public int readInt() throws IOException {
  return ((_is.read() << 24) | (_is.read() << 16) | (_is.read() << 8)| (_is.read()));
}

public int readInt ( ) throws IOException { return ( ( _is . read ( ) << 24 ) | ( _is . read ( ) << 16 ) | ( _is . read ( ) << 8 ) | ( _is . read ( ) ) ) ; }
parses a 32 - bit int .
