Reverse Engineering in Java

 Reverse Engineering  is  some thing which i really wanted to do. It was just out of curiousity i tried it some time back when i was in my UG. Now it was a requirement for my project so i had to reverse Engineer a code  ie convert the .class file to .java file.

    I used Mocha written by Hanpeter van Vliet , One of the most used tool ,to reverse Engineer in Java.  It has around 200+ classes  in a .zip file.  There is no need to unzip the “mocha.zip” file contained in the distribution zip file; Java knows how to get .class files out of zip files. Simply put “mocha.zip” in a safe place, for instance the JDK directory. Add the full pathname of “mocha.zip” to your CLASSPATH string, for instance:

    SET CLASSPATH=c:\myclasses;c:\jdk\mocha.zip

 Now the next question would be to invoke it. 

Mocha is invoked from the commandline like this:

    java mocha.Decompiler [-v] [-o] Class1.class Class2.class …

Where
   “java”               invokes the Java virtual machine,
   “mocha.Decompiler”   (note the case!) specifies the class to run,
   “-v”                 optionally specifies verbose output,
   “-o”                 optionally overwrites existing .mocha files,
   “ClassX.class”       specifies the .class file(s) to decompile.

Wildcards (* and ?) are accepted.

 Cool you just did a great Job of converting a compiled .class file back to your .java file

cheers!!