java学习笔记五（随机数无重复）

package com0000;

//不存在 相同数
public class Demo {
    public static void main(String[] args) {
        int[] a = new int[6];
        for (int i = 0; i < a.length; i++) {
            int b = (int) (Math.random() * 30) + 1;
            a[i] = b;
            for (int j = 0; j < i; j++) {
                if (a[i] == a[j]) {
                    i--;
                    break;
                }
            }

        }
        for (int j = 0; j < a.length; j++) {
            System.out.print(a[j] + " ");
        }
    }
}