Bouncing Balls - a demonstration of graphical output on a Canvas class. This project is part of the material for the book Objects First with Java - A Practical Introduction using BlueJ Sixth edition David J. Barnes and Michael Kölling Pearson Education, 2016 This project is discussed in chapter 6. This project provides a short graphical demo in the BallDemo class. This project provides scope for extension. The Canvas class does not usually need to be changed. It may be best to treat it as a library class (open the editor and switch to "documentation" view). Other classes can be changed or added. The book contains suggestions for various exercises.