February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Object-Based Collections
The collections framework classes and interfaces are members of package java.util. In early Java versions, the collections framework classes stored and manipulated only Object references, enabling you to store any object in a collection, because all classes directly or indirectly derive from class Object. Programs normally need to process specific types of objects. As a result, the Object references obtained from a collection need to be downcast to an appropriate type to allow the program to process the objects correctly. As we discussed in Chapter 10, downcasting generally should be avoided.
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