How to restrict inputs in jtextfield strictly to double values?

Question

I am coding a gui and I wanted to use JFormattedTextField to verify my Input as double value, but the amountFormatter does not give me the right input I typed in back. So I tried to create an own Formatter with ("##########") which gives me a number with 10 digits, BUT i cannot verify double values(because they usually have a '.' in it)...

So my question is: How to simply verify double Values with Jformatted TextFields, or is there a much easier way with another Swing Component?

UPDATE Thx for your great answers!!! But is there possibly a solution with JFormatted TextField?

Answer 1

I've implemented number fields based on JFormattedTextField.

They also support a min and a max value.

Maybe you find them useful (the library is open source):

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JRealNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JDoubleField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JFloatField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedRealNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedDoubleField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedFloatField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JWholeNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JByteField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JIntegerField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLongField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JShortField.html

Tutorial:

http://softsmithy.sourceforge.net/lib/docs/tutorial/swing/number/index.html

More info:

http://puces-blog.blogspot.ch/2012/07/news-from-software-smithy-version-02.html

Homepage:

http://www.softsmithy.org

Download:

http://sourceforge.net/projects/softsmithy/files/softsmithy/

Maven:

<dependency>  
    <groupId>org.softsmithy.lib</groupId>  
    <artifactId>softsmithy-lib-core</artifactId>  
    <version>0.2</version>   
</dependency>   

Answer 2

• this is basic reason for why JFormattedTextField is there,

• set proper number formatter for JFormattedTextField, and /or with Locale too

• possible for JSpinner and JFormmatedTextField too

EDIT

you can start with

NumberFormat format = NumberFormat.getNumberInstance();
format.setGroupingUsed(false);
format.setGroupingUsed(true);// or add the group chars to the filter
format.setMaximumIntegerDigits(10);
format.setMaximumFractionDigits(2);
format.setMinimumFractionDigits(5);
format.setRoundingMode(RoundingMode.HALF_UP);