I am doing a 5 X 5 bingo card. Obviuosly, there are 5 rows and 5 columns. What I

Question

I am doing a 5 X 5 bingo card. Obviuosly, there are 5 rows and 5 columns. What I need is to have random, non-repeating numbers per column.

Column 1 should have random, non repeating numbers from 1-15.

Column 2 should have random, non repeating numbers from 16-30.

Column 3 should have random, non repeating numbers from 31-45

Column 4 should have random, non repeating numbers from 46-60

& Column 5 should have random, non repeating numbers from 61-75.

I know how to do the grid, however, my main issue is creating random, non-repeating numbers per column. Any help will be greatly appreciated!

Explanation / Answer

Code in Java

import java.util.Random;

public class Bingo
{
    Random randNum = new Random();
    int[][] card_num = new int[5][5];
    boolean[][] shadow = new boolean[5][5];

    public Bingo()
    {
    for(int i = 0; i < card_num.length; i++)
    {
        this.card_num[i][0] = randInt(1, 15);
        while(this.card_num[i][0] != card_num[i][0])
        {
            i++;
        }
        if(this.card_num[i][0] == card_num[i][0])
        {
            card_num[i][0] = randInt(1, 15);
        }
    }

    for(int j = 0; j < card_num.length; j++)
    {
        card_num[j][1] = randInt(16, 30);
    }
  
    for(int k = 0; k < card_num.length; k++)
    {
        card_num[k][2] = randInt(31, 45);
        card_num[2][2] = 0;
     
    }
    
    for(int m = 0; m < card_num.length; m++)
    {
        card_num[m][3] = randInt(46, 60);
     
    }
  
    for(int n = 0; n < card_num.length; n++)
    {
        card_num[n][4] = randInt(61, 75);
     

    }

    for(int i = 0; i < shadow.length; i++)
    {
        for(int j = 0; j < 5; j++)
        {
            shadow[i][j] = false;
            shadow[2][2] = true;
        }
    }

    }

private int randInt(int min, int max)
{
    int random;
    random = randNum.nextInt(max - min) + min;
    return random;
}

public String Print_Card()
{
    String string = "";
    for(int row = 0; row < card_num.length; row++)
    {
        for(int col = 0; col < card_num[row].length; col++)
        {
            System.out.print(card_num[row][col] + " ");
        }
        System.out.println();
    }
    return string;
}

    public static void main(String[] args)
    {
        Bingo bc = new Bingo();
        bc.Print_Card();

    }

}

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