How to undo changes on JSpinner?

Question

I need to validate the user input of a JSpinner, and if invalid, I need to undo (rollback) the value change. What is the best way to do it?

Answer 1

Well, if you save the old value from the last time you validated the input, you can then reset the value of the spinner back to the last valid value.

boolean valid = validate(spinner);
if (valid)
    validValue = spinner.getValue();
else
    spinner.setValue(validValue);

Maybe something like that.