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);
    }
     */
    
}