You may upload an arbitrary number of Java classes both in the source form (*.jav or *.java) and in the bytecode form (*.class).To avoid the restriction of no more then 4 simultaneosly uploaded files imposed by fill-out form (cf. page Regular work) you may zip them - be sure to use compatible zip.
It would be OK to upload only sources of Java classes may be in the zipped form. The only incovenience caused by this approach would be a great number (probably) of compilation errors detected not at your local computer but at the server. If you have written already your Java classes go to the Regular work now!
You simply need to download it from java.sun.com, to install it and to follow the next instructions.
genebee.zip
into your working directory (where the source of your Java class is placed).
Remember: you need not to unzip the package! javac -classpath genebee.zip;\jdk\java\lib\classes.zip;. MyCustomer.java
(last argument should be the name of your own Java source file of course!). Or add genebee.zip to your CLASSPATH environment variable.