11.8 Exercise 9: Simple Editor
Write a Java application that:
Is a simple text editor.
The application should accept a name of a file from the command line.
It should create a window with a text control on it. The contents of the file should be loaded into this control.
The editor should provide a 'File' menu with the options 'Save' and 'Quit'.
The 'Save' option saves contents of the text control back to the file.
The 'Quit' option exits the application.
