Moving Ball

Hello,

The class BouncingBall makes the ball move around a box bouncing back and forth when it hits the "wall". My problems is that it moves too fast. Is there a way to make it move a little bit slower?

Code:
```public class BouncingBall extends SelfDrawingBall
{
int dx = 20;
int dy = 17;

public BouncingBall()
{
super();
}

public void bounce()
{
for (int i=0; i<500; i++)
{
if ((xPosition<0) || (xPosition + diameter)>300)
dx = -dx;
if ((yPosition<0) || (yPosition + diameter)>300)
dy = -dy;
super.move(dx,dy);
super.draw();
}
}
}```
Code:
```public class SelfDrawingBall extends Ball
{
public SelfDrawingBall  ()
{
super ();
}

protected void draw()
{
Canvas myCanvas = Canvas.getCanvas();
myCanvas.draw(this, colour, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
}
}```
Code:
```public class Ball
{
protected int diameter;
protected int xPosition;
protected int yPosition;
protected String colour;

public Ball()
{
diameter = 30;
xPosition = 100;
yPosition = 100;
colour = "red";
}

public Ball(int diam)
{
diameter = diam;
xPosition = 100;
yPosition = 100;
colour = "red";
}

public void blowUp ()
{
diameter = diameter + 10;
}

public void move (int dx, int dy)
{
xPosition = xPosition + dx;
yPosition = yPosition + dy;
}

public int getX ()
{
return xPosition;
}

public int getY ()
{
return yPosition;
}

public void setX (int newX)
{
xPosition = newX;
}

public void setY (int newY)
{
yPosition = newY;
}

public Shape shape()
{
return new java.awt.geom.Ellipse2D.Float(diameter, diameter, xPosition, yPosition);
}
}```