You will be writing the backend logic for a simple version of a video game sometimes known as "Bejeweled". You'll get lots of practice working with arrays, 2D arrays, and ArrayLists. Once you have your code working, you'll be able to integrate it with a GUI that we have provided to create a complete application.

here the link for the assignment http://web.cs.iastate.edu/~cs227/homework/hw3/hw3.pdf