code: public void setValue (String name, boolean value)
      {
          Boolean oldValue = null;
          if (_prefs.get(name, null) != null || _props.getProperty(name) != null) {
              oldValue = Boolean.valueOf(_prefs.getBoolean(name, super.getValue(name, false)));
          }
  
          _prefs.putBoolean(name, value);
          _propsup.firePropertyChange(name, oldValue, Boolean.valueOf(value));
      }
docs: Sets the value of the specified preference, overriding the value defined in the
  configuration files shipped with the application.