源程序：
package javaquestions;
import java.util.ArrayList;
import java.util.Iterator;
public class JavaQuestion20160829
{
public static void main(String[] args)
{
ArrayList<Person> al = new ArrayList<Person>();
al.add(new Person("zhangsan22", 22));
al.add(new Person("zhangsan23", 23));
al.add(new Person("zhangsan24", 24));
al.add(new Person("zhangsan25", 25));
Iterator<Person> it = al.iterator();
while (it.hasNext())
{
System.out.println(it.next().name + " -- " + it.next().age);
}
}
}
class Person
{
String name;
int age;
Person(String name, int age)
{
this.name = name;
this.age = age;
}
}