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Checkstyle vs PMD: What are the differences?
What is Checkstyle ? A static code analysis tool. It is a development tool to help programmers write Java code that adheres to a coding standard. It automates the process of checking Java code to spare humans of this boring (but important) task. This makes it ideal for projects that want to enforce a coding standard.
What is PMD? An extensible cross-language static code analyzer. It is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It includes CPD, the copy-paste-detector.
Checkstyle and PMD can be categorized as "Code Review" tools.
Checkstyle and PMD are both open source tools. Checkstyle with 4.71K GitHub stars and 6.95K forks on GitHub appears to be more popular than PMD with 2.42K GitHub stars and 830 GitHub forks.