Object-Oriented Programming Concepts
If you've never used
an object-oriented programming language before, you'll need to learn a few
basic concepts before you can begin writing any code. This lesson will
introduce you to objects, classes, inheritance, interfaces, and packages. Each
discussion focuses on how these concepts relate to the real world, while
simultaneously providing an introduction to the syntax of the Java programming
language.
An object is a
software bundle of related state and behavior. Software objects are often used
to model the real-world objects that you find in everyday life. This lesson
explains how state and behavior are represented within an object, introduces
the concept of data encapsulation, and explains the benefits of designing your
software in this manner.
A class is a
blueprint or prototype from which objects are created. This section defines a
class that models the state and behavior of a real-world object. It
intentionally focuses on the basics, showing how even a simple class can
cleanly model state and behavior.
Inheritance provides
a powerful and natural mechanism for organizing and structuring your software.
This section explains how classes inherit state and behavior from their
superclasses, and explains how to derive one class from another using the
simple syntax provided by the Java programming language.
An interface is a contract
between a class and the outside world. When a class implements an interface, it
promises to provide the behavior published by that interface. This section
defines a simple interface and explains the necessary changes for any class
that implements it.
A package is a
namespace for organizing classes and interfaces in a logical manner. Placing
your code into packages makes large software projects easier to manage. This
section explains why this is useful, and introduces you to the Application
Programming Interface (API) provided by the Java platform.
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