1 import java.util.Collections;
2 import java.util.Iterator;
3 import java.util.List;
4 import java.util.ArrayList;
5 import java.util.Collection;
6
7 public class ImplementsDemo {
8 public static void main(String[] args) {
9 List<String> all=new ArrayList<String>();
10 Collections.addAll(all, "1,hjw","2,zk","3,ljd");
11 System.out.print("交换之前的集合：");
12 Iterator<String> iter=all.iterator();
13 while(iter.hasNext()){
14 System.out.print(iter.next()+" ");
15 }
16 Collections.swap(all, 0, 2);
17 iter=all.iterator();
18 System.out.print("\n交换之后的集合：");
19 while(iter.hasNext()){
20 System.out.print(iter.next()+" ");
21 }
22 }
23
24 }