question: public MonetaryFormat negativeSign ( char negativeSign ) { checkArgument ( ! Character . isDigit ( negativeSign ) ) ; checkArgument ( negativeSign > 0 ) ; if ( negativeSign == this . negativeSign ) return this ; else return new MonetaryFormat ( negativeSign , positiveSign , zeroDigit , decimalMark , minDecimals , decimalGroups , shift , roundingMode , codes , codeSeparator , codePrefixed ) ; }
target:  Set character to prefix negative values.