Oh, I see now! I didn't know that one can parse the submitted solution this way ))) Thanks!

Hello, thanks for the link, but unfortunately I can't figure out how to use it :) Is this a hyperlink? Or is it some file in your profile? How can I read it? Thanks!

Thanks! I am glad you liked the katas! As far as the imports are concerned, when I include them, some people say that it gives away the solution and the kata becomes too easy. When I don't include the imports, other people say that they should be there :) As for me, I don't like the online IDE, I usually copy the task into my desktop IDE and let it handle the imports.

Check out java 8 stream API ;)

Great solution!

Ok! I have changed the kata accordingly. Using reflection is also a great suggestion, I will make the change when I figure out exactly how to do it ;)

Hello, thanks for the suggestion! I will put the student class in the kata description for clarity.
But I am not sure that specifying the imports section alone will impose a strict requirement to use streams in solution. I think the best way would be to change the methods signature (replace Student[] array by Stream)

to smile67 - yes, you are right! ;) kata 2 is not harder than kata 1. My goal is to make a series of katas of the same level of difficulty (level 7) just to practice different ways to summarize information. Is there a better way to group katas than by giving sequential numbers?

Great suggestion! I guess, it will be the easiest way to test for using streams in this kata! Thanks

Thanks! Great suggestion!

Thanks for the suggestion! Ok, no problem ;)

I agree it's a good idea, but I couldn't think of any way to enforce using Stream API and unit test for it. Maybe you have some clue? Thanks!

Thanks! I have learned a better way to unit test IllegalArgumentException (with a @Test(expected = IllegalArgumentException.class) annotation). This is a bit prettier code ;)

Thank you, it is a great suggestion!

Thanks, great suggestion!