Setting Upper Bound for a Number in JFormatterTextfield in Java

Question

Hi All,

I want to set upper bound for a number in formatter textfield. Let's say that there is a string which has following format:

036 12' 23.67"

The first number must be less than 180, so when the user tries to type a number greater than 180, it must be masked. I used MaskFormatter to format string as above, but I couldn't set an upper bound for the first number. How can I achieve this. Thanks.

Answer 1

I don't know how to do this directly with a JFormattedTextField.

One solution is to use an InputVerifier so that when the user tabs away they will get an error message and focus is returned to the text field.

Another approach is to add a DocumentFilter to the AbstractDocument. Then you can edit the text before it is added to the Document. Read the section from the Swing tutorial on Text Component Features for more information.