如何创建不相等的随机整型常量

import java.util.*;
public class TestRandom
{
    public static void main(String[] args) {
        Random ran = new Random();
        int a[] = new int[10];
        int b[] = new int[10];
        int c[] = new int[10];
        int d[] = new int[10];

        boolean flag;
        do
        {
            flag = false;
            a[1] = ran.nextInt(9)+1;
            b[0] = ran.nextInt(9)+1;
   
        a[0] = a[1] + 2;
        a[2] = a[1] + 1;
        a[3] = a[1] + 2;
        a[4] = a[1] + 3;
        a[5] = a[1] + 4;
        a[6] = a[1] + 2;
        a[7] = a[1] + 1;
        a[8] = a[1] + 2;
        a[9] = a[1] + 3;

        b[1] = b[0] + 1;
        b[2] = b[0] + 1;
        b[3] = b[0] + 1;
        b[4] = b[0] + 1;
        b[5] = b[0] + 1;
        b[6] = b[0] + 2;
        b[7] = b[0] + 3;
        b[8] = b[0] + 3;
        b[9] = b[0] + 3;

        c[0] = a[0] * 10 + b[0];
        c[1] = a[1] * 10 + b[1];
        c[2] = a[2] * 10 + b[2];
        c[3] = a[3] * 10 + b[3];
        c[4] = a[4] * 10 + b[4];
        c[5] = a[5] * 10 + b[5];
        c[6] = a[6] * 10 + b[6];
        c[7] = a[7] * 10 + b[7];
        c[8] = a[8] * 10 + b[8];   
        c[9] = a[9] * 10 + b[9];

        d[0] = b[0] * 10 + a[0];
        d[1] = b[1] * 10 + a[1];
        d[2] = b[2] * 10 + a[2];
        d[3] = b[3] * 10 + a[3];
        d[4] = b[4] * 10 + a[4];
        d[5] = b[5] * 10 + a[5];
        d[6] = b[6] * 10 + a[6];
        d[7] = b[7] * 10 + a[7];
        d[8] = b[8] * 10 + a[8];
        d[9] = b[9] * 10 + a[9];
        for (int x : c)
        {
            for (int y : d )
           
                if (x==y)
                {
                    flag = true;
                }
        }
   
        } while (flag);
        System.out.println("---a---");
        for (int x : a)
        {
            System.out.println(x);
        }
        System.out.println("---b---");
        for (int x : b )
        {
            System.out.println(x);
        }
        System.out.println("---c---");
        for (int x : c )
        {
            System.out.println(x);
        }
        System.out.println("---d---");
        for (int x : d )
        {
            System.out.println(x);
        }
    }
}