import java.awt.event.*;
public class Controller implements KeyListener
{
	private Rooster rooster;
	private View view;

	public Controller(Rooster r, View v)
	{
		rooster = r;
		view = v;
		view.addKeyListener(this);
	}

	public void keyPressed(KeyEvent e) {
		switch (e.getKeyCode()){
		case KeyEvent.VK_RIGHT :
			rooster.rechts(rooster.getBreedte());
			view.repaint();
			break;
		case KeyEvent.VK_LEFT :
			rooster.links();
			view.repaint();
			break;
		}
	}

	public void keyReleased(KeyEvent e) {}
	public void keyTyped(KeyEvent e) {}
}


public class Rooster {

	private Speler speler;
	private int hoogte;
	private int breedte;
	int x, y;

	public Rooster()
	{
       breedte = 20;
       hoogte = 10;
       start();
    }

	public void start() {
		speler = new Speler(x,y);
	}

    public int getHoogte() { return hoogte; }
    public int getBreedte() { return breedte; }

    public void links() {
    	speler.links();
    }
    public void rechts(int breedte) {
    	speler.rechts(this.breedte);
    }

	public Speler getSpeler() {
		return speler;
	}

	public boolean inHetRooster(){
		return true;

	}
}
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;



@SuppressWarnings("serial")
public class SpaceInvader extends Frame
	{
	    protected Rooster r;
	    protected View view;
	    protected Controller c;

	    public SpaceInvader()
	    {
	        r = new Rooster();

	        view = new View(r);
	        add(view);

	        c = new Controller(r, view);

	        this.addWindowListener( new WindowAdapter() {
	            public void windowClosing(WindowEvent e) {
	               dispose();
	               System.exit(0);
	            }
	        });

	    }


	    public static void main(String args[]) {
	        SpaceInvader venster = new SpaceInvader();
	        venster.setSize(1280,600);
	        venster.setTitle("SpaceInvader");
	        venster.setVisible(true);
	    }

	}public class Speler {

	private int x, y;


	public Speler(int x, int y)
	{
		this.x = x;
		this.y = y;
	}


	public int getX() {
		return x;
	}

	public int getY() {
		return y;
	}

	public void links() {
		if(x==0)
			System.out.println(x);
		else {
			x--;
			System.out.println(x);
		}
	}

	public void rechts(int breedte) {

		if(breedte == x){
			System.out.println(x);
		}
		else {
			x++;
			System.out.println(x);
		}
	}



}

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;


@SuppressWarnings("serial")
public class View extends Canvas
{
	private Rooster r;
	private Image buffer;
	private Speler s;

	public View(Rooster rooster)
	{
		r = rooster;
		s = r.getSpeler();
	}

	public void paint(Graphics g) {
        if (buffer == null
             || buffer.getWidth(null) != getWidth()
             || buffer.getHeight(null) != getHeight()
           ) {
          buffer = createImage(getWidth(), getHeight());
        }
        teken(buffer);
        g.drawImage(buffer, 0, 500, null); //(0,500) is de beginpositie van de speler

    }

    public void update(Graphics g) {
        paint(g);
    }

	 public void teken(Image buffer) {
	        Graphics g = buffer.getGraphics();
	        tekenPersoon(g);
	 }
	 protected void tekenPersoon(Graphics g)
	 {
		 // wist alles van het scherm, de x-coor, y-coord, de breedte & hoogte
		 g.clearRect(0,0, getWidth(), getHeight());
		 int x = s.getX();
		 int y = s.getY();
		 g.setColor(Color.black);
		 g.fillRect(x*40, y*40, 40, 40);


	 }



}