import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.WindowStateListener;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;

public class Main extends JFrame implements Runnable
{
    int x=40;
    int y=30;
    int width=50;
    int height=50;
    boolean xAdd=true;
    boolean yAdd=true;
    public void paint(Graphics g)
    {
        super.paint(g);
        //g.fillRect(x, y, width, height);
        g.setColor(Color.red);
        g.fillOval(x, y, width, height);
    }
    int i=1;
    @Override
    public void run()
    {
        // TODO Auto-generated method stub
        while(true)
        {
            if(yAdd)
                y+=15;
            else
                y-=15;
            if(y>=this.getHeight()-height||y=this.getWidth()-width||x