If Color objects were not immutable, what would we have to worry about?

A good answer might be:

Some outside agent might change the Color object that color refers to, and the Circle object would now have a different color. This might not be wanted.

Color Test Applet

Here is an applet that tests the new features. It draws ten circles in red and ten circles in blue. The red circles are moved slightly to the left, and the blue circles are moved slightly to the right. 

// assume that the drawing area is 200 by 200
public class testCircleRedBlue extends Applet
{
  Circle circ = new Circle();
  
  public void paint ( Graphics gr )
  { 

    int count = 1;
    while ( count <= 10 )
    {
      circ.setRadius(  (100/10)*count );

      circ.setColor( Color.red );
      circ.setPosition( 100-count/2, 100 );
      circ.draw( gr );

      circ.setColor( Color.blue );
      circ.setPosition( 100+count/2, 100 );
      circ.draw( gr );

      count = count + 1;
    }
  }
}

Here is what the applet draws.

If you don't see the picture, your browser is not running Java. Perhaps you are lucky.

QUESTION 14:

What would you do if you had a pair of red/blue 3D vision glasses?

Click Here after you have answered the question