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Extra resources for Data Structures and Abstractions with Java (3rd Edition)

Example text

Some ADT operations have outputs analogous to the change, soda cans, messages, and warning lights that a vending machine provides. Now imagine that you are the designer of the front, or interface, of the vending machine. What can the machine do, and what should a person do to use the machine? Will it help you or hinder you to think about how the soda cans will be stored and transported within the machine? We maintain that you should ignore these aspects and focus solely on how someone will use the machine—that is, you focus on designing the interface.

In the examples of the previous section, each bag is an instance of a class that implements the ADT bag. That is, each bag is an object whose behaviors are the operations of the ADT bag. You can think of each such object as being like the vending machine we just described. Each object encapsulates the bag’s data and operations, just as the vending machine encapsulates its product (soda cans) and delivery system. Some ADT operations have inputs analogous to the coins you insert into a vending machine.

Output: The integer number of times anEntry occurs in the bag. contains(anEntry) +contains(anEntry: T): boolean Task: Tests whether the bag contains a particular object. Input: anEntry is an object. Output: True or false according to whether anEntry occurs in the bag. toArray() +toArray(): T[] Task: Looks at all objects in the bag. Input: None. Output: A new array of entries currently in the bag. Design Decision: What should happen when an unusual condition occurs? You as class designer need to make decisions about how to treat unusual conditions and include these decisions in your specifications.

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