1) What you have downloaded, are you sure those are class files and not source files? If they are source (java) files, you will need to compile them.
2) I do not use Netbeans. In eclipse, even if I physically place some third party jar inside my project, I still need to explicitly need to add that jar to the class path. Does netbeans have anything similar?
Your question seems more to be IDE related than Swing related. I will move it over to the proper forum for you.
1) I have downloaded the jars which, in-turn, contains all of the class files needed. I have added the three needed jars to my library.
2) Yeah I'm considering just switching back to eclipse. I'm not entirely sure about the classpath, I'm doing some research now.