question: public void fireVisibleDataPropertyChange ( ) { firePropertyChange ( AccessibleContext . ACCESSIBLE_VISIBLE_DATA_PROPERTY , Boolean . valueOf ( false ) , Boolean . valueOf ( true ) ) ; }
target:  Fire a visible data property change notification. A 'visible' data property is one that represents something about the way the component appears on the display, where that appearance isn't bound to any other property. It notifies screen readers  that the visual appearance of the component has changed, so they can notify the user.