import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class JFrameExample extends JFrame{
    
    public JFrameExample()        //Constructor
    {
        super("JFrameExample");    //Set title
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(400,400);    //Set size to 400 by 400
        setVisible(true);    //Make the JFrame visible
    }
    
    public void paint(Graphics g)    //This is where the painting is done
    {
        super.paintComponents(g);    //Paint components
        g.setColor(Color.GREEN);    //Change the color to green
        g.drawRect(10,50,100,100);    //Draw a rectangle
    }
    
    public static void main (String[] args){
        new JFrameExample();    //Create an instance of JFrameExample
    }
}