In java you dont have to do that

Thanks for your feedback! ;-)
Java version was created by translator. I've checked the code and do some changes:

1. Add testcase information in the random tests

2. Change the random string generate function, such as "word  !!! word" will not appear in tests.

It's not a valid word.
It should not appear in the tests ;-)
Are you meet a single "!" in the testcase? If you saw it, please tell me which language you are using, thanks.