What are you talking about? A class file is created when you compile your Java source code. This isn't only the case with Delta and Hyperion; this is how it works for all Java programs lol. If you cannot find the class files, and assuming you've compiled correctly, try searching in the 'bin' (binary) folder, which is the default output folder for Eclipse. If you don't know how to create a class file, click your project and go to new -> class file. A search engine is probably your best friend in this situation. :-)