PONG IN JAVA (CLASS/HOME)

import javax.swing.JFrame;
import java.awt.Color;
import java.awt.Graphics;

public class Pong extends JFrame
{
        private static final int WIDTH = 400;
        private static final int HEIGHT = 400;

        Ball b = new Ball();
        Paddle p1 = new Paddle();
        Paddle p2 = new Paddle();

        protected int x;
        protected int y;


        public Pong()
        {
                b.setSize(30, 30);
                b.setColor(Color.BLUE);
                b.setX(20);
                b.setY(20);

                p1.setSize(40, 40);
                p1.setColor(Color.RED);
                p1.setX(50);
                p1.setY(50);

                p2.setSize(40, 40);
                p2.setColor(Color.RED);
                p2.setX(100);
                p2.setY(100);

                add(b);
                add(p1);
                add(p2);
                getContentPane().repaint();
        }


        public void paint(Graphics g)
        {

        }

        public void setColor(Color c)
        {

        }

        public boolean collides(boolean a)
        {
                return a;
        }

        public void setSize(int width, int height)
        {

        }

        /*public void setX(int i)
        {
                x = i;
        }

        public void setY(int i)
        {
                y = i;
        }

        public int getX()
        {
                return x;
        }

        public int getY()
        {
                return y;
        }*/

        public static void main(String args[])
        {
                Pong frame = new Pong();

                frame.setSize(WIDTH, HEIGHT);
                frame.setTitle("Pong");
                frame.setResizable(false);
                frame.setVisible(true);
                frame.setLocationRelativeTo(null);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
}
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import java.awt.Color;
import java.awt.Graphics;

public class Ball extends Pong
{
        public Ball()
        {
                /*
                b.setSize(30, 30);
                b.setColor(Color.BLUE);
                b.setX(20);
                b.setY(20);
                */
        }

        public void paint(Graphics g)
        {

        }

        public void setColor(Color c)
        {

        }

        public void setSize(int width, int height)
        {

        }

        public void setX(int i)
        {
                x = i;
        }

        public void setY(int i)
        {
                y = i;
        }

        public int getX()
        {
                return x;
        }

        public int getY()
        {
                return y;
        }
}

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import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.*;

public class Paddle extends Pong implements KeyListener
{
        public Paddle()
        {
                /*
                p1.setColor(Color.RED);
                p1.setX(50);
                p1.setY(50);

                p2.setSize(40, 40);
                p2.setColor(Color.RED);
                p2.setX(100);
                p2.setY(100);
                */
        }

        public void paint(Graphics g)
        {

        }

        public void setColor(Color c)
        {

        }

        public void setSize(int width, int height)
        {

        }

        public void setX(int i)
        {
                x = i;
        }

        public void setY(int i)
        {
                y = i;
        }

        public int getX()
        {
                return x;
        }

        public int getY()
        {
                return y;
        }

        public void keyPressed(KeyEvent e)
        {

        }

        public void keyReleased(KeyEvent e)
        {

        }

        public void keyTyped(KeyEvent e)
        {

        }

}