What is Java Decompiler?
It is a computer program which converts the class files in to Java source code, in a user friendly format.
How to install it in Eclipse?
In eclipse we need to go to Help --> Eclipse Marketplace --> type search "decompiler"
next: select and install Enhanced Class Decompiler 3.1.1 or greater from the list
Now Make it Work
This step works in eclipse oxygen and later versions..
Click on "Windows--> Preferences --> General --> Editors --> File Associations"
Change default viewer to .class files, means
"*.class" : "Class Decompiler Viewer" is selected by default.
"*.class without source" : "Class Decompiler Viewer" is selected by default.
