结果：