java 使用数组生成不重复的随机数
public class TestRandom { public static void main(String[] args) { //定义一个数组存放需要随机的数 int[] ints = new int[33]; for (int i = 0; i < ints.length; i++) { ints[i] = i; } //定义一个存放随机到的数的数组 int[] newints = new int[6]; //同时定义一个数组用来监控数据是否已经被随机到，达到去重的效果 boolean[] bs = new boolean[ints.length]; Random random=new Random(); int j; for (int i = 0; i < newints.length; i++) { do { j = random.nextInt(ints.length); } while (bs[j]); bs[j] = true; //用来标识随机到的数据是否已经存在 newints[i]=ints[j]; } System.out.println(Arrays.toString(newints)); } }
//随机生成n位不重复的随机数 int n =12; Set set = new HashSet(); Random random=new Random(); do { set.add(random.nextInt(33)); } while (set.size()<n); System.out.println(set.size()); System.out.println(set);
