集合案例--对ArrayList容器中的内容进行排序

package com.Set;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
 
public class ArrayListDemo4 {
    public static void main(String[] args) {
        List<Person> list = new ArrayList<Person>();
        list.add(new Person("jak", 20));
        list.add(new Person("roos", 10));
        list.add(new Person("marry", 30));
        list.add(new Person("jack", 20));
        Collections.sort(list, new Comparator<Person>() {
 
            @Override
            public int compare(Person o1, Person o2) {
                if (o1.getAge() - o2.getAge() > 0) {
                    return 1;
                } else if (o1.getAge() - o2.getAge() < 0) {
                    return -1;
                }
                return o1.getName().compareTo(o2.getName());
            }
 
        });
        for(Person p:list) {
            System.out.println(p.getAge()+p.getName());
        }
    }
}
 
class Person {
    private String name;
    private int age;
 
    public Person(String name, int age) {
        this.name = name;
        this.age = 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;
    }
 
}