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Draw rectangle in JFrame

Source code below will show how to draw rectangle in JFrame.

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

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

public class DrawRectangleInJFrame extends JFrame
{
public DrawRectangleInJFrame()
{
//Set JFrame title
super("Draw A Rectangle 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 rectangle outline
g.drawRect(50,50,300,100);

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

//fill rectangle with RED
g.fillRect(50,50,300,100);
}

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


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JUST COMPILE AND EXECUTE IT
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