CHAPTER
9 Packages and Interfaces
This chapter examines two of Java’s most innovative features: packages and interfaces. Packages are containers for classes. They are used to keep the class name space compartmentalized. For example, a package allows you to create a class named List, which you can store in your own package without concern that it will collide with some other class named List stored elsewhere. Packages are stored in a hierarchical manner and are explicitly imported into new class definitions. As you will see in Chapter 16, packages also play an important role in the new modules feature added by JDK 9.
In previous chapters, you have seen how methods define the interface to the data in a class. Through the use of the interface ...
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