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I created a DoubleFormattedTextField class shows below and
new DoubleFormattedTextField("#.###", 0.0, 2.5);

I expect it commit when I enter between 0.0 and 2.5 everything else
less than or great than or not double such as "a string" should revert.
But it doesn't work that way. I entered -1.2, 3.5 or "hello world", they
all committed.
Can anyone out there tell me what I have missed?

Thank Q very much!

class DoubleFormattedTextField extends JFormattedTextField {
private static final long serialVersionUID = 1L;

private double minimum;
private double maximum;

public DoubleFormattedTextField(String format, double minimum, double
maximum) {
super(new DecimalFormat(format));
this.minimum = minimum;
this.maximum = maximum;

NumberFormat doubleFormat = DecimalFormat.getNumberInstance();
doubleFormat.setMinimumFractionDigits(3);
doubleFormat.setMinimumIntegerDigits(1);


NumberFormatter doubleFormatter = new NumberFormatter(doubleFormat);
doubleFormatter.setFormat(doubleFormat);
doubleFormatter.setMinimum(new Double(this.minimum));
doubleFormatter.setMaximum(new Double(this.maximum));

setFormatterFactory(new DefaultFormatterFactory(doubleFormatter));
setFocusLostBehavior(JFormattedTextField.COMMIT_OR _REVERT);

}
}

On Dec 12, 5:19 am, RC <raymond.c...@nospam.noaa.gov> wrote:
> I created a DoubleFormattedTextField class shows below and
> new DoubleFormattedTextField("#.###", 0.0, 2.5);
>
> I expect it commit when I enter between 0.0 and 2.5 everything else
> less than or great than or not double such as "a string" should revert.
> But it doesn't work that way. I entered -1.2, 3.5 or "hello world", they
> all committed.
> Can anyone out there tell me what I have missed?
>
> Thank Q very much!
>
> class DoubleFormattedTextField extends JFormattedTextField {
> private static final long serialVersionUID = 1L;
>
> private double minimum;
> private double maximum;
>
> public DoubleFormattedTextField(String format, double minimum, double
> maximum) {
> super(new DecimalFormat(format));
> this.minimum = minimum;
> this.maximum = maximum;
>
> NumberFormat doubleFormat = DecimalFormat.getNumberInstance();
> doubleFormat.setMinimumFractionDigits(3);
> doubleFormat.setMinimumIntegerDigits(1);
>
> NumberFormatter doubleFormatter = new NumberFormatter(doubleFormat);
> doubleFormatter.setFormat(doubleFormat);
> doubleFormatter.setMinimum(new Double(this.minimum));
> doubleFormatter.setMaximum(new Double(this.maximum));
>
> setFormatterFactory(new DefaultFormatterFactory(doubleFormatter));
> setFocusLostBehavior(JFormattedTextField.COMMIT_OR _REVERT);
>
> }
>
> }

The commit behavior of your class is normal and proper. If you want a
custom action on an invalid input, try override AbstractFoamatter
methods. Sorry I don't have enough time to try them. Or, InputVerifier
should also be useful.