java遍历Map对象的说有数据

JDK1.4中

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    <FONT color=#0000ff>Map map = new HashMap(); 

        Iterator it = map.entrySet().iterator();  
        while (it.hasNext()) { 
            Map.Entry entry = (Map.Entry) it.next(); 
            Object key = entry.getKey(); 
            Object value = entry.getValue(); 
    }</FONT> 


    Map map = new HashMap();  
        Iterator it = map.entrySet().iterator(); 
        while (it.hasNext()) { 
            Map.Entry entry = (Map.Entry) it.next(); 
            Object key = entry.getKey(); 
            Object value = entry.getValue(); 
    }JDK1.5中,应用新特性For-Each循环 

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    Map m = new HashMap(); 
    for(Object o : map.keySet()){ 
        map.get(o); 
    } 
    Map m = new HashMap(); 
    for(Object o : map.keySet()){  
        map.get(o); 

    }返回的 set 中的每个元素都是一个 Map.Entry 类型。 



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    <FONT color=#0000ff>private Hashtable<String, String> emails = new Hashtable<String, String>();</FONT> 



    private Hashtable<String, String> emails = new Hashtable<String, String>();  另外 我们可以先把hashMap 转为集合Collection，再迭代输出，不过得到的对象 




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     <FONT color=#0000ff>//方法一: 用entrySet() 

       Iterator it = emails.entrySet().iterator();  

       while(it.hasNext()){ 

        Map.Entry m=(Map.Entry)it.next(); 



        logger.info("email-" + m.getKey() + ":" + m.getValue());