question: public final int readChar ( ) throws IOException { if ( _readEncoding != null ) { int ch = _readEncoding . read ( ) ; return ch ; } if ( _readLength <= _readOffset ) { if ( ! readBuffer ( ) ) return - 1 ; } return _readBuffer [ _readOffset ++ ] & 0xff ; }
target:  Reads a character from the stream, returning -1 on end of file.