I have been reading current posts and found this site to be an excellent resource! I am currently revving up to study for SCJP. Here's my question, originally I had installed jdk 1.2 a while back to play with and when 1.4 came out ... I didn't know if I could install 1.4 on top of 1.2 or just uninstall the old and install the new. Does anyone know?