Multi Dimensional Arrays and nextBoolean

[Julian Bailey]

Hi,
I'm trying to solve a problem and have come to the stage of tearing my hair out! Basically I want to create a java program that produces a console display like so.
x0xx0
0x00x
0xxx0
xxx00
0000x
The rows and columns must be randomly filled.
I believe that one needs to use a two dimensional array to achieve this problem and have come across/ modified the following code out of two java problems.
THIS PROGRAM BASICALLY PRINTS OUT AN ARRAY OF 5 x 5 numbers.

public class ArrayOfArraysDemo2 {
    public static void main(String[] args) {
        int[][] aMatrix = new int[5][5];
 
//populate matrix
        for (int i = 0; i < aMatrix.length; i++) {
    aMatrix[i] = new int[5];//create sub-array
    for (int j = 0; j < aMatrix[i].length; j++) {
        aMatrix[i][j] = i + j;
    }
        }
 
        //print matrix
        for (int i = 0; i < aMatrix.length; i++) {
    for (int j = 0; j < aMatrix[i].length; j++) {
        System.out.print((aMatrix[i][j] +1) + " ");
    }
    System.out.println();
        }
    }
}

THE NEXT PROGRAM I CAME ACROSS USES nextBoolean TO ASSIGN RANDOM LETTERS TO A GRID AND THEN REPEATS THE RANDOM GRID A NUMBER OF TIMES.

import java.util.Random;
 
class RandomValuesTrue {
   public static void main(String args[]) {
    
   Random r = new Random();
 
     int h = 0;
     while(h < 5){
      
         for(int i = 0; i < bVals.length; i++){
         for(int j = 0; j < bVals[i].length; j++){
         bVals[i][j] = i + j;
 }
      }
       
         for(int i = 0; i < bVals.length; i++){
         for(int j = 0; j < bVals[i].length;j++){
           
         System.out.println(r.nextBoolean() ? "1" : "0");
 }
      System.out.println(" ");
      h++;
      }
      }
      }
}

The RandomValuesTrue.java program is nearly what I want, regrettably it only prints out one column to the console.
Please, please, please can someone help me two work out how to generate a random grid using the code I've created in RandomValuesTrue and stop me from becoming prematurely bald?
Thanks for your help.
Julain
[ edited to preserve formatting using the [code] and [/code] UBB tags -ds ]
[ April 07, 2004: Message edited by: Dirk Schreckmann ]

[Eddie Vanda]

public class R5 {
  public static void main (String [] args) {
    for (int row = 0; row < 5; row++) {
      StringBuffer sb = new StringBuffer ();
      for (int col = 0; col < 5; col++) {
        if (Math.random () > 0.5)
          sb.append ('x');
        else
          sb.append ('0');
      }
      System.out.println (sb);
    }
  }
}

[Michael Dunn]

Another way, maybe.

class Testing
{
  public Testing()
  {
    String[] what = {"x","O"};
    for(int i = 0; i < 25; i++)
    {
      if(i % 5 == 0)System.out.println();
      System.out.print(what[(int)(Math.random()*2)]);
    }
    System.exit(0);
  }
  public static void main(String[] args){new Testing();}
}