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Effective Java, 2nd Edition by Joshua Bloch

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Chapter 4. Classes and Interfaces

Classes and interfaces lie at the heart of the Java programming language. They are its basic units of abstraction. The language provides many powerful elements that you can use to design classes and interfaces. This chapter contains guidelines to help you make the best use of these elements so that your classes and interfaces are usable, robust, and flexible.

Item 13: Minimize the accessibility of classes and members

The single most important factor that distinguishes a well-designed module from a poorly designed one is the degree to which the module hides its internal data and other implementation details from other modules. A well-designed module hides all of its implementation details, cleanly separating its ...

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