Summary
This important chapter covers a great deal of material. The basics of the creation and implementation of objects and classes are explained in detail, along with ways to control access to methods and variables. Other topics covered here are the class hierarchy, ways to nest classes together, the creation of interfaces and packages, and the use of interfaces and packages to interrelate classes without the class hierarchy system. The next chapter introduces user interfaces and contains a few examples that tie together these various elements.
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