Ghost.java

import java.awt.*;

public class Ghost implements Drawable{
    private int positionX = 400;
    private int positionY = 400;

    @Override
    public void draw(Graphics g) {
        g.setColor(Color.RED);
        if (Math.random()>0.5) {
            if (Math.random()>0.5) {
                positionX += 20;
            }
            else {
                positionX -= 20;
            }
        }
        else {
            if (Math.random()>0.5) {
                positionY += 20;
            }
            else {
                positionY -= 20;
            }
        }
        if (positionX > 400) { positionX = 400; }
        if (positionY > 400) { positionY = 400; }        
        if (positionX < 0) { positionX = 0; }        
        if (positionY < 0) { positionY = 0; }        
        
    }    
}