import  java.awt.*;
 import  java.applet.*;
 import  java.awt.event.*;
 import  java.util.*;

 class  Ball {
     protected   int  x,y;//koord
     protected   int  d;//diam
     protected   int  stepX, stepY;//speed
     protected  Color c;
     public   int  getX() { return  x;}
     public   int  getY() { return  y;}
     public   int  getD() { return  d;}
     public  Color getC() { return  c;}
     public   void  setX( int  _x) {x=_x;}
     public   void  setY( int  _y) {y=_y;}
     public   void  setStepX( int  _x) {stepX=_x;}
     public   void  setStepY( int  _y) {stepY=_y;}
    Ball ( int  _x,  int  _y,  int  _d,  int  _stepX,  int  _stepY, Color _c) {
	x=_x; y=_y; d=_d; stepX=_stepX; stepY=_stepY; c=_c;
    }
     public   void  paint(Graphics g) {
	g.setColor(c);
	g.fillOval(x,y,d,d);
    }
}

 class  RedBall  extends  Ball {
    RedBall( int  w,  int  h) {
	 super (( int )((w- 20 )*Math.random()), ( int )((h- 20 )*Math.random()),  20 ,  1 ,  1 , Color.red);
    }
     public   void  stepX( int  m,  int  w) {
	 if  (x+m*stepX>= 0  && x+m*stepX+d<=w)
	    x+=m*stepX;
    }
     public   void  stepY( int  m,  int  h) {
	 if  (y+m*stepY>= 0  && y+m*stepY+d<=h)
	    y+=m*stepY;
    }
}

 class  BlackBall  extends  Ball {
    BlackBall() {
	 super ( 0 ,  0 ,  20 ,  2 ,  2 , Color.black);
    }
     public   void  stepX( int  m) {x+=m*stepX;}
     public   void  stepY( int  m) {y+=m*stepY;}
}

 class  Action {
     private   static   int  score= 0 ;
     private   static  RedBall redBall;
     private   static  BlackBall blackBall;
     private   static   int  h;
     private   static   int  w;
     public   static   void  setBalls(RedBall _redBall, BlackBall _blackBall) {
	redBall = _redBall;
	blackBall = _blackBall;
    }
     public   static   void  setSize( int  _w,  int  _h) {
	w=_w;
	h=_h;
    }
     public   static   int  getScore() { return  score;}
     public   static   void  action() {
	 int  dist = ( int ) (Math.sqrt((redBall.getX()-blackBall.getX())*(redBall.getX()-blackBall.getX())+
				    (redBall.getY()-blackBall.getY())*(redBall.getY()-blackBall.getY())));
	 if  (dist<=redBall.getD()) score++;
//	if (score==0)
//	    showStatus("Hit it!");
//	else if (score==1)
//	    showStatus("Great! You have hit it!");
//	else
//	    showStatus("You have shot down "+score+" balls");
	 if  ((blackBall.getY()>h) || (blackBall.getX()>w) || (dist<=redBall.getD())) {
	    blackBall.setX(( int )((w-blackBall.getD())*Math.random()));
	    blackBall.setY( 0 );
	    blackBall.setStepX(( int )( 3 *Math.random())+ 2 );
	    blackBall.setStepY(( int )( 3 *Math.random())+ 2 );
	}
    }
}

 class  Move  extends  TimerTask {
     private   int  w;
     private   int  h;
     private  BlackBall blackBall;
    Move( int  _w,  int  _h, BlackBall _blackBall) {
	w=_w;
	h=_h;
	blackBall=_blackBall;
    }
     public   void  run() {
	blackBall.stepX( 1 );
	blackBall.stepY( 1 );
	Action.action();
    }
}

 public   class  ShootDownBalls  extends  Applet  implements  KeyListener {
     private  RedBall redBall;
     private  BlackBall blackBall;
     private   int  w,h;
     private   int  score= 0 ;
     private  Timer timer;
     private  Move move;
     public   void  init() {
	w=getSize().width;
	h=getSize().height;
	
	redBall= new  RedBall(w, h);
	blackBall= new  BlackBall();
	Action.setBalls(redBall, blackBall);
	Action.setSize(w, h);
	
	addKeyListener( this );
	
	requestFocus();
	
	showStatus("Hit it!");
	
	timer =  new  Timer();
/*	Calendar date=Calendar.getInstance();
	date.set(Calendar.DAY_OF_WEEK, 0);
	date.set(Calendar.HOUR, 0);
	date.set(Calendar.MINUTE, 0);
	date.set(Calendar.SECOND, 0);
	date.set(Calendar.MILLISECOND, 0);
	move = new Move(w, h, blackBall);
	timer.schedule(move, date.getTime(), 500);
*/
	move =  new  Move(w, h, blackBall);
	timer.schedule(move,  0 ,  500 );
    }
    
     public   void  paint(Graphics g) {
	redBall.paint(g);
	blackBall.paint(g);
    }
    
     public   void  keyPressed(KeyEvent k_e) {
	 switch  (k_e.getKeyCode()) {
	     case  KeyEvent.VK_DOWN:		redBall.stepY( 1 , h);		 break ;
	     case  KeyEvent.VK_UP:		redBall.stepY(- 1 , h);		 break ;
	     case  KeyEvent.VK_LEFT:		redBall.stepX(- 1 , w);		 break ;
	     case  KeyEvent.VK_RIGHT:		redBall.stepX( 1 , w);		 break ;
	}
	Action.action();
	repaint();
    }
    
     public   void  keyReleased(KeyEvent k_e) {}
     public   void  keyTyped(KeyEvent k_e) {}
}