Acceleration

package controllers;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

import butka.Wait;
public class Acceleration extends Applet implements MouseListener, KeyListener{
    Image dbImage;
    Graphics dbg;
    private int x,y,mx,my,dx,dy,t,k=0;
    Toolkit tk=Toolkit.getDefaultToolkit();
    Image graphic = tk.getImage("C:\\Zopiac\\Graphics\\EggSprite.png");
    public void init(){this.setSize(800,600);addKeyListener(this);addMouseListener(this);}
    public void paint(Graphics g){
        Wait.mSec(50);
        this.setSize(800,600);
        g.drawString(x+"  "+y+"  "+t+"  "+k, 50, 50);
        t++;
        repaint();
        switch (k) {
        case 0://Null
            if(dx>0)dx--;
            if(dx<0)dx++;
            if(dy>0)dy--;
            if(dy<0)dy++;
            break;
        case 87://Up
            if (dy>-10)dy--;
            if(dx>0)dx--;
            if(dx<0)dx++;
            break;
        case 83://Down
            if (dy<10)dy++;
            if(dx>0)dx--;
            if(dx<0)dx++;
            break;
        case 65://Left
            if (dx>-10)dx--;
            if(dy>0)dy--;
            if(dy<0)dy++;
            break;
        case 68://Right
            if (dx<10)dx++;
            if(dy>0)dy--;
            if(dy<0)dy++;
            break;
        }
        x=x+dx;
        y=y+dy;
        g.drawImage(graphic, x, y, this);
    }
    public void update(Graphics g){
        if (dbImage == null){
            dbImage = createImage (800, 600);
            dbg = dbImage.getGraphics ();
        }
        dbg.setColor (getBackground ());
        dbg.fillRect (0, 0, 800, 600);
        dbg.setColor (getForeground());
        paint (dbg);
        g.drawImage (dbImage, 0, 0, this);
    }
    public void mouseMoved   (MouseEvent e) {}
    public void mouseClicked (MouseEvent e) {
        mx=e.getX();
        my=e.getY();
        repaint();
    }
    public void mouseEntered (MouseEvent e) {}
    public void mouseExited  (MouseEvent e) {}
    public void mousePressed (MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void keyPressed   (KeyEvent   e) {
        k=e.getKeyCode();
        repaint();
    }
    public void keyReleased  (KeyEvent   e) {
        k=0;
        repaint();
    }
    public void keyTyped     (KeyEvent   e) {}
}