Characters you can use in the formatting mask : JFormattedTextField « Swing « Java Tutorial

Character	Description
#	Any valid number (Character.isDigit).
'(single quote)	Escape character, used to escape any of the special formatting characters.
U	Any character (Character.isLetter). All lowercase letters are mapped to uppercase.
L	Any character (Character.isLetter). All uppercase letters are mapped to lowercase.
A	Any character or number (Character.isLetter or Character.isDigit).
?	Any character (Character.isLetter).
*	Anything.
H	Any hex character (0-9, a-f or A-F).

14.18.JFormattedTextField
	14.18.1.	JFormattedTextField
	14.18.2.	Characters you can use in the formatting mask
	14.18.3.	JFormattedTextField focus lost behaviour
	14.18.4.	JFormattedTextField with SimpleDateFormat
	14.18.5.	Using DefaultFormatterFactory to create Date format
	14.18.6.	Formatted Date and Time Input: DateFormat.SHORT
	14.18.7.	Formatted Date and Time Input: DateFormat.FULL, Locale.US
	14.18.8.	Formatted Date and Time Input: DateFormat.MEDIUM, Locale.ITALIAN
	14.18.9.	Formatted Date and Time Input: new SimpleDateFormat(E, Locale.FRENCH)
	14.18.10.	Formatted Date and Time Input: DateFormat.getTimeInstance(DateFormat.SHORT)
	14.18.11.	Formatted Numeric Input: NumberFormat.getCurrencyInstance(Locale.UK)
	14.18.12.	Formatted Numeric Input: NumberFormat.getInstance()
	14.18.13.	Formatted Numeric Input: NumberFormat.getIntegerInstance(Locale.ITALIAN)
	14.18.14.	Formatted Numeric Input: NumberFormat.getNumberInstance(Locale.FRENCH)
	14.18.15.	Formatted Numeric Input: Raw Number
	14.18.16.	Adding ActionListener to JFormattedTextField
	14.18.17.	It implements a mortgage calculator that uses four JFormattedTextFields
	14.18.18.	Using Actions with Text Components: JFormattedTextField
	14.18.19.	Creating a Text Field to Display and Edit a Phone Number
	14.18.20.	Creating a Text Field to Display and Edit a social security number
	14.18.21.	A decimal number with one digit following the decimal point;
	14.18.22.	A BigDecimal object custom formatter
	14.18.23.	Dynamically change the format
	14.18.24.	Support a date with the custom format: 2009-1-1
	14.18.25.	Customizing a JFormattedTextField Look and Feel
	14.18.26.	Make custom Input Text Formatter for JFormattedTextField