import java.awt.*;
import java.awt.event.*;
public class pall extends Frame implements MouseListener,Runnable{
	int px=337;
	int py=100;
	int ax=1;
	int ay=1;
	int xn,yn;
	String xsuund,ysuund;
	public pall(){
		setTitle("Põrkav pall");
		setSize(500,700);
		setVisible(true);
		addWindowListener(
		  new WindowAdapter(){
		    public void windowClosing(WindowEvent e){
		      System.exit(0);
		    }//windowevent
		  } //windowadapter
		); //windowlistener
	   addMouseListener(this);
       new Thread(this).start();
    }

public void run(){
	while(true){
		p6rka();
		px=(ax*1+px);
		py=(ay*1+py);
		if (px>470){
		ax=-1;}
		if (px<0){
		ax=1;}
		if (py>670){
		ay=-1;}
		if (py<0){
		ay=1;}
		//nüüd vahesein:
		if(py==350){if(px<250){if(px>0){
		ay=ay*(-1);}}}
		
    }//while
  }//run

public void p6rka(){
	  	Graphics g=getGraphics();
		g.setColor(Color.white);
		g.fillRect(1,1,500,700);
		g.setColor(Color.blue);
		g.fillRect(0,350,250,5);
		g.setColor(Color.red);
		g.fillOval(px,py,30,30);
		//System.out.println("x:"+px+" y:"+py+" ax: "+ax+" ay "+ay);
		try{
		Thread.sleep(1);
		}//try
		catch(Exception exp){
		System.out.println("catch"); 
		}//catch 
	//System.out.println("public void p6rka");
}

	public void mousePressed(MouseEvent e){}
	public void mouseReleased(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mouseClicked(MouseEvent e){}
	
public static void main(String argumendid[]){
	  new pall();
   }
   
}