集合(Collection):

eg: ArrayList;HashMap等.

迭代器(Iterator):

import java.util.ArrayList;

import java.util.Iterator;

public class Test15 {

public static void main\(String\[\] args\) {

    // TODO Auto-generated method stub

    ArrayList<String> na = new ArrayList<String>\(\);

    na.add\("test1"\);

    na.add\("test2"\);

    na.add\("test3"\);

    Iterator<String> it =na.iterator\(\); 

    while\(it.hasNext\(\)\){

        System.out.println\("name:"+it.next\(\)\);

    }

}

}