6.5. Summary
In this chapter, you learned the following:
Collections are special types of objects used to gather up and manage references to other objects.
An array is a simple, fixed-length collection type that stores elements of a single type.
In addition to arrays, the .NET FCL provides other more powerful collection types to draw upon with OOPL, such as the following:
Ordered lists
Sets
Dictionaries
Generic collection classes can be used to achieve reusability, type-safety, and efficiency when working with collections.
We can work around the limitation that a method can only return one result by having that result be a collection of objects.
Declaring a collection of supertypes can be used to make arrays and generic collections more versatile.
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