Iterator的使用

import java.util.*;
public class Test{
public static void main(String args[]){
List<Person> list=new ArrayList<Person>();
list.add(new Person("jack",21));
list.add(new Person("rose",18));
list.add(new Person("tom",19));
list.add(new Person("spring",20));
Collections.sort();
Iterator<Person> i=list.iterator();
for(;i.hasNext();){
Person p=i.next();
System.out.println(p);
}
}
}