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Lesson: Classes, Interfaces, and Packages

In the lesson entitled Object-Oriented Programming Concepts you read about the concepts behind object-oriented programming. Now it's time to get to work and put those concepts to practical use in Java.

Creating Classes

This section provides a complete description of a larger class, Stack, and describes all of the components of a class that provide for the life cycle of an object created from it. It talks first about constructors, then about member variables and methods.

Managing Inheritance

This section tells you what you need to know to manage inheritance up and down from your classes. First, it describes generally what a subclass gets from its ancestors and specifically what every class gets from the Object class. Second, it discusses how to control whether your class can be subclassed and whether its subclasses can override its methods.

Creating Interfaces

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.

Implementing Nested Classes

The Java programming language lets you define a class, called a nested class, within another class. Inner Classes are a special type of nested class.

Creating and Using Packages

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

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