question: private void readObject ( ObjectInputStream s ) throws ClassNotFoundException , IOException , HeadlessException { GraphicsEnvironment . checkHeadless ( ) ; ObjectInputStream . GetField f = s . readFields ( ) ; scrollbarDisplayPolicy = f . get ( "scrollbarDisplayPolicy" , SCROLLBARS_AS_NEEDED ) ; hAdjustable = ( ScrollPaneAdjustable ) f . get ( "hAdjustable" , null ) ; vAdjustable = ( ScrollPaneAdjustable ) f . get ( "vAdjustable" , null ) ; wheelScrollingEnabled = f . get ( "wheelScrollingEnabled" , defaultWheelScroll ) ; }
target:  Reads default serializable fields to stream.