Java 中List 集合索引遍历与迭代器遍历

package yzhou.iterator;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class Test01
{
    public static void main(String[] args)
    {
        List list  = new ArrayList();
        
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        
        //通过索引遍历List
        for(int i=0;i<list.size();i++)
        {
            System.out.println(list.get(i));
        }
        
        //通过迭代器遍历List
        for(Iterator iter2  = list.iterator();iter2.hasNext();)
        {
            String str = (String) iter2.next();
            System.out.println(str);
            iter2.remove();
        }
        
        System.out.println(list.size()+"************************************");
        
        Set set = new HashSet();
        set.add("zhangsan1");
        set.add("zhangsan2");
        set.add("zhangsan3");
        
//        Iterator iter = set.iterator();
//        while(iter.hasNext())
//        {
//            String str = (String)iter.next();
//            System.out.println(str);
//        }
        
        for(Iterator iter = set.iterator();iter.hasNext();)
        {
            String str = (String)iter.next();
            System.out.println(str);
        }
    }
}

for(Iterator iter = set.iterator();iter.hasNext();)
        {
            String str = (String)iter.next();
            System.out.println(str);
        }