Java Reference
In-Depth Information
Classes, the templates used to create objects that can store data and
accomplish tasks, turn up in everything you do with the Java language.
Today, you extend your knowledge of classes by learning more about how
to create them, use them, organize them, and establish rules for how
other classes can use them.
The following subjects are covered:
Controlling access to methods and variables from outside a class
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Finalizing classes, methods, and variables so that their values or
definitions cannot be subclasses or cannot be overridden
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Creating abstract classes and methods for factoring common
behavior into superclasses
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Grouping classes into packages
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Using interfaces to bridge gaps in a class hierarchy
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