There are many programmers who often work with Java, creating their classes and programming different libraries. So, for all of them a utility like Sothink Java Decompiler would be highly useful. It lets you decompile any Java file and get the source code; in other words from a class file get the corresponding source code.
Sothink Java Decompiler is quite interesting because Mocha can`t generate the code from just any Java file.
It is also interesting that Sothink Java Decompiler can be run from the Windows command line.