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Static code analysis

Your code may work perfectly fine, however, what about the quality of the code itself? How do we ensure it is maintainable and written in a good style?

Static code analysis is an automatic process of checking the code without actually executing it. In most cases, it implies checking a number of rules on the source code. These rules may apply to a wide range of aspects; for example, all public classes need to have a Javadoc comment; the maximum length of a line is 120 characters, or if a class defines the equals() method, it has to define the hashCode() method as well.

The most popular tools to perform the static analysis on the Java code are Checkstyle, FindBugs, and PMD. Let's look at an example and add the static code ...