I solved that kata this way. But previous guy made is shortly.))

It is not.

Fixed.

this method in CharSequence not in String class

There is indeed a trick!

It's negitive.so you need to do something.
You can print out and check the input.

You might want to avoid comparing Strings with ==, as it can fail under some situations.
Try using string1.equals(string2) instead which is very reliable.

your code doesn't works for arrays of type short

If you don't have fear the Dementor:

  result = result.replaceAll("\\s", "").replaceAll("\\[|\\]", "");

Requirements changed due to bug report so please return <0 instead of <1. To compensate I've addeded a pretty interesting solution hope you can find it amusing.

Can I get my java translation approved?

Interesting :) Thank you Zoidby

it's notation for variable number of String parameters or just an array

Why does the String... work in the argument list?

Thank you