After integrated Java Decompiler (Jad) into Eclipse, when we click any java class file in eclipse, it will automatically decompile for us. This is very convenient and useful.

How to Integrated Java Decompiler with Eclipse

1) Download Jab and extract it
http://www.kpdus.com/jad.html

2) Download Jabclipse (net.sf.jadclipse_x.x.x.jar)
http://sourceforge.net/projects/jadclipse/

3) Copy Jabclipse(jadclipse_x.x.x.jar) to eclipse plugin folder

4) Restart Eclipse

5) Set Jadclipse Preference, Window –> Preference –> Java –> Jadclipse
Key in Jad path in Path to Decompiler field

6) Done, now we select any java class file, it will auto decompile it