java中遍历MAP方法

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Java代码
  1. Map<String,String> map=new HashMap<String,String>();   map.put("username", "qq");   map.put("passWord", "123");   map.put("userID", "1");   map.put("email", "qq@qq.com");  

    第一种用for循环 
    Java代码

    1. for(Map.Entry<String, String> entry:map.entrySet()){        System.out.println(entry.getKey()+"--->"+entry.getValue());   }  


  2. 第二种用迭代 
    Java代码

  3. Set set = map.entrySet();        Iterator i = set.iterator();        while(i.hasNext()){          Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next();        System.out.println(entry1.getKey()+"=="+entry1.getValue());   }  

    用keySet()迭代 
    Java代码

Iterator it=map.keySet().iterator();   while(it.hasNext()){        String key;        String value;        key=it.next().toString();        value=map.get(key);        System.out.println(key+"--"+value);   }  

用entrySet()迭代 
Java代码

Iterator it=map.entrySet().iterator();          System.out.println( map.entrySet().size());   String key;          String value;   while(it.hasNext()){           Map.Entry entry = (Map.Entry)it.next();                  key=entry.getKey().toString();                  value=entry.getValue().toString();                  System.out.println(key+"===="+value);                    }  


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