Files in the IDE are managed through the Explorer window. To make a file available for use in the IDE and visible in the IDE, you must have the file's source tree mounted in the IDE as a filesystem. For more information on working with filesystems and files in the IDE, follow these links:
Filesystems and the Java Classpath
Mounting a Filesystem
Configuring a Mounted Filesystem
Managing Objects in the IDE
The Explorer
Node Icons in the Explorer
Properties Window
Opening a File in the IDE
Creating a New File
Creating or Deleting a Package
File Searches