Search:

No, sorry. Have a look for the best section to post your question and start a new thread. Nobody will find your question in this thread.

No way. You'd have to rewrite the VM and compiler. There is no need to do such a thing.

Those are reserved words, an internal construct of the Java language. There is no implementation itself. You use it or you don't.
What are you actually trying to do?

JLS chapter 14.
Chapter*14.*Blocks and Statements