Summary

We modified the World class

• to get access to the JFrame object that is encapsulated in a World object.

We modified the SimplePicture class

• to control the color of the text that is placed on the image in a Picture object.

We placed a JButton object in the JFrame object

• and registered an anonymous ActionListener object on the button.

We placed a turtle object in a world

• and performed a series of maneuvers causing the turtle to draw a square spiral.