随机打乱一个数组，无重复的获取一定范围内的随机数

package Num1_2_02;import java.util.Random;/** * 随机打乱一个数组，无重复获取随机数 *  * @author he * */public class Suffle {private static Random random = new Random(System.currentTimeMillis());public static void suffle(int a[]) {if (a == null) {throw new RuntimeException();}int N = a.length;for (int i = 0; i < N; i++) {int t = i + random.nextInt(N - i);// 保证了t不重复// 交换元素int temp = a[i];a[i] = a[t];a[t] = temp;}}public static void show(int a[]) {for (int i = 0; i < a.length; i++) {System.out.print(a[i] + " ");}}public static void main(String[] args) {int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };suffle(a);show(a);}}

看代码吧