Map.EntrySet的使用方法

1.package edu.smc.test;  
2.  
3.import java.util.HashMap;  
4.import java.util.Iterator; 
5.import java.util.Map;  
6.import java.util.Map.Entry; 
7.  
8.public class TestEntrySet {  
9.    public static void main(String[] args) { 
10.        Map<String,String> map=new HashMap<String,String>();  
11.        map.put("1", "张三");  
12.        map.put("2", "李四");  
13.        map.put("3", "王五");  
14.        /*方法一 ：迭代程序*/  
15.        System.out.println("方法一：");  
16.        Iterator iterator=map.entrySet().iterator();  
17.        while(iterator.hasNext()){        
18.           Map.Entry<String, String> entry= (Entry<String, String>) iterator.next();  
19.           System.out.println("key:"+entry.getKey()+" value"+entry.getValue());    
20.          }         
21.        /*方法二*/  
22.        System.out.println("方法二：");  
23.        for (Map.Entry<String, String> m : map.entrySet()) {  
24.              System.out.println("key:"+m.getKey()+" value"+m.getValue());  
25.          }   
26.      }  
27.}  
package edu.smc.test;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

public class TestEntrySet {
	public static void main(String[] args) {
		Map<String,String> map=new HashMap<String,String>();
		map.put("1", "张三");
		map.put("2", "李四");
		map.put("3", "王五");
		/*方法一 ：迭代程序*/
		System.out.println("方法一：");
		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());  
		  }       
        /*方法二*/
        System.out.println("方法二：");
        for (Map.Entry<String, String> m : map.entrySet()) {
        	  System.out.println("key:"+m.getKey()+" value"+m.getValue());
          } 
      }
}
结果：



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1.方法一：  
2.key:3 value王五  
3.key:2 value李四  
4.key:1 value张三  
5.方法二：  
6.key:3 value王五  
7.key:2 value李四  
8.key:1 value张三