java-design-patterns/README.md

<!-- the line below needs to be an empty line C: (its because kramdown isnt
     that smart and dearly wants an empty line before a heading to be able to
     display it as such, e.g. website) -->

# Design patterns implemented in Java

[![Build status](https://travis-ci.org/iluwatar/java-design-patterns.svg?branch=master)](https://travis-ci.org/iluwatar/java-design-patterns)
[![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/iluwatar/java-design-patterns/master/LICENSE.md)
[![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
[![Sonarcloud Status](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=alert_status)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns) 

# Introduction

Design patterns are the best formalized practices a programmer can use to
solve common problems when designing an application or system.

Design patterns can speed up the development process by providing tested, proven
development paradigms.

Reusing design patterns help prevent subtle issues that cause major
problems, and it also improves code readability for coders and architects who
are familiar with the patterns.

# Getting started

This site showcases Java Design Patterns. The solutions have been developed by
experienced programmers and architects from the open source community. The 
patterns can be browsed by their high level descriptions or by looking at their
source code. The source code examples are well commented and can be thought as
programming tutorials how to implement a specific pattern. We use the most
popular battle-proven open source Java technologies.

Before you dive into the material, you should be familiar with various
software design principles.

All designs should be as simple as possible. You should start with KISS, YAGNI,
and Do The Simplest Thing That Could Possibly Work principles. Complexity and
patterns should only be introduced when they are needed for practical
extensibility.

Once you are familiar with these concepts you can start drilling down into
patterns by any of the following approaches

 - Using difficulty tags, `Difficulty-Beginner`, `Difficulty-Intermediate` & `Difficulty-Expert`.
 - Using pattern categories, `Creational`, `Behavioral`, and others.
 - Search for a specific pattern. Can't find one? Please report a new pattern [here](https://github.com/iluwatar/java-design-patterns/issues).

Hopefully you find the object oriented solutions presented on this site useful
in your architectures and have as much fun learning them as we had developing them.

# How to contribute

If you are willing to contribute to the project you will find the relevant information in 
our [developer wiki](https://github.com/iluwatar/java-design-patterns/wiki). We will help 
you and answer your questions in the [Gitter chatroom](https://gitter.im/iluwatar/java-design-patterns).

# License

This project is licensed under the terms of the MIT license.