List集合里面按照人的年龄属性排序

目的：将装入ArrayList集合里面的对象按照对象年龄排序。

方法实现：通过实现Comparable接口，重写compareTo()方法实现。

User.java

package com.zmj.javase.listsort;

/**
* 通过实现Comparable接口，重写compareTo()方法实现
* @author zhou
*
*/
public class User implements Comparable<User> {
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;
}

@Override
public int compareTo(User o) {
if(o.age>this.age){
return 1;
}else if(o.age>this.age){
return 0;
}else{
return -1;
}
}
}
LIstSortMain.java
package com.zmj.javase.listsort;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
* 测试类
* @author 周
*
*/
public class ListSortDemo {
public static void main(String[] args) {

List<User> list = new ArrayList<User>();

list.add(new User("zhou", 12));
list.add(new User("meng", 11));
list.add(new User("jun", 13));

Collections.sort(list);//通过Collections类的sort()方法排序
//遍历
for(User user : list){
System.out.println(user.getAge());
}
}
}
运行无误。