Java双色球随机生成

随机生成六个1-33的红球（不能重复）并排序，随机生成一个1-16的蓝球在最后可以重复；用户可以选择要的注数随机打印。

public class ShuZussq {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("选择你要的注数");
        int num = scan.nextInt();
        for (int n = 0; n < num; n++) {
            int[] shu = new int[7];
            int suiJi1 = (int) (Math.random() * 16 + 1);
            shu[6] = suiJi1;
            for (int i = 0; i < shu.length - 1; i++) {
                int suiJi = (int) (Math.random() * 33 + 1);
                shu[i] = suiJi;
                for (int j = 0; j < i; j++) {
                    if (shu[j] == shu[i]) {
                        i--;
                        break;
                    }else if (shu[j]>shu[i]){
                        int tmp=shu[j];
                        shu[j]=shu[i];
                        shu[i]=tmp;
                    }
                }
            }