Write a program in Java to demonstrate Keyboard events
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class keyevent {
    public static void main(String arg[]) {
        sf f=new sf();
        f.setDefaultCloseOperation(3);
        f.show();
    }
}
class sf extends JFrame {
    sf() {
        setSize(600,600);
        setTitle("Key Test");
        addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                Graphics g=getGraphics();
                int keyCode = e.getKeyCode();
                if(keyCode == KeyEvent.VK_L) {
                    g.drawLine(20,20,80,80);
                }
                if(keyCode == KeyEvent.VK_R) {
                    g.drawRect(30,30,80,80);
                }
                if(keyCode == KeyEvent.VK_O) {
                    g.drawOval(40,40,80,80);
                }
                if(keyCode == KeyEvent.VK_C) {
                    g.drawOval(35,35,80,80);
                }
            }
        });
    }
}