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<p>Code and Design <a href="http://en.wikipedia.org/wiki/Refactoring">Refactoring</a> is any change to a computer systems' code or design which improves its readability or simplifies its structure without changing its results.</p>

<p>Here we illustrate refactoring techniques which are applicable to Groovy. In general, most Java refactoring techniques apply equally well to Groovy. Sometimes Groovy adds a new twist as well.</p>

<p>We don't discuss tool support to auto implement some of these refactoring techniques. Consult your IDE plugin documentation to see if it has any specific support that you can use.</p>

<h3>Refactoring Techniques</h3>
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<h3>References</h3>

<ol>
	<li>Martin Fowler (1999). <em>Refactoring: Improving the Design of Existing Code</em>. Addison-Wesley. ISBN 0-201-48567-2.</li>
	<li>Joshua Kerievsky (2004). <em>Refactoring To Patterns</em>. Addison-Wesley. ISBN 0-321-21335-1.</li>
	<li>Michael Feathers (2005). <em>Working Effectively with Legacy Code</em>. Prentice Hall. ISBN 0-13-117705-2.</li>
	<li>Dierk Koenig with Andrew Glover, Paul King, Guillaume Laforge and Jon Skeet (2007). <em>Groovy in Action</em>. Manning. ISBN 1-932394-84-2. Discusses the importance of having tests in place before refactoring.</li>
</ol>

<p>See also: <a class="confluence-link" href="/display/GROOVY/Design+Patterns+with+Groovy" data-linked-resource-id="75229" data-linked-resource-type="page" data-linked-resource-default-alias="Design Patterns with Groovy" data-base-url="http://docs.codehaus.org">Design Patterns with Groovy</a></p>