【Java8 中list对象中对象的多属性去重】

【Java8 中list对象中对象的多属性去重】

直接上代码：

public static void main(String[] args) {
	List<User> list = new ArrayList<User>();
    User u1 = new User();
    u1.setUserName("1");
    u1.setPassWord("123");
    User u2 = new User();
    u2.setUserName("2");
    u2.setPassWord("123");
    User u3 = new User();
    u3.setUserName("1");
    u3.setPassWord("456");
   
    list.add(u1);
    list.add(u2);
    list.add(u3);
	List<User> result = list.stream().collect(
        	Collectors.collectingAndThen(
        		Collectors.toCollection(
        			() -> new TreeSet<User>(Comparator.comparing(p -> p.getUserName()))),ArrayList::new));
 
    for (User u : result) {
        System.out.println(u.getUserName() + " " + u.getPassWord());
    }

}

如果是一个对象多个属性这样写：分号分隔

	List<User> result = list.stream().collect(
        	Collectors.collectingAndThen(
        		Collectors.toCollection(
        			() -> new TreeSet<User>(Comparator.comparing(p -> p.getUserName()+";"+p.getPassWord()))),ArrayList::new));