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Java design patterns 101

David Gallardo, Author

David Gallardo is a contributing developerWorks author.

Summary: Design patterns capture the experience of expert software developers and present common recurring problems, their solutions, and the consequences of those solutions in methodical way. This tutorial explains why patterns are useful and important for object-oriented design and development; how patterns are documented, categorized, and cataloged; when they should be used; what some important patterns are; and how they are implemented.

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Date: 08 Jan 2002
Level: Introductory
PDF: A4 and Letter (62 KB | 18 pages)Get Adobe® Reader®

Activity: 78691 views
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About this tutorial

Should I take this tutorial?

This tutorial is for Java programmers who want to learn about design patterns as a means of improving their object-oriented design and development skills. After reading this tutorial you will:

Understand what design patterns are and how they are described and categorized in several well-known catalogs
Be able to use design patterns as a vocabulary for understanding and discussing object-oriented software design
Understand a few of the most common design patterns and know when and how they should be used

This tutorial assumes that you are familiar with the Java language and with basic object-oriented concepts such as polymorphism, inheritance, and encapsulation. Some understanding of the Unified Modeling Language (UML) is helpful, but not required; this tutorial will provide an introduction to the basics.

What is this tutorial about?

Design patterns capture the experience of expert software developers, and present common recurring problems, their solutions, and the consequences of those solutions in methodical way.

This tutorial explains:

Why patterns are useful and important for object-oriented design and development
How patterns are documented, categorized, and cataloged
When patterns should be used
Some important patterns and how they are implemented

Tools

The examples in this tutorial are all written in the Java language. It is possible and sufficient to read the code as a mental exercise, but to try out the code requires a minimal Java development environment. A simple text editor (such as Notepad in Windows or vi in a UNIX environment) and the Java Development Kit (version 1.2 or later) are all you need.

A number of tools are also available for creating UML diagrams (see Resources ). These are not necessary for this tutorial.

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