Java Puzzlers - 'Hello Whirled' challenge

Just for fun, here's a little challenge from the book. (if you have the book, no cheating)

Take the following code, and tell me what does it print?

It initially looked it would print "Hello world". But then I copied the code and when I tried to compile it, I realised the error! Interesting find.

I too guessed output to be Hello world, and then to check my answer, tried to copy the code and run. Unfortunately, I copied only the code part (without comment), so it worked perfectly for me :P . I had to look up the answer in the book to find out what am I missing.

It was a real devil this one I thought.

For the benefit of everyone else, the twist in this code was the fact that the compiler was attempting to interpret some UniCode value in the comment block when it encountered a \u pattern. So in the comment line:

from F:\TestRoot\apps\a1\units\include\PolicyHome.idl

The Java Compiler is attempting to resolve "\units" as Unicode, which it is not, so fails.

Agree; if you miss out that documentation comment you do indeed get Hello world.