ternary statements

I am trying to extend this program so that if the user enters a customer reference number ending with D, they receive a discount beacuse they are paying by direct debit.

import java.util.Scanner;

publicclass electricitybill{

publicstaticvoid main(String args[]){

Scanner input =new Scanner(System.in);

finaldouble VAT = 0.05;

finaldouble OFFPEAK = 2.5;

finaldouble PEAK = 3.5;

int CustRefNum;

int PrevOffPeak, PresOffPeak;

int PrevPeak, PresPeak;

double PeakCost;

double OffPeakCost;

double TotalCost;

double TotalVAT;

System.out.println("Enter your Customer Reference Number");

CustRefNum = input.nextInt();

System.out.println("Enter your previous off peak rate");

PrevOffPeak = input.nextInt();

System.out.println("Enter your present off peak rate");

PresOffPeak = input.nextInt();

System.out.println("Enter your previous peak rate");

PrevPeak = input.nextInt();

System.out.println("Enter your present peak rate");

PresPeak = input.nextInt();

System.out.println("Customer Reference Number = " + CustRefNum);

System.out.println("Previous off peak rate = " + PrevOffPeak);

System.out.println("Present off peak rate = " + PresOffPeak);

System.out.println("Previous peak rate = " + PrevPeak);

System.out.println("Present peak rate = " + PresPeak);

OffPeakCost = (PresOffPeak - PrevOffPeak) * OFFPEAK;

PeakCost = (PresPeak - PrevPeak) * PEAK;

TotalCost = OffPeakCost + PeakCost;

TotalVAT = TotalCost * VAT;

GrandTotal = TotalCost + TotalVAT;

System.out.println("Off Peak Cost = " + OffPeakCost);

System.out.println("Peak Cost = " + PeakCost);

System.out.println("Total Cost = " + TotalCost);

System.out.println("Total VAT = " + TotalVAT);

System.out.println("Overall Total = " + GrandTotal);

This is what i have done so far but to be honest i am new to ternary statements.

finaldouble DDEBIT = 0.02;

double dDebit;

double DDTotal;

char letter;

letter ='D';

dDebit = CustRefNum.lastindexof('D') >-1 ? GrandTotal * DDEBIT : 0);

DDTotal = GrandTotal - dDebit;

System.out.println("Total cost of electricity bill with Discount is " + DDTotal);

Any help would be much appreciated.

[3724 byte] By [java535a] at [2007-11-26 20:17:06]