question: public void print ( PrintWriter output , int w , int d ) { DecimalFormat format = new DecimalFormat ( ) ; format . setDecimalFormatSymbols ( new DecimalFormatSymbols ( Locale . US ) ) ; format . setMinimumIntegerDigits ( 1 ) ; format . setMaximumFractionDigits ( d ) ; format . setMinimumFractionDigits ( d ) ; format . setGroupingUsed ( false ) ; print ( output , format , w + 2 ) ; }
target:  Print the matrix to the output stream.   Line the elements up in columns with a Fortran-like 'Fw.d' style format.