import java.util.*;
import java.util.Map.Entry;

public class test {

    public static void main(String[] args) {
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
       //在这里也可以用list.get(i)来取得第i个元素
        Iterator it = list.iterator();
        while (it.hasNext()) {
            Map<String, Object> map = (Map) it.next();
            Set<Entry<String, Object>> entrySet = map.entrySet();
            for (Entry<String, Object> entry : entrySet) {
                //do something...................
            }
        }

    }
}

------解决方案--------------------
package com.alaric.test;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/**
  *  
  * @Description :
  * @author alaric   
  * @version 1.0 
  * @created 2012 May 12, 2012 8:31:23 PM
  * @fileName com.alaric.test.Test.java
  */
public class Test {

	    public static void main(String[] args) {
	        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
	        /**
	         * list 可以用for each 来遍历  也可用迭代器来遍历
	         */
	       for(Map<String, Object> map:list){
	    	   Iterator<String> iterator = map.keySet().iterator();
	    	   while (iterator.hasNext()) {
					String key = iterator.next();
					Object obj = map.get(key);
				
			}
	       }
	       /**
	         * map 可以用for each 来遍历  也可用迭代器来遍历
	         */
	       Iterator <Map<String,Object>>it = list.iterator();
	        while (it.hasNext()) {
	            Map<String, Object> map = (Map<String,Object>) it.next();
	            Set<Entry<String, Object>> entrySet = map.entrySet();
	            for (Entry<String, Object> entry : entrySet) {
	                //do something...................
	            }
	        }

	    }
	
}
建议你好好掌握下j2se基础，比如集合，异常，io,多线程这些基础，基础掌握了，这个问题有很多种做法，而且每种做法的性能也不一样。


http://www.happyalaric.com  alaric 个人技术博客站欢迎你浏览。