Java developers

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I've found a neat little database design tool written in Visual C++ that I'd like to port to Java as a learning exercise and to provide a similar tool to the office I work in which runs on a hybrid network. I'm taking a college class in Java and will be learning about GUIs next week, but one thing I was wondering is if there are any pre-built ERD or SQL generator classes that might help. Most of the built-in Java classes seem more oriented towards encapsulating pre-written SQL statements or passing them through a database server. I just want the program to allow for visual modeling of a database and an export to SQL. Anyone know of something that might help me?