Modify your Roman Numeral GUI so that it will be a complete JFrame with a menu bar and menus.
There should be two menus: one called File and another called Convert. The File menu should have the menu items Open and Quit. The Convert menu should have one menu item that says “Roman to Arabic”. When chosen, a dialog box should be displayed asking the user to type in a Roman numeral. After receiving the Roman numeral, another dialog box should display the Arabic value. If the Roman numeral is not valid (see below) a dialog box should say so.
You will need a handler for the File menu, and another handler for the Convert menu. As mentioned in lecture, be sure when opening a file with the file menu handler that your ask for the absolute path to the file rather than just its file name (getAbsolutePath() rather than getName()).
Create an exception for illegal Roman numerals
Create a class called Illegal Roman Numeral Exception that extends Illegal Argument Exception as shown in lecture. This exception should be thrown by the constructor of a Roman Numeral if there is an invalid the console, not placed in the GUI. This exception may be thrown when constructing a Roman numeral read from the file, or when trying to convert from Roman to Arabic.
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