Create a UI that has a field in which to enter text, a field to
display read-only text and a button. When the button is pressed,
take the value of the text box and try to create a month object. If
a number was entered, use the constructor that accepts an integer.
If alphabetic characters were entered, use the constructor that
accepts a string. If nothing is entered, use the no-argument
constructor. If a valid month object is created, use...