import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;


class Alien extends Sprite {

	private int stepSize;

	public Alien() {

		x = 0;
		y = 25;
		width = 20;
		height = 10;
		stepSize = 10;
		
	}	

	public void draw(JPanel panel) {

		Graphics paper = panel.getGraphics();
		paper.fillOval(x, y, width, height);
		
	}	

	public void move() {

		if (x > 125 || x < 0) {
					
			stepSize = -stepSize;
		}
		
		x = x + stepSize;
	}
}