Java ArrayList排序

常常遇到数组排序的问题.比如我有一个Person类,它的实例对象存储在ArrayList数组中,现在要把ArrayList数组中的Person对象按照年龄排序.
其实这种情况经常遇到.
下面给出源代码:

1:Person.Java文件:-------------------------------
public class Person{
String name;
int age;

public Person(String name,int age){
this.name = name;
this.age = age;

}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}

2:Mycomparator.java-------------------------------
//实现Comparator接口,也就是定义排序规则,你几乎可以定义任何规则
package com.infoearth;
import java.util.*;
public class Mycomparator implements Comparator{

public int compare(Object o1,Object o2) {
Person p1=(Person)o1;
Person p2=(Person)o2;
if(p1.age<p2.age)
return 1;
else
return 0;
}

}

3:ListSort.java------------------------------------

package com.infoearth;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class ListSort {
public static void main(String[] args){
ArrayList list = new ArrayList();
list.add(new Person("lcl",28));
list.add(new Person("fx",23));
list.add(new Person("wqx",29));
Comparator comp = new Mycomparator();
Collections.sort(list,comp);
for(int i = 0;i<list.size();i ){
Person p = (Person)list.get(i);
System.out.println(p.getName());
}

}

}

当然，如果你的List包装的是基本类型或者String，则只要 Collections.sort(list);即可