2 boolean check aren't compatible

Question

Trying to create a method that will make an array and assign different numbers from 1 - 9 to each index of the array (nos. cannot be repeated). please have a look at the boolean comparison i made, this is where the cmd stuck at runtime. I have tried to separate the two but nothing happens.

Please help.

import java.util.ArrayList;

class Testing {

public static void main (String[] args) {

  ArrayList<Integer> grid = new ArrayList<Integer>();

     int randNum;
     int count = 0;
     int size=8;

     for (int b = 0; b <=size; b++) { 

       while (count <= size) {

        randNum = (int) (Math.random() * 9);


           if (grid.contains(randNum) == false & randNum != 0 ) { 

            grid.add(randNum);
            count++;

          }
       }
     System.out.println(grid.get(b)); 
    }
   System.out.println("size: " + grid.size());
  }
 }

Answer 1

Why not use a Fisher-Yates shuffle instead?

That is, fill the array with 1-9 and then Collections.shuffle() it.

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Aside: use && not & in your original code.