question: public QuarterDateFormat ( TimeZone zone , String [ ] quarterSymbols , boolean quarterFirst ) { ParamChecks . nullNotPermitted ( zone , "zone" ) ; this . calendar = new GregorianCalendar ( zone ) ; this . quarters = quarterSymbols ; this . quarterFirst = quarterFirst ; this . numberFormat = NumberFormat . getNumberInstance ( ) ; }
target:  Creates a new instance for the specified time zone.