Demo
/**
* @qvthor liuwenzheng
* @date 2021/5/10 10:25
*/
public class Demo {
public static void main(String[] args) {
ArrayList<User> list = new ArrayList<>();
User zhangsan = new User(15,"zhangsan",98);
User lisi = new User(13,"lisi",70);
User wangwu = new User(17,"wangwu",88);
list.add(zhangsan);
list.add(lisi);
list.add(wangwu);
System.out.println(list);
System.out.println(list);
Collections.sort(list, new Comparator<User>() {
@Override
public int compare(User o1, User o2) {
return o1.getUid()-o2.getUid();
}
});
}
}
User
package sort;
/**
* @qvthor liuwenzheng
* @date 2021/5/10 10:19
*/
// 排序
public class User /*implements Comparable*/{
private Integer uid ;
private String name ;
private Integer grade ;
public User(){
}
public User(Integer uid ,String name , Integer grade){
this.uid = uid ;
this.grade = grade ;
this.name = name ;
}
public Integer getUid() {
return uid;
}
public String getName() {
return name;
}
public Integer getGrade() {
return grade;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public void setName(String name) {
this.name = name;
}
public void setGrade(Integer grade) {
this.grade = grade;
}
@Override
public String toString() {
return "User{" +
"uid=" + uid +
", name='" + name + '\'' +
", grade=" + grade +
'}';
}
// @Override
// public int compareTo(Object o) {
// return 0;
// }
}
