void touch(boolean openReadOnly) throws IOException {
  if (isReadOnly || openReadOnly) {
    throw new IOException("Read only");
  }
  lastModified=System.currentTimeMillis();
}

void touch ( boolean openReadOnly ) throws IOException { if ( isReadOnly || openReadOnly ) { throw new IOException ( "Read only" ) ; } lastModified = System . currentTimeMillis ( ) ; }
update the last modified time .
