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());
    }
    
    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++) {
            ((Boll)StudsApp.vector.elementAt(i)).draw(g);
            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:
                StudsApp.vector.addElement(new Boll());
                ((Boll)StudsApp.vector.lastElement()).vx = r.nextInt(2)+1;
                ((Boll)StudsApp.vector.lastElement()).vy = r.nextInt(2)+1;
                break;
        }
    }
    
}

class Boll{
    static int x, y, color,radius, vx, vy;
    
    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;
        
    }
    
    public void draw(Graphics g){
        g.setColor(color);
        g.fillArc(x,y,radius,radius,0,360);
    }
    
}