Please modify the program below so that it is not case sensitive if the user ent

Question

Please modify the program below so that it is not case sensitive if the user enters a lowercase letter when choosing a seat. It should accept both. Example : 1A or 1a . Also, I would like the program to print an error message if the user enter a seat number that is not valid such as 1E or 10A. It should print, "That is not a valid choice! Please enter a different seat."

import java.util.Scanner;

public class Seat {
static char[][] seats = new char[9][4];
static String[][] userNames = new String[9][4];

public static void main(String[] args) {
@SuppressWarnings("resource")
       Scanner read = new Scanner(System.in);
for (int i = 0; i < 9; ++i) {
for (int j = 0; j < 4; ++j) {
seats[i][j] = (char) (j + 'A');
}
}
  
printSeatChart();

while (!isFull()) {
boolean validSeat = false;
int row = -1, col = -1;
String seatNumber = null;
while (!validSeat) {
System.out.print("Enter seat number: ");
seatNumber = read.nextLine();
row = seatNumber.charAt(0) - '0' - 1;
col = seatNumber.charAt(1) - 'A';
if (seats[row][col] == 'X') {
System.out.format("Seat number: %s cannot be reserved. Please select a different seat. ",
seatNumber);
} else validSeat = true;
}
System.out.format("Would you like to reserve %s? Y/N: ", seatNumber);
char userChoice = read.nextLine().toLowerCase().charAt(0);
if (userChoice == 'y') {
System.out.print("Enter your name: ");
String userName = read.nextLine();
userNames[row][col] = userName;
seats[row][col] = 'X';
System.out.format("Reservation of seat number: %s to: %s was successful. ",
seatNumber, userName);
printSeatChart();
}
}

System.out.println("We are sorry, there are no more seats available.");
}

private static void printSeatChart() {
for (int i = 0; i < 9; ++i) {
System.out.format("%d %c %c %c %c ",
(i + 1), seats[i][0], seats[i][1], seats[i][2], seats[i][3]);
}
}

private static boolean isFull() {
for (int i = 0; i < 9; ++i) {
for (int j = 0; j < 4; ++j) {
if (seats[i][j] != 'X') return false;
}
}
return true;
}
}

Explanation / Answer

Please go through the bold lines of the program where changes are made

import java.util.Scanner;

public class Seat1 {
    static char[][] seats = new char[9][4];
    static String[][] userNames = new String[9][4];

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner read = new Scanner(System.in);
        for (int i = 0; i < 9; ++i) {
            for (int j = 0; j < 4; ++j) {
                seats[i][j] = (char) (j + 'A');
            }
        }
      
        printSeatChart();

        while (!isFull()) {
            boolean validSeat = false;
            int row = -1, col = -1;
            String seatNumber = null;
            String ro="";
            while (!validSeat) {
                System.out.print("Enter seat number: ");
                seatNumber = read.nextLine().toUpperCase(); //convert to upper case
                System.out.println(seatNumber);
                int length = seatNumber.length(); // find length of string
              
                if(length>2) {
                   ro = ro + seatNumber.charAt(0);
                   ro = ro + seatNumber.charAt(1);
                   row = Integer.parseInt(ro);
                   col = seatNumber.charAt(2) - 'A';
                   System.out.println(row);
                } else {
                    row = seatNumber.charAt(0) - '0' - 1;
                    col = seatNumber.charAt(1) - 'A';
                }
             
                if(row>=10 || col>3) {
                   System.out.println("That is not valid choice please enter different seat");
                  
                }else if (seats[row][col] == 'X') {
                    System.out.format("Seat number: %s cannot be reserved. Please select a different seat. ",
                            seatNumber);
                } else validSeat = true;
            }
            System.out.format("Would you like to reserve %s? Y/N: ", seatNumber);
            char userChoice = read.nextLine().toLowerCase().charAt(0);
            if (userChoice == 'y') {
                System.out.print("Enter your name: ");
                String userName = read.nextLine();
                userNames[row][col] = userName;
                seats[row][col] = 'X';
                System.out.format("Reservation of seat number: %s to: %s was successful. ",
                        seatNumber, userName);
                printSeatChart();
            }
        }

        System.out.println("We are sorry, there are no more seats available.");
    }

    private static void printSeatChart() {
        for (int i = 0; i < 9; ++i) {
            System.out.format("%d %c %c %c %c ",
                    (i + 1), seats[i][0], seats[i][1], seats[i][2], seats[i][3]);
        }
    }

    private static boolean isFull() {
        for (int i = 0; i < 9; ++i) {
            for (int j = 0; j < 4; ++j) {
                if (seats[i][j] != 'X') return false;
            }
        }
        return true;
    }
}

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