Map存放不同数据或对象

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import java.util.HashMap; import java.util.Iterator; import java.util.Map.Entry;       public class Demo {     public static void main(String[] args) {         HashMap<Object,Object> map = new HashMap<Object,Object>();         map.put(1,"三国");//值是字符串         map.put("数组",new int[]{1,2,3});//值是数组         map.put(null, null);//值是null         map.put(map,map);//值是map自己         map.put('A',2.8 );//值是浮点数                    Iterator<Entry<Object,Object>> it = map.entrySet().iterator();         while(it.hasNext()){             Entry<Object,Object> e = it.next();             System.out.println(e.getKey()+","+e.getValue());         }     } }