Question

2 Write a Java program called Pattern that prints an 8-by-8 checker box pattern using an if loop.

Answer 1

Using Applet:

package demos;

import java.awt.*;
import java.applet.*;
  
// Extends Applet Class
public class Pattern1 extends Applet {
  
static int N = 10;
  
// Use paint() method
public void paint(Graphics g)
{
int x, y;
for (int row = 0; row < N; row++) {
  
for (int col = 0; col < N; col++) {
  
// Set x coordinates of rectangle
// by 20 times
x = row * 20;
  
// Set y coordinates of rectangle
// by 20 times
y = col * 20;
  
// Check whether row and column
// are in even position
// If it is true set Black color
if ((row % 2 == 0) == (col % 2 == 0))
g.setColor(Color.BLACK);
else
g.setColor(Color.WHITE);
  
// Create a rectangle with
// length and breadth of 20
g.fillRect(x, y, 20, 20);
}
}
}
}

Using console:

public class Pattern2 {
   public static void main(String args[]) {
       int i,j;
       for(i=0;i<8;i++) {
           for(j=0;j<8;j++) {
               if((i+j)%2==0)
                   System.out.print('*');
               else
                   System.out.print(' ');
           }
           System.out.println();
       }
   }
}

Hope this helps.