1. Write a program that displays an 8-by-8 grid of panels, all of which are initially colored white. When the user presses the mouse within a panel, its color should change to a randomly generated...

1. Write a program that displays an 8-by-8 grid of panels, all of which are initially colored white. When the user presses the mouse within a panel, its color should change to a randomly generated color.

2. Define a Rectangle class to represent rectangles. Modify the program of Section 6.6 so that it uses two rectangles instead of two circles.