Some tools:

• refer: http://jd.benow.ca/
• install: http://jd.benow.ca/jd-eclipse/update

There is one more important step pending:

1. Step1: In your eclipse application go to Windows > Preferences
2. Step2: General > Editors > File Associations
3. Step3: Click Add for Associated Editors
   • Select *.class and add Class File Editor and make it default.
   • Select *.class without source and add Class File Editor and make it default.

Now you can open your code and you should be able to decompile any of your jar files by either Ctrl + Clicking on the code base or via your Package Explorer.

DJ Decompiler using jad tool for decompiling class of java. We can download jad tool at: http://varaneckas.com/jad/

refer: http://web.udl.es/usuaris/jordim/Progs/Readme.txt Before run jad tool, we add path d:\tools\decomp(path of DJ Decompiler) to environment variable PATH in windows
Favorite command:

set PATH=%PATH%;d:\tools\decomp
jad -o -r -sjava -dsrc classes/**/*.class

jad abc.class

⇒ generate abc.jad

jad *.class

⇒ generate all .class to jad file

jad -sjava *

jad -o -dtest -sjava *.class

Below are structure directory of us before run:

• directory classes contain all file .class
• directory src will contain all java which we decompile

So we will run below command for decompiling all .class file in directory classes to src

jad -o -r -sjava -dsrc classes/**/*.class