The main window of DrJava allows users to start writing conde in java language. 

The menu of DrJava allows users to copy, cut or paste differnet portions of code or even access the Preferences menu. 

The Tools menu of DrJava allows users to compile or to test Java written documents. 

The Preferences window of DrJava allows users to customize the resource locations by changing them after their likings. 

The Debuger feature in the Preferences window allows users to add or remove the source path. 

The Notifications feature in the Preferences window of DrJava allows users to check or uncheck different options such as Promt Before Quit.