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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();        public void startApp(){        Display.getDisplay(this).setCurrent(canvasen);        canvasen.setFullScreenMode(true);        vector.addElement(new Boll(1,1));    }        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;    //public static Boll boll = new Boll();    Random r = new Random();            public canvas(){        new Thread(this).start();    }        //public void start(){        //Thread t = new Thread(this);        //t.start();    //}        public void run(){        while(true){            for (int i = 0; i < StudsApp.vector.size(); i++) {                ((Boll)StudsApp.vector.elementAt(i)).move(width,height);            }        }    }        public void paint(Graphics g){        g.setColor(0xFFFFFF);        g.fillRect(0,0,width,height+100);                g.setColor(0x000000);        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);        }                 //for (int i = 0; i < StudsApp.vector.size(); i++) {            //((Boll)StudsApp.vector.elementAt(i)).draw(g);          //  repaint();        //}        repaint();    }        protected void keyPressed(int keyCode){        //System.out.println(((Boll)StudsApp.vector.elementAt(0)).x);        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(r.nextInt(3),r.nextInt(3));                StudsApp.vector.addElement(boll);                //System.out.println(StudsApp.vector.size());                //boll.x = r.nextInt(width);                //boll.y = r.nextInt(height);                //((Boll)StudsApp.vector.lastElement()).vx = r.nextInt(2)+1;                //((Boll)StudsApp.vector.lastElement()).vy = r.nextInt(2)+1;                boll.x = 50;                //((Boll)StudsApp.vector.lastElement()).color = 0x039003;                //repaint();                                break;        }    }    }class Boll{    static int x, y, color,radius, vx, vy; //vx = 1, vy = 1;            public Boll(int vx, int vy){        x = 5;        y = 5;        this.vx = vx;        this.vy = vy;        //vx = 1;        //vy = 1;        radius = 15;        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;            }        /*    public void draw(Graphics g){        g.setColor(color);        g.fillArc(x,y,radius,radius,0,360);    }     */    }