《Map》

↓↓↓↓↓↓↓

 1 import java.util.HashMap;
 2 import java.util.Iterator;
 3 import java.util.Map;
 4 import java.util.Set;
 5 
 6 public class MapDemo {
 7 
 8     public static void main(String[] args) {
 9         Map<String, String> m=new HashMap<String, String>();
10         m.put("1", "张三");
11         m.put("2", "lisi");
12         m.put("3", "wangwu");
13         System.out.println(m);
14         
15         Set<String> s=m.keySet();
16         Iterator<String> it=s.iterator();
17         while(it.hasNext()){
18             String key=it.next();
19             String value=m.get(key);
20             System.out.println("key:"+key+"      "+"value:"+value);
21         }
22     }
23 }

↓↓↓↓↓↓↓

 1 import java.util.HashMap;
 2 import java.util.Iterator;
 3 import java.util.Map;
 4 import java.util.Set;
 5 
 6 public class MapDemo {
 7 
 8     public static void main(String[] args) {
 9         Map<String, String> m=new HashMap<String, String>();
10         m.put("1", "张三");
11         m.put("2", "lisi");
12         m.put("3", "wangwu");
13         System.out.println(m);
14         
15 //        Set<String> s=m.keySet();
16 //        Iterator<String> it=s.iterator();
17 //        while(it.hasNext()){
18 //            String key=it.next();
19 //            String value=m.get(key);
20 //            System.out.println("key:"+key+"      "+"value:"+value);
21 //        }
22         Set<Map.Entry<String, String>> s=m.entrySet();
23         Iterator<Map.Entry<String,String>> it=s.iterator();
24         while(it.hasNext()){
25             Map.Entry<String, String> ma=it.next();
26             String key=ma.getKey();
27             String value=ma.getValue();
28             System.out.println("key:"+key+"      "+"value:"+value);
29         }
30     }
31 }

 

posted on 2015-12-10 11:53  System.out.print()  阅读(362)  评论(0)  编辑  收藏  举报

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