Jad is a 100% pure C++ program and it generally works several times faster than decompilers written in Java. Jad doesn't use the Java runtime for its functioning, therefore no special setup is required (like changes to the CLASSPATH variable).
Jad is not open source but it is free to use.
Make sure to download the GUI interface, FrontEnd Plus .
On Windows, a file association with the .class extension is made so if you click on a class file then the decompiled is shown in FrontEnd Plus right away.
JAD is good but out-dated, the new class format introduced with JDK1.5 is not well supported.
Normally, when opening a class file the Class File Viewer will show a brief API outline of the class. If you install this plug-in, however, the Class File Viewer will be replaced with the JadClipse Class File Viewer that shows the decompiled source of the class.
JD is Open Source and free to use.
Also available is JD-GUI, a standalone graphical utility that displays Java source codes of .class files, and JD-Eclipse, a plug-in for the Eclipse platform.
With JarPlug, it is possible delete or update items stored in a JAR.
Written and compiled by Réal Gagnon ©1998-2015
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