I got an assignment recently and for now I have only one question. As far as I understood I may use for development jdk1.4.(something latest) and jdk1.5.0. But the question is, what should I do with some code differencies between two platforms. Is it permitted to use some Java 5 specific code and language features? (like asserts, templates and new concurrency classes)
of course. As long as you state you're using 1.5 you can use the full force of the platform. If you state you're using 1.4 of course you can't use any of the new features as your sources are supposed to compile with a 1.4 compiler and the classes to run on a 1.4 runtime (which 1.5 compiled classes won't).