You can even use online class file decompilers like to upload your class file and see there source code on browser itself, quite convenient if you can upload your class file via internet. Krakatau (open-source and actively developed) Procyon (open-source and actively developed)

Here is a list of some popular Java class file decompilers : There are lots of free and open source Java decompilers are out there, you can use any of them to decompile java class files from command prompt.

I don't use IDE for such purpose, so any plain old command will help. Precisely, I have a Java class file, which doesn't use any library and I want to see the code. What is the best ways to decompile Java class files from command prompt? Examples given here doesn't show how to get full decompiled code, rather than byte code or just method and fields name. I have provided a step by step instructions here to install JD-Eclipse, hopefully that will be helpful to some of our fellow programmers. You need the decompiled code to be aligned with its original line numbers, so you can set breakpoints in the decompiled code.

JD-Eclipse is certainly useful, but it didn't go quite far enough. If you are already familiar with Eclipse plugin installation then it just a cakewalk. JD-Eclipse is easy to install and its site has a detailed step by step guide on how to install JD-Eclipse plug-in. My search ends with JD-Eclipse, this is another free Eclipse plugin for non-commercial and personal use which helps you to get the source from class files. Thanks to Eclipse IDE and the increasing number of free plug-ins available for Java developers, You can have powerful Java decompile in your armory.Įarlier I used to used JadEclipse an Eclipse plugin that works well with JAD decompiler but knowing about the JAD decompiler is not supporting Java 1.5 source, I was in hunt of another suitable and useful Eclipse plugin which can decompile. By using Java decompiler you can easily check out the source of any. Java decompiler (a program that can decompile Java class files to produce source files) is very helpful in such a situation.

Though I always prefer to attach sources in Eclipse of most common libraries like JDK it’s not always possible with an increasing number of dependencies. The ability to decompile a Java class file is quite helpful for any Java developer who wants to look into the source of any open source or propriety library used in a project.

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