question: public void close ( ) throws IOException { guard . close ( ) ; RandomAccessFile localRaf = raf ; if ( localRaf != null ) { synchronized ( localRaf ) { raf = null ; localRaf . close ( ) ; } if ( fileToDeleteOnClose != null ) { fileToDeleteOnClose . delete ( ) ; fileToDeleteOnClose = null ; } } }
target:  Closes this zip file. This method is idempotent. This method may cause I/O if the zip file needs to be deleted.