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Activity 9 – Methods that access an object's attributes Run the GetSetMessages application. A window should open, presenting on the left a set of buttons to send messages to a MyCircle object and on the right a drawing area showing a small, black circle. Your computer should look similar to the screen shot in the figure below:
Perform the following tasks on the circle object by clicking the appropriate message buttons: (1) Find out X position of circle (Hint: Use the message button int getX() ) Note: The X position is not the centre, but the top, left of a square defining the circle's location (2) set the X position of the circle to 200 (Hint: Use the message button setX( int ) ) (3) Find out the radius of the circle object (4) Make the radius larger by scaling by a factor of 2 (5) Find out the radius again (now the circle is larger) (6) Make the radius of the circle the same size as before doubling. (Hint: Do this by scaling by a factor of 0.5) (7) Try to make the radius zero by scaling by a factor of zero Make a note of what happens – i.e. find out what the radius is after scaling by zero. Discussion of Activity 9 – Methods that access an object's attributes
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