hex values in textfield

dear sir,

i want to enter hex from 0000 to ffff in textfiled other characters is not allowed how to do it in textfield

dear sir,

i want to enter only hex values from 0000 to ffff in textfiled other characters is not allowed how to do it in textfield

one way -- use a JFormattedTextField with a mask formatter. Another way: use a JTextField, and add a DocumentFilter to its Document.