How can I parse code to build a compiler in Java?

Question

I need to write a compiler. It\'s homework at the univ. The teacher told us that we can use any API we want to do the parsing of the code, as long as it is a good one. That way

Answer 1

I've used SableCC in my compiler course, though not by choice.

I remember finding it very bulky and heavyweight, with more emphasis on cleanliness than convenience (no operator precedence or anything; you have to state that in the grammar).

I'd probably want to use something else if I had the choice. My experiences with yacc (for C) and happy (for Haskell) have both been pleasant.