1 package test_20_3;
 2 
 3 import java.util.Iterator;
 4 
 5 class ArrayListTest {
 6     
 7     protected String[] strArr = {"1", "2", "3", "4", "5", "6"};
 8 
 9 }
10 
11 public class CollectionAndIteratorTest extends ArrayListTest {
12     
13     // 生成Iterator是将队列与消费队列的方法连接在一起耦合度最小的方式
14     // 并且与实现Collection相比，它在序列类上所施加的约束也少得多
15     public Iterator<String> iterator(){
16         
17         return new Iterator<String>() {
18             
19             private int index = 0;
20 
21             @Override
22             public boolean hasNext() {
23                 return index < strArr.length;
24             }
25 
26             @Override
27             public String next() {
28                 return strArr[index++];
29             }
30             
31             @Override
32             public void remove() {
33                 throw new UnsupportedOperationException();
34             }
35             
36         };
37     }
38     
39     public static void display(Iterator<String> it) {
40         while (it.hasNext()) {
41             System.out.println(it.next());
42         }
43     }
44 
45     public static void main(String[] args) {
46 
47         CollectionAndIteratorTest cai = new CollectionAndIteratorTest();
48         display(cai.iterator());
49     }
50 }