Java Language Preferences Removing event listeners

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Example

Event listeners can be removed again from any Properties node, but the instance of the listener has to be kept around for that.

Java SE 8
Preferences preferences = Preferences.userNodeForPackage(getClass());

PreferenceChangeListener listener = evt -> {
    System.out.println(evt.getKey() + " got new value " + evt.getNewValue());
};
preferences.addPreferenceChangeListener(listener);

//
// later...
//

preferences.removePreferenceChangeListener(listener);
Java SE 8
Preferences preferences = Preferences.userNodeForPackage(getClass());

PreferenceChangeListener listener = new PreferenceChangeListener() {
    @Override
    public void preferenceChange(PreferenceChangeEvent evt) {
        System.out.println(evt.getKey() + " got new value " + evt.getNewValue());
    }
};
preferences.addPreferenceChangeListener(listener);

//
// later...
//

preferences.removePreferenceChangeListener(listener);

The same applies for NodeChangeListener.



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