Java代码  

Map
     
       map=new HashMap
      
       ();      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  

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

 

第二种用迭代

Java代码  

Set set = map.entrySet();           Iterator i = set.iterator();           while(i.hasNext()){            Map.Entry
      
        entry1=(Map.Entry
       
        )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);                           }  　　  for (Map.Entry
     
       entry : map.entrySet()) {        　　System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());  　　 }