How to make invalid choice appear when you enter a wrong letter in Full Payment and Installment
import java.util.*; public class DecisionStructureSetA{ public static void main(String [] args){ String choice ; double fee = 45000,totalFee,totFee, monthlyFee, quarterlyFee; Scanner scan = new Scanner(System.in); System.out.println("*** TUITION FEE SIMULATION***"); System.out.println("[F] Full Paymaent"); System.out.println("[I] Installment"); System.out.print("Enter choice: "); choice = scan.next(); switch(choice){ case "F": case "f": System.out.println("***FULL PAYMENT***"); System.out.println("[1] Cash"); System.out.println("[2] Cheque"); System.out.print("Enter Choice: "); choice = scan.next(); switch(choice){ case "1": System.out.println("Thanks for paying in cash!"); totalFee = fee * .10; totFee = fee - totalFee; System.out.println("Your tution fee is:" + totFee); break; case "2": System.out.println("Your cheque payment would be clear in three days!"); break; default: System.out.print("Invalid