TreeMap的entryset用法

import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import java.util.TreeMap;public class EntrySet {public static void main(String[] args){TreeMap<String,String> map=new TreeMap<String,String>();map.put("5","qwe");map.put("2", "asd");map.put("3", "zxcc");     Iterator iterator=map.entrySet().iterator();     while(iterator.hasNext()){     Map.Entry<String, String>  entry=(Entry<String, String>) iterator.next();     System.out.println("key:"+entry.getKey()+""+"value:"+entry.getValue());          }          for(Map.Entry<String, String> entry: map.entrySet()){     System.out.println("key:"+entry.getKey()+" "+"value:"+entry.getValue());     }          }}  

结果

key:2 value:asd
key:3 value:zxcc
key:5 value:qwe
key:2 value:asd
key:3 value:zxcc
key:5 value:qwe