Java 4k game Programming Contest

package com.psinfo.pspong;

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;

public class PSPong extends JFrame implements ActionListener, KeyListener, ItemListener {

	private static final long serialVersionUID = 1l;
	private JPanel stadiun, playOne, playTwo, ball;
	private JComboBox jcbSpeed;
	private JLabel result;
	private Timer timer = new Timer( 30, this );
	private boolean left, rigth, up, down;
	private List&lt Integer &gt speeds = new ArrayList&lt Integer &gt();
	private final int PLAYERUP = 0, PLAYERDOWN = 1, ONEPLAYER = 1, TWOPLAYER = 2;
	private int sizePlayers = ONEPLAYER, SCOREPLAYONE = 0, SCOREPLAYTWO = 0;

	public PSPong() {
		super( "PSPong" );
		setSize( 398, 357 );
		setResizable( false );
		setLocationRelativeTo( this );
		setDefaultCloseOperation( DISPOSE_ON_CLOSE );
		initComponents();
		addKeyListener( this );
		setVisible( true );
		stadiun.requestFocus();
	}

	private void initComponents() {
		speeds.add( 2 );
		speeds.add( 4 );
		speeds.add( 8 );
		speeds.add( 12 );
		speeds.add( 20 );
		JMenuBar bar = new JMenuBar();
		setJMenuBar( bar );
		JMenu mFile = new JMenu( "File" ), mHelp = new JMenu( "Help" );
		JRadioButtonMenuItem rbmiOnePlayer = new JRadioButtonMenuItem( "One player", true ), rbmiTwoPlayer = new JRadioButtonMenuItem( "Two player" );
		JMenuItem miExit = new JMenuItem( "exit" ), miHelp = new JMenuItem( "help" ), miAbout = new JMenuItem( "about" );
		bar.add( mFile );
		mFile.add( rbmiOnePlayer );
		mFile.add( rbmiTwoPlayer );
		mFile.addSeparator();
		mFile.add( miExit );
		bar.add( mHelp );
		mHelp.add( miHelp );
		mHelp.addSeparator();
		mHelp.add( miAbout );
		rbmiOnePlayer.addActionListener( this );
		rbmiTwoPlayer.addActionListener( this );
		miExit.addActionListener( this );
		miHelp.addActionListener( this );
		miAbout.addActionListener( this );
		ButtonGroup bg = new ButtonGroup();
		bg.add( rbmiOnePlayer );
		bg.add( rbmiTwoPlayer );
		getContentPane().setLayout( new BorderLayout() );
		JPanel jp = new JPanel();
		jp.setLayout( new BorderLayout() );
		jp.setPreferredSize( new Dimension( 390, 20 ) );
		result = new JLabel( " play two    X    play one" );
		jp.add( result, BorderLayout.WEST );
		jp.add( new JLabel( "speed : ", SwingConstants.RIGHT ), BorderLayout.CENTER );
		jcbSpeed = new JComboBox( new String[] { "1", "2", "3", "4", "5" } );
		jcbSpeed.setPreferredSize( new Dimension( 50, 20 ) );
		jp.add( jcbSpeed, BorderLayout.EAST );
		jcbSpeed.setSelectedIndex( 2 );
		jcbSpeed.addItemListener( this );
		getContentPane().add( jp, BorderLayout.NORTH );
		stadiun = new JPanel();
		stadiun.setLayout( null );
		stadiun.setSize( 390, 280 );
		stadiun.setPreferredSize( new Dimension( 390, 280 ) );
		stadiun.setBackground( new Color( 100, 150, 100 ) );
		playOne = new JPanel();
		playOne.setLayout( null );
		playOne.setSize( 10, 40 );
		playOne.setBackground( Color.ORANGE );
		playTwo = new JPanel();
		playTwo.setLayout( null );
		playTwo.setSize( 10, 40 );
		playTwo.setBackground( Color.ORANGE );
		ball = new JPanel();
		ball.setLayout( null );
		ball.setSize( 10, 10 );
		getContentPane().add( stadiun, BorderLayout.CENTER );
		ball.setLocation( ( stadiun.getPreferredSize().width / 2 ) - 5, ( stadiun.getPreferredSize().height / 2 ) - 5 );
		stadiun.add( ball );
		playTwo.setLocation( 5, ( stadiun.getPreferredSize().height / 2 ) - 20 );
		stadiun.add( playTwo );
		playOne.setLocation( 375, ( stadiun.getPreferredSize().height / 2 ) - 20 );
		stadiun.add( playOne );
		stadiun.addKeyListener( this );
		ball.addKeyListener( this );
		playOne.addKeyListener( this );
		playTwo.addKeyListener( this );
	}

	private void newGame() {
		int vert = (int) Math.random() * 21, hor = (int) Math.random() * 21;
		if ( vert % 2 == 0 ) {
			rigth = true;
			left = false;
		}
		else {
			left = true;
			rigth = false;
		}
		if ( hor % 2 == 0 ) {
			up = true;
			down = false;
		}
		else {
			down = true;
			up = false;
		}
		SCOREPLAYONE = 0;
		SCOREPLAYTWO = 0;
		viewResult();
		if ( timer.isRunning() ) {
			timer.stop();
		}
		timer.start();
	}

	private void pauseGame() {
		if ( timer.isRunning() ) {
			timer.stop();
		}
		else {
			timer.start();
		}
	}

	private void stopGame() {
		SCOREPLAYONE = 0;
		SCOREPLAYTWO = 0;
		if ( timer.isRunning() ) {
			timer.stop();
		}
		ball.setLocation( ( stadiun.getPreferredSize().width / 2 ) - 5, ( stadiun.getPreferredSize().height / 2 ) - 5 );
		playTwo.setLocation( 5, ( stadiun.getPreferredSize().height / 2 ) - 20 );
		playOne.setLocation( 375, ( stadiun.getPreferredSize().height / 2 ) - 20 );
	}

	private void movePlayerOne( int a ) {
		int x = playOne.getX(), y = playOne.getY(), speed = speeds.get( jcbSpeed.getSelectedIndex() &gt -1 ? jcbSpeed.getSelectedIndex() : 2 ) * 2;
		if ( a == PLAYERUP ) {
			if ( y &gt 0 ) {
				y -= speed;
			}
		}
		else if ( a == PLAYERDOWN ) {
			if ( y &lt 240 ) {
				y += speed;
			}
		}
		playOne.setLocation( x, y );
		playOne.repaint();
		stadiun.repaint();
	}

	private void movePlayerTwo( int a ) {
		int x = playTwo.getX(), y = playTwo.getY(), speed = speeds.get( jcbSpeed.getSelectedIndex() &gt -1 ? jcbSpeed.getSelectedIndex() : 2 );
		if ( sizePlayers == TWOPLAYER ) {
			speed = speed * 2;
		}
		else {
			speed++;
		}
		if ( a == PLAYERUP ) {
			if ( y &gt 0 ) {
				y -= speed;
			}
		}
		else if ( a == PLAYERDOWN ) {
			if ( y &lt 240 ) {
				y += speed;
			}
		}
		playTwo.setLocation( x, y );
		playTwo.repaint();
		stadiun.repaint();
	}

	private void moveBall() {
		int x = ball.getX(), y = ball.getY(), speed = speeds.get( jcbSpeed.getSelectedIndex() &gt -1 ? jcbSpeed.getSelectedIndex() : 2 );
		if ( left ) {
			if ( x &lt 15 ) {
				if ( ( y &lt ( playTwo.getY() - 10 ) ) || ( y &gt ( playTwo.getY() + 40 ) ) ) {
					SCOREPLAYONE++;
					viewResult();
				}
				left = false;
				rigth = true;
			}
			else {
				x -= speed;
			}
		}
		else if ( rigth ) {
			if ( x &gt 365 ) {
				if ( ( y &lt ( playOne.getY() - 10 ) ) || ( y &gt ( playOne.getY() + 40 ) ) ) {
					SCOREPLAYTWO++;
					viewResult();
				}
				left = true;
				rigth = false;
			}
			else {
				x += speed;
			}
		}
		if ( up ) {
			if ( y &lt 0 ) {
				up = false;
				down = true;
				y = 0;
			}
			else {
				y -= speed;
			}
		}
		else if ( down ) {
			if ( y &gt 260 ) {
				down = false;
				up = true;
				y = 260;
			}
			else {
				y += speed;
			}
		}
		if ( sizePlayers == ONEPLAYER ) {
			if ( up ) {
				movePlayerTwo( PLAYERUP );
			}
			else if ( down ) {
				movePlayerTwo( PLAYERDOWN );
			}
		}
		ball.setLocation( x, y );
		ball.repaint();
		stadiun.repaint();
	}

	private void viewResult() {
		result.setText( " play two " + SCOREPLAYTWO + "   X   " + SCOREPLAYONE + " play one" );
		if ( SCOREPLAYONE == 10 ) {
			stopGame();
			JOptionPane.showMessageDialog( this, "PLAYER ONE WINNER !!!" );
		}
		else if ( SCOREPLAYTWO == 10 ) {
			stopGame();
			JOptionPane.showMessageDialog( this, "PLAYER TWO WINNER !!!" );
		}
		else {
			pauseGame();
			ball.setLocation( ( stadiun.getPreferredSize().width / 2 ) - 5, ( stadiun.getPreferredSize().height / 2 ) - 5 );
			playTwo.setLocation( 5, ( stadiun.getPreferredSize().height / 2 ) - 20 );
			playOne.setLocation( 375, ( stadiun.getPreferredSize().height / 2 ) - 20 );
		}
	}

	public void actionPerformed( ActionEvent e ) {

		if ( "exit".equals( e.getActionCommand() ) ) {
			System.exit( 0 );
		}
		else if ( "help".equals( e.getActionCommand() ) ) {
			JOptionPane.showMessageDialog( this, "Player One\nmove up    -&gt key up\nmove down  -&gt key down\n\nPlayer Two\nmove up    -&gt key Q\nmove down  -&gt key A\n\nnew game   -&gt key N\npause/play -&gt key P\nstop       -&gt key X\n\n", "help", JOptionPane.QUESTION_MESSAGE );
		}
		else if ( "about".equals( e.getActionCommand() ) ) {
			JOptionPane.showMessageDialog( this, "PSPong\n\nby PS Info - pregospan\n(c) pregospan 2000 - 2007\n\[email removido]", "aboult", JOptionPane.PLAIN_MESSAGE );
		}
		else if ( "One player".equals( e.getActionCommand() ) ) {
			sizePlayers = ONEPLAYER;
		}
		else if ( "Two player".equals( e.getActionCommand() ) ) {
			sizePlayers = TWOPLAYER;
		}
		else if ( e.getSource() == timer ) {
			moveBall();
		}
	}

	public void keyPressed( KeyEvent e ) {
		if ( e.getKeyCode() == KeyEvent.VK_UP ) {
			movePlayerOne( PLAYERUP );
		}
		else if ( e.getKeyCode() == KeyEvent.VK_DOWN ) {
			movePlayerOne( PLAYERDOWN );
		}
		else if ( e.getKeyCode() == KeyEvent.VK_Q ) {
			if ( sizePlayers == TWOPLAYER ) {
				movePlayerTwo( PLAYERUP );
			}
		}
		else if ( e.getKeyCode() == KeyEvent.VK_A ) {
			if ( sizePlayers == TWOPLAYER ) {
				movePlayerTwo( PLAYERDOWN );
			}
		}
		else if ( e.getKeyCode() == KeyEvent.VK_N ) {
			newGame();
		}
		else if ( e.getKeyCode() == KeyEvent.VK_P ) {
			pauseGame();
		}
		else if ( e.getKeyCode() == KeyEvent.VK_X ) {
			stopGame();
		}
	}

	public void itemStateChanged( ItemEvent e ) {
		if ( e.getSource() == jcbSpeed ) {
			stadiun.requestFocus();
		}
	}

	public void keyReleased( KeyEvent e ) { }

	public void keyTyped( KeyEvent e ) { }

	public static void main( String[] args ) {

		new PSPong();
	}
}

...
 * To get this game to compress to under 4kb, I used proguard to obfuscate, and BJWFlate to pack.
 * The source code is kinda messy because of the nature of the project, but I've added plenty of comments.
...

public void processEvent(AWTEvent e)
    {
        switch (e.getID())
        {
            case WindowEvent.WINDOW_CLOSING:
                ...
                break;
            case MouseEvent.MOUSE_RELEASED:
                ...
                break;
            case MouseEvent.MOUSE_PRESSED:
                ...
                break;
            case KeyEvent.KEY_PRESSED:
                ....
                break;
        }
    }