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Sorry - I have just read more closely! (I thought I had remembered from the other day...)

You have declared ArrayCalculation as a class OK, but you made it "abstract". It should not be abstract...

I haven't looked very closely, but I think all you need to do is replace the interface with the appropriate class. (Again you should have notes giving examples).

If there are still problems, post...

This error seems to arise when you are attempting to run the program, rather than compiling it. Eclipse does give compiler error messages (and underlines things in the code), but I would agree with...

What is the compiler message you get on this line? The messages are usually a good place to start - but sometimes they take a little explaining.