question: public String toString ( ) { int val ; StringBuffer sb = new StringBuffer ( ) ; for ( int i = 0 ; i < _nDataBytes ; i ++ ) { if ( i > 0 ) { sb . append ( ' ' ) ; } val = _dataBytes [ i ] & 0xFF ; sb . append ( hexChars [ val > > 4 ] ) ; sb . append ( hexChars [ val & 0x0F ] ) ; } return sb . toString ( ) ; }
target:  Get a String representation of the entire message in hex