Building on our discussion of both Arrays and Classes, Bob looks at the pro’s and con’s of using simple arrays to store collections of references to objects through a series of examples. He then introduces the System.Collections namespace, and one type of collection specifically (ArrayList) demonstrating the added features you get by using a Collection rather than an Array to manage a group of objects. But when Bob tries to add a different type of object to the collection, problems start to crop up. This will provide the basis of conversation for the remainder of the day … how to add manage instances of different types who may share something in common (like the Print method). This also provides the basis for a discussion of the third tenet of Object Oriented Programming, namely “polymorphism”.

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