Decompiling Java .class files using JAD

I gave myself quite a fright today when after having a problem moving some CVS-backed Java source files around, I found that the code that I had written yesterday (and failed to check in) was now nowhere to be found.

Tracked it down to just one missing source file, and luckily I had a compiled class file of the old code. Now all I needed was a tool to resurrect the source file from the ashes...

After 5 minutes of searching around on Google I found what I was looking for, a Java decompiler called JAD. I downloaded the statically linked Intel Linux version, extracted the zip and placed my class file in the extracted directory.

Running JAD was as easy as ./jad IveMessedUp.class which produced the original in double quick time.

JAD was a life-saver (well time-saver at least) and so I wanted to spread the word about this lovely tool.

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1 comment:

Atanas said...

AndroChef successfully decompiles obfuscated Java 6 and Java 7 .class and .jar files. It is simple but powerful tool that allows you to decompile Java and Dalvik bytecode (DEX, APK) into readable Java source.
http://www.neshkov.com/ac_decompiler.html