import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.List;


public class KeyListenerTutorial
extends Applet
implements KeyListener{

    private Rectangle rect;

    private ArrayList<Integer> keysDown;

    public void init()
    {
        this.addKeyListener(this);

        keysDown = new ArrayList<Integer>();
        rect = new Rectangle(0, 0, 50, 50);
    }

    public void paint(Graphics g)
    {
        setSize(500, 500);
        Graphics2D g2 = (Graphics2D)g;

        g2.fill(rect);
    }

    @Override
    public void keyPressed(KeyEvent e) {
        if (!keysDown.contains(e.getKeyCode()))
            keysDown.add(new Integer(e.getKeyCode()));

        moveRect();

        /*
        if (e.getKeyCode() == KeyEvent.VK_RIGHT)
        {
            rect.setLocation(rect.x + 2, rect.y);
        }
         if (e.getKeyCode() == KeyEvent.VK_LEFT)
        {
            rect.setLocation(rect.x - 2, rect.y);
        }
         if (e.getKeyCode() == KeyEvent.VK_UP)
        {
            rect.setLocation(rect.x, rect.y - 2);
        }
         if (e.getKeyCode() == KeyEvent.VK_DOWN)
        {
            rect.setLocation(rect.x, rect.y + 2);
        }
*/


    }

    @Override
    public void keyReleased(KeyEvent e) {
        keysDown.remove(new Integer(e.getKeyCode()));



    }

    public void moveRect()
    {
        int x = rect.x;
        int y = rect.y;

        if (keysDown.contains(KeyEvent.VK_UP))
            y -= 2;

        if (keysDown.contains(KeyEvent.VK_DOWN))
            y += 2;

        if (keysDown.contains(KeyEvent.VK_LEFT))
            x -= 2;

        if (keysDown.contains(KeyEvent.VK_RIGHT))
            x += 2;

        rect.setLocation(x,y);

        repaint();


    }

    @Override
    public void keyTyped(KeyEvent e) {


    }



}