ErikHK

import javax.microedition.lcdui.*;import javax.microedition.lcdui.game.*;import javax.microedition.midlet.*;import java.util.*;import java.lang.*;public class StudsApp extends MIDlet{    public Canvas canvasen = new canvas();    public static Vector vector = new Vector();    Boll boll = new Boll();        public void startApp(){        Display.getDisplay(this).setCurrent(canvasen);        canvasen.setFullScreenMode(true);        vector.addElement(boll);    }        public void pauseApp(){            }        public void destroyApp(boolean unconditional){        notifyDestroyed();    }}class canvas extends Canvas implements Runnable{    private Thread thread;    public int width = getWidth(), height = getHeight(), x = 4, y = 4, vx = 1, vy = 1,randomx,randomy;    Random r = new Random();            public canvas(){        new Thread(this).start();    }        public void run(){        while(true){            for (int i = 0; i < StudsApp.vector.size(); i++) {                ((Boll)StudsApp.vector.lastElement()).move(width,height);            }        }    }        public void paint(Graphics g){        g.setColor(0xFFFFFF);        g.fillRect(0,0,width,height+100);                        for (int i = 0; i < StudsApp.vector.size(); i++) {            g.setColor(((Boll)StudsApp.vector.elementAt(i)).color);            g.fillArc(((Boll)StudsApp.vector.elementAt(i)).x, ((Boll)StudsApp.vector.elementAt(i)).y, ((Boll)StudsApp.vector.elementAt(i)).radius,((Boll)StudsApp.vector.elementAt(i)).radius, 0, 360);            ((Boll)StudsApp.vector.elementAt(i)).move(width,height);        }        repaint();    }        protected void keyPressed(int keyCode){        switch(keyCode){            case -3:                vx -= 1;                break;            case -1:                vy -= 1;                break;            case -4:                vx += 1;                break;            case -2:                vy += 1;                break;            case 53:                final Boll boll = new Boll();                boll.vx = r.nextInt(2)+1;                boll.vy = r.nextInt(2)+1;                StudsApp.vector.addElement(boll);                break;        }    }    }class Boll{    static int x, y, color,radius, vx = 1, vy = 1;        public Boll(){        x = 5;        y = 5;        vx = 1;        vy = 1;        radius = 10;        color = 0x000000;    }            public static void move(int max_x,int max_y){        x += vx;        y += vy;        if(x > (max_x-radius) || x < 0)            vx = -vx;        if(y > (max_y) || y < 0)            vy = -vy;            }    }