- 技术博客
- 集合去重对象问题
业务解决
public class Test {
public static void main(String
[] args
){
User user
= new User("1","2");
User user1
= new User("1","2");
User user2
= new User("1","2");
List
<User> list
= new ArrayList<User>();
List
<User> list1
= new ArrayList<User>();
list
.add(user
);
list
.add(user
);
list
.add(user1
);
list
.add(user2
);
list1
.add(user
);
list1
.add(user
);
list1
.add(user1
);
list1
.add(user2
);
list
.addAll(list
);
List
<User> listNew2
= new ArrayList<User>(new TreeSet<>(list
));
System
.out
.println("listNew2 = " + listNew2
);
}
}
实体类对象
public class User implements Comparable {
private String name
;
private String addr
;
public User(String name
, String addr
) {
this.name
= name
;
this.addr
= addr
;
}
@Override
public int compareTo(Object o
) {
if (this.name
.equals(((User
) o
).name
)) {
System
.out
.println("相等");
return 0;
}
return 1;
}
}
