废话不多说，直接上代码
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class User {
public static void main(String[] args) {
List<User> list = new ArrayList<>();
list.add(new User("张三",18));
list.add(new User("诸葛亮",69));
list.add(new User("孙悟空",500));
list.add(new User("周杰伦",45));
list.add(new User("郭德纲",60));
list.add(new User("秦始皇",5000));
System.out.println("排序前：");
System.out.println(list);
Collections.sort(list, new Comparator<User>() {
@Override
public int compare(User o1, User o2) {
int age1 = o1.getAge();
int age2 = o2.getAge();
if (age1 == age2) {
return 0;
}else {
// 从小到大
return age1 > age2 ? 1 : -1 ;
// 如果需要从大到小，可以将return的值反过来即可
}
}
});
System.out.println("排序后：");
System.out.println(list);
}
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public User(String name, int age) {
super();
this.name = name;
this.age = age;
}
public User() {
super();
}
@Override
public String toString() {
return "User [name=" + name + ", age=" + age + "]";
}
}
