How to attach(add) javadoc or source code in Eclipse

in this video you will see how you can attach java source code javadoc to your eclipse so that you can see source code of class, interface, enum or method when you press ctrl key + mouse left button instead of below error message:-
Source not found

[sunsigne]

Finally ! After 1 hour of research, it's THIS video that solved my problem. Thank man :)

[MuzickaTV]

Thanks!! i searched it a lot before i found this, thumbs up bro ;)

[MrAsgar]

Thank you so much you have saved my time .

[yadav]

Thanks, Tarun! 100% helpful. To the point. Perfect.

[Boxcow]

Not sure why my installation didn't include this. Thanks man.

[Vikassingh-svtt]

Thanks a lot bro, fixed in a minute 👍

[kanwaljeet]

thnaks, i was finding for this and asking to every one. but this done bcoz of this video

[bgez]

most straight forward video out there thank you

[jamesng]

Thanks a lot. Very helpful information with clear and precise instructions. Exactly what I was looking for.

[rmain]

omg thank you so much must have wasted 6hours trying to figure thid out

[ramdaswaghmode]

Thanks a lot, it very helpful..
Outstanding.

[sagarbayas]

Thanks Man !! Helped me to get move on my stucked issue :)

[dhruv]

Thanks.. Information shared was rare and very useful :)

[mayurchaudhari]

Thank u so much brother...u made my day.

[AmmarRai]

"Windows" -> "Preferences" -> "Java" -> "Installed JREs"
Select JRE and click "Edit" button
Expand "rt.jar" and click "Source Attachment: none"
Click on "Source Attachment" button.
Click on "External location" radio button and click on "External Folder" button.
Go to where JDK is installed on filesystem.
Example: C:\Program Files\Java\jdk1.8.0_161
and select the src.zip file.
Click the "Ok" button and then the "Finish" button.

Done!

[luchadb]

Who down voted this man ?? ....
Thanks