Eclipse Checkstyle Tutorial explains step by step details of installing and configuring Checkstyle plugin with eclipse.

What is Checkstyle?

How to configure Checkstyle plugin with eclipse?

Checkstyle is a free source code analysis tool helps to improve your code quality by checking with certain pre-configured standards.

Checkstyle is also available as a command line tool. If you have a different IDE other than Eclipse, plug-ins available for Netbeans, IntelliJ IDEA & etc.