When you create your application and project file, the Applications Navigator should look like this:
Note that nodes in italics in the Applications Navigator mean that these elements have not yet been saved; however the application and project you created were saved automatically. A project node is bold when a file in the project is selected or open in an editor.
In JDeveloper, you use an application (first-level node below Applications) file to keep track of the projects (collections of related files) you use while developing your application. In the Applications Navigator, this application file acts as a parent node for all the contained projects.
Different projects might contain files representing different tiers of a multitier application, for instance, or different subsystems of a complex application. These files can reside in any directory and still be contained within a single project.
JDeveloper has the capability of recognizing many different file types and displaying each in its appropriate viewer or editor when you double-click the file in the Applications Navigator. Closing an application or project closes all open editors or viewers for files in that application or project and unloads the files from memory.
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