1 package collection;
 2 
 3 /**
 4  * 寵物類
 5  * @author 
 6  *
 7  */
 8 public class Pet {
 9     private String name;
10     private String sex;
11     
12     public Pet() {
13     }
14     
15     public Pet(String name, String sex) {
16         this.name = name;
17         this.sex = sex;
18     }
 
19 
20     public String getName() {
21         return name;
22     }
23     public void setName(String name) {
24         this.name = name;
25     }
26     public String getSex() {
27         return sex;
28     }
29     public void setSex(String sex) {
30         this.sex = sex;
31     }
32 
33 }

 1
 
 package collection;
 2 
 3 import java.util.HashMap;
 4 import java.util.Iterator;
 5 import java.util.Map;
 6 import java.util.Set;
 7 
 8 public class test4 {
 9 
10     public static void main(String[] args) {
11         Map<String,String> p=new HashMap<String,String>();
12         p.put("歐歐","Q仔");
 
13         p.put("亞亞","Q妹");
14         p.put("菲菲","Q妹");
15         p.put("美美","Q妹");
16         
17         System.out.println("使用Iteror遍歷，所有企鵝的暱稱和品種是：");
18         Set<String> keys=p.keySet();
19         //使用Iterator迭代器拿到每個key
20         Iterator<String> itor=keys.iterator();
21         while(itor.hasNext()) {
22             String key=itor.next();
23             String value=p.get(key);  //根據key拿到value
24             System.out.println(key+"\t"+value);
25         }
26         
27         System.out.println("使用foreach語句遍歷，所有企鵝的暱稱和品種分別是：");
28         for (String key : keys) {
29             String value=p.get(key);
30             System.out.println(key+"\t"+value);
31         }
32     }
33 
34 }