Enthuware

Hi, just a doubt shouldnt the 2nd last correct option be invokeAll(list) and not invokeAll(subactions) ?
thanks!

No, you need to pass a collection of RecursiveAction to invokeAll. Please take a look at the examples here: http://docs.oracle.com/javase/7/docs/ap ... ction.html

HTH,
Paul.

I have a doubt regarding when should I use fork and join from the else block (when the task is bigger than threshold value) and when I should use invoke()?

You should either go through a good book or check out this link: https://docs.oracle.com/javase/tutorial ... kjoin.html
or
http://www.javaworld.com/article/207844 ... rvice.html