To run a model file for Java from the COMSOL Desktop, compile it using the COMSOL compile command. This command is called comsolcompile on Windows® and comsol compile on other platforms. The compilation gets you a model class file corresponding to the model file for Java. Launch the model class file by selecting Open on the File menu, and selecting a Model Class File under File name.To create a standalone application using the COMSOL API, you need to develop a text-based or GUI-based interface to the functionality and compile it using the COMSOL compile command. The application can be run in standalone mode that links your Java® application directly to the COMSOL code (as a single process). You can also choose to run the application in client-server mode by connecting to a COMSOL Multiphysics server.To see options for compiling Java files, see The COMSOL Commands for your platform. For more comprehensive information about the COMSOL API, see the COMSOL Programming Reference Manual.