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Groups > comp.lang.java.programmer > #30544

Re: Problem with JavaFX ChangeListener?

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On 12/11/2014 15:36, Arne Vajhøj wrote:
> On 12/11/2014 6:08 PM, Knute Johnson wrote:
>> I'm trying to teach myself JavaFX and have hit a snag.  In the program
>> below I add a ChangeListener to a TextField.  The Java8 method works
>> fine, adding an anonymous ChangeListener class works fine but I can't
>> create a class that implements ChangeListener and get it to compile.
>
>>          class LengthListener<String> implements ChangeListener<String> {
>                                 ^^^^^^^^ remove this (it has a very bad
> impact when String is used later!)
>>              private final int length;
>>
>>              public LengthListener(int length) {
>>                  this.length = length;
>>              }
>>
>>              @Override public void changed(
>>               ObservableValue<? extends String> observable,
>>               String oldValue,String newValue) {
>>                  if (newValue.length() > length)
>>                      ((StringProperty)observable).setValue(
>>                       newValue.substring(0,length));
>>              }
>>          }
>>          textField.textProperty().addListener(new LengthListener(4));
>
> Arne
>
>

Thanks Arne, that was why it wouldn't compile!

-- 

Knute Johnson

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Thread

Problem with JavaFX ChangeListener? Knute Johnson <eternal@knutejohnson.com> - 2014-12-11 15:08 -0800
  Re: Problem with JavaFX ChangeListener? Arne Vajhøj <arne@vajhoej.dk> - 2014-12-11 18:36 -0500
    Re: Problem with JavaFX ChangeListener? Knute Johnson <eternal@knutejohnson.com> - 2014-12-11 15:53 -0800
  Re: Problem with JavaFX ChangeListener? Arne Vajhøj <arne@vajhoej.dk> - 2014-12-11 21:24 -0500
    Re: Problem with JavaFX ChangeListener? Knute Johnson <eternal@knutejohnson.com> - 2014-12-11 18:31 -0800
  Re: Problem with JavaFX ChangeListener? Roedy Green <see_website@mindprod.com.invalid> - 2014-12-31 18:23 -0800
    Re: Problem with JavaFX ChangeListener? Joerg Meier <joergmmeier@arcor.de> - 2015-01-01 12:39 +0100

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