suffer

 就是随机打乱原来的顺序，和洗牌一样。如：
1 // ShuffleTest.java
 2  
 3 import java.util.*;
 4  
 5 public class ShuffleTest {
 6     public static void main(String[] args) {
 7         List<Integer> list = new ArrayList<Integer>();
 8         for (int i = 0; i < 10; i++)
 9             list.add(new Integer(i));
10         System.out.println("打乱前:");
11         System.out.println(list);
12  
13         for (int i = 0; i < 5; i++) {
14             System.out.println("第" + i + "次打乱：");
15             Collections.shuffle(list);
16             System.out.println(list);
17         }
18     }
19 }