You can add .java files, .jar files or any other data file (.gif, .txt, .jad, and so on) to your project. To add files, select the project to which you want to add the file by clicking the project name in the workspace view of the BlackBerry Java Development Environment (JDE). On the Project menu, click Add File to Project. The file selector appears. By changing the file type filter at the bottom of this window you can browse for and add any type of file.