package Thread; import java.awt.geom.*; /** * * @author Administrator * */ public class Ball { private static final int XSIZE=15; private static final int YSIZE=15; private double x=0; private double y=0; private double dx=1; private double dy=1; public void move(Rectangle2D bounds){ x+=dx; y+=dy; if(x=bounds.getMaxX()){ x=bounds.getMaxX()-XSIZE; dx=-dx; } if(y=bounds.getMaxY()){ y=bounds.getMaxY()-YSIZE; dy=-dy; } } public Ellipse2D getShape() { return new Ellipse2D.Double(x,y,XSIZE,YSIZE); } }