Java--Map的学习

Map的迭代输出

 1 package test;
 2 import java.util.Collection;
 3 import java.util.HashMap;
 4 import java.util.Iterator;
 5 import java.util.Map;
 6 import java.util.Set;
 7 public class Test
 8 {
 9     public static void main(String[] args) throws Exception
10     {
11         Map<String,String> map = new HashMap();
12         map.put("hello", "world");
13         map.put("hello1", "world1");
14         map.put("hello2", "world2");
15         map.put("hello3", "world3");
16         map.put("hello4", "world4");
17         String str = map.get("hello");
18         boolean containsKey = map.containsKey("hello");
19         boolean containsValue = map.containsValue("world");
20         Set<String> keySet = map.keySet();
21         Collection<String> values = map.values();
22 
23         Iterator<String> iter = values.iterator();
24         while(iter.hasNext()){
25             String s = iter.next();
26             System.out.println(s+"E");
27         }
28         
29     }
30 }

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