Problem mit Java

import sum.kern.*;
import sum.werkzeuge.*;
public class snake
{
    // Objekte
    Bildschirm screen;
    Stift pen;
    Tastatur keyboard;
    Maus mice;
    Uhr clock;
    // Konstruktor
    public snake()
    {
        screen = new Bildschirm(600,600);
        pen = new Stift();
        mice = new Maus();
        clock = new Uhr();
        keyboard = new Tastatur();
        start();
    }

    // Dienste
    public void start()
    {
        int i;
        i = 1;
        pen.bewegeBis(300, 300);
        pen.runter();
        while (!mice.doppelKlick())
        {
            if (keyboard.wurdeGedrueckt())
            {
                if(keyboard.zeichen() == 'w')
                {
                    pen.dreheBis(90);
                }
                if(keyboard.zeichen() == 'a')
                {
                    pen.dreheBis(180);
                }   
                if(keyboard.zeichen() == 's')
                {
                    pen.dreheBis(270);
                }
                if(keyboard.zeichen() == 'd')
                {
                    pen.dreheBis(0);
                }
                keyboard.weiter();
            }
            pen.bewegeUm(1);
            clock.warte(20);
        }
        pen.hoch();
        pen.bewegeBis(10, 10);
        pen.schreibeText("YOU LOST!");
    }
}

double x = 14344.566567;
int y = (int)x;

import sum.kern.*;
import sum.werkzeuge.*;
/**
 * @author 
 * @version 
 */
public class snake
{   // Attribute
    Bildschirm screen;
    Stift pen;
    Tastatur keyboard;
    Uhr clock;

    // Konstruktor
    public snake ()
    {
        screen = new Bildschirm (800, 800);
        pen = new Stift ();
        keyboard = new Tastatur();
        clock = new Uhr();
        start ();
    }

    public void start () 
    {
        boolean beenden = false;
        pen.bewegeBis(400, 400);
        pen.runter();
        double[] collisionX = new double[800];
        double[] collisionY = new double[800];
        int x;
        int y;
        double kollisionX = 0;
        double kollisionY = 0;
        double Y;
        double X;
        while(beenden != true)
        {
            while(keyboard.wurdeGedrueckt())
            {
                switch(keyboard.zeichen())
                {
                    case 'a': case 'A': pen.dreheBis(180); break;
                    case 'd': case 'D': pen.dreheBis(270); break;
                    case 's': case 'S': pen.dreheBis(-90); break;
                    case 'w': case 'W': pen.dreheBis(90); break;
                }
                keyboard.weiter();
            }
            pen.bewegeUm(1);
            clock.warte(60);
            //Kollision
            kollisionX = pen.vPosition();
            kollisionY = pen.hPosition();
            x = (int)kollisionX;
            y = (int)kollisionY;
            if (collisionX[x] == pen.vPosition() && collisionY[y] == pen.hPosition())
            {
                break;
            }
            //Koordinatenspeicherung
            Y = pen.hPosition();
            X = pen.vPosition();
            x = (int)X;
            y = (int)Y;
            collisionX[x] = pen.vPosition();
            collisionY[y] = pen.hPosition();
        }
        pen.hoch();
        pen.bewegeBis(10, 10);
        pen.schreibeText("YOU LOST!");
    }   
}