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Trail: Learning the Java Language

Lesson: Interfaces and Packages

This chapter has been updated to reflect features and conventions of the latest release, JDK 5.0. If you notice any errors or omissions (or something you really like), please tell us.
This chapter talks about two Java programming language features that help you to manage relationships between classes that might not otherwise be related by the class hierarchy. First, you learn how to write and use an interface — a protocol of communication between objects. Second, you will learn how to bundle classes and interfaces into packages.

Creating and Using Interfaces (in the Learning the Java Language trail)

You saw an example of implementing an interface in the previous chapter. You can read more about interfaces — what they are for, why you might need to write an interface, and all about how to write one — in this section.

Creating and Using Packages (in the Learning the Java Language trail)

This section describes how to bundle your classes into packages and how to use classes that are in packages.

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