Draw grid on JFrame (Java)

Complete source code below will show you, how to draw grid on a JFrame.

****************************************************************************
COMPLETE SOURCE CODE FOR : DrawGridOnJFrame.java
****************************************************************************
import javax.swing.JFrame;

import java.awt.Graphics;

public class DrawGridOnJFrame extends JFrame
{
//Constructor
public DrawGridOnJFrame()
{
 //Set JFrame title to ( Draw grid on JFrame )
 setTitle("Draw grid on JFrame");

 //Set JFrame size to :
 //Width : 400 pixels
 //Height : 400 pixels
 setSize(400,400);

 //Set JFrame default close operation
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //Make JFrame visible
 setVisible(true);
}


/**
 *To draw grid line on JFrame we will override it's paint method.
 *We will draw grid with size 10 pixels width and 10 pixels height for each grid box
 **/
public void paint(Graphics g)
{
 //Override paint method in superclass
 super.paint(g);

 //Get current JFrame width
 int frameWidth=getSize().width;

 //Get current JFrame height
 int frameHeight=getSize().height;

 int temp=0;

 //Draw vertical grid line with spacing between each line equal to 10 pixels
 while(temp<frameWidth)
 {
  temp=temp+10;
  g.drawLine(temp,0,temp,frameHeight);
 }

 temp=0;

 //Draw horizontal grid line with spacing between each line equal to 10 pixels
 while(temp<frameHeight)
 {
  temp=temp+10;
  g.drawLine(0,temp,frameWidth,temp);
 }
}

//Main method
public static void main(String[]args)
{
 DrawGridOnJFrame dgojf=new DrawGridOnJFrame();
}
}


****************************************************************************
JUST COMPILE AND EXECUTE IT
****************************************************************************