java随机打乱list

public class test {

public static void main(String[] args) {

List<Integer> list = new ArrayList<Integer>();

Random random=new Random();

for (int i = 0; i < 15; i++)

{

int n=random.nextInt(15);//产生随机数

list.add(new Integer(n));

}

System.out.println("打乱前顺序为:");

System.out.println(list);

for (int i = 0; i < 3; i++) {

System.out.println("第" + i + "次打乱：");

Collections.shuffle(list);

System.out.println(list);

}

}

}

结果：

打乱前顺序为:

[9, 3, 14, 5, 2, 0, 0, 3, 12, 4, 13, 4, 11, 2, 3]

第0次打乱：

[12, 9, 2, 11, 0, 3, 5, 0, 2, 3, 14, 3, 13, 4, 4]

第1次打乱：

[4, 9, 14, 5, 4, 2, 0, 13, 11, 2, 3, 3, 12, 3, 0]

第2次打乱：

[4, 13, 0, 5, 9, 14, 2, 0, 3, 3, 12, 2, 3, 11, 4]