13.3 Incorporating Inheritance and Polymorphism into the ATM System
[Note: This section can be taught after Chapter 10.]
We now revisit our ATM system design to see how it might benefit from inheritance. To apply inheritance, we first look for commonality among classes in the system. We create an inheritance hierarchy to model similar (yet not identical) classes in a more elegant and efficient manner. We then modify our class diagram to incorporate the new inheritance relationships. Finally, we demonstrate how our updated design is translated into Java code.
In Section 12.3, we encountered the problem of representing a financial transaction in the system. Rather than create one class to represent all transaction types, we decided to create ...
Get Java How to Program (early objects), 9/e now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
