hashMap的三种输出方法:

//Iterator<Entry<Integer,Person>> result = tmpHash.entrySet().iterator();
        //1.通过Entry来遍历HashMap
        for(Entry<Integer,Person> result:tmpHash.entrySet())
        {
            System.out.println("key="+result.getKey()+"value="+result.getValue());
        }

 for(Integer key:tmpHash.keySet())
        {
            System.out.println("key="+key+"value="+tmpHash.get(key));
        }

Iterator<Entry<Integer, Person>> it = tmpHash.entrySet().iterator();  
          while (it.hasNext()) {  
           Entry<Integer, Person> entry = it.next();  
           System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());  
          }