Draw square in JFrame

Source code below will show you, how to draw a square in a JFrame. For your information, square has 4 equal side. It mean it has 4 side with same length.

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

import java.awt.Graphics;
import java.awt.Color;

public class DrawSquareInJFrame extends JFrame
{
public DrawSquareInJFrame()
{
 //Set JFrame title
 super("Draw A Square In JFrame");

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

 //Set JFrame size
 setSize(400,400);

 //Make JFrame visible 
 setVisible(true);
}

public void paint(Graphics g)
{
 super.paint(g);

 //draw square outline
 g.drawRect(50,50,100,100);

 //set color to RED
 //So after this, if you draw anything, all of it's result will be RED
 g.setColor(Color.RED);

 //fill square with RED
 g.fillRect(50,50,100,100);
}

public static void main(String[]args)
{
 DrawSquareInJFrame dlijf=new DrawSquareInJFrame();
}
}

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JUST COMPILE AND EXECUTE IT
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