Chapter 6. Interfaces and Inner Classes
You have now seen all the basic tools for object-oriented programming in Java. This chapter shows you several advanced techniques that are commonly used. Despite their less obvious nature, you will need to master them to complete your Java tool chest.
The first technique, called interfaces, is a way of describing what classes should do, without specifying how they should do it. A class can implement one or more interfaces. You can then use objects of these implementing classes whenever conformance to the interface is required. After we cover interfaces, we take up cloning an object (or deep copying, as it ...
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