8.5. Abstract Data Types

The abstract data types are contained in the com.samscdrental.model.adt package:

 CustomerID.java     PhysicalID.java     Timestamp.java     UPCCode.java     Dollar.java     Name.java 

The ADTs have no dependencies to the model. They are reusable in a number of different programs. They represent common data types: CustomerID , PhysicalID , Timestamp , UPCCode , Dollar , and Name .

Each ADT has methods for converting to and from strings. Two ADTs have corresponding display classes, since they appear in GUI dialogs. These two are CustomerIDTextField and PhysicalIDTextField . If the other ADTs appear in future dialogs, equivalent widgets will be created.