Redo the Savings Account Demo program in Chapter 16 so that it uses Observer/Observable instead of creating your own classes and interfaces from scratch. The Savings Account class should inherit from...

Redo the Savings Account Demo program in Chapter 16 so that it uses Observer/Observable instead of creating your own classes and interfaces from scratch. The Savings Account class should inherit from Observable and the Fee Handler and Fraud Handler classes should implement Observer instead of implementing Balance Change Handler.