Naming convention for utility classes in Java

Posted by Zarjay on Stack Overflow See other posts from Stack Overflow or by Zarjay
Published on 2010-04-20T16:10:28Z Indexed on 2010/04/20 16:13 UTC
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java

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naming-conventions

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best-practices

When writing utility classes in Java, what are some good guidelines to follow?

Should packges be "util" or "utils"? Is it ClassUtil or ClassUtils? When is a class a "Helper" or a "Utility"? Utility or Utilities? Or do you use a mixture of them?

The standard Java library uses both Utils and Utilities:

javax.swing.Utilities
javax.print.attribute.AttributeSetUtilities
javax.swing.plaf.basic.BasicGraphicsUtils

Apache uses a variety of Util and Utils, although mostly Utils:

org.apache.commons.modeler.util.DomUtil
org.apache.commons.modeler.util.IntrospectionUtils
org.apache.commons.io.FileSystemUtils
org.apache.lucene.wordnet.AnalyzerUtil
org.apache.lucene.util.ArrayUtil
org.apache.lucene.xmlparser.DOMUtils

Spring uses a lot of Helper and Utils classes:

org.springframework.web.util.UrlPathHelper
org.springframework.core.ReflectiveVisitorHelper
org.springframework.core.NestedExceptionUtils
org.springframework.util.NumberUtils

So, how do you name your utility classes?

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