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A link list system that manages a list of customer

Use a linked list to create a system for managing a list of customers waiting to buy the latest game console.Each customer has a unique name.The system should fulfill the following operations:
• Adding a customer in the start of the list
• Adding a customer in the end of the list
• Removing a customer from the start of the list
• Removing a customer from the end of the list
• Removing a customer by name
• Printing the current list
• Create attest program that allows the user to perform all operations with their own data.

Java Code

importjava.util.LinkedList;
importjava.util.Scanner;
public class CustomersListManagement {
    // Entry point of the program
public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
LinkedListcustomersList = new LinkedList<>();
while (true) {
System.out.println("Menu");
System.out.println("a. Add a customer in the start of the list");
System.out.println("b. Add a customer in the end of the list");
System.out.println("c. Remove a customer from the start of the list");
System.out.println("d. Remove a customer from the end of the list");
System.out.println("e. Remove a customer by name");
System.out.println("f. Print the current list");
System.out.println("x. Exit");
System.out.print("Option: ");
            String option = in.nextLine();
System.out.println();
if (option.equalsIgnoreCase("x")) {
break;
            }
if (option.equalsIgnoreCase("a")) {
                // Add a customer to front
System.out.print("Enter customer name: ");
                String name = in.nextLine().trim().toUpperCase();
if (name.isEmpty()) {
System.out.println("Error: A name is required.");
                } else if (customersList.contains(name)) {
System.out.println("Error: Name is already used.");
                } else {
customersList.addFirst(name);
System.out.println("Ok: '" + name + "' added.");
                }
            } else if (option.equalsIgnoreCase("b")) {
                // Add a customer to end
System.out.print("Enter customer name: ");
                String name = in.nextLine().trim().toUpperCase();
if (name.isEmpty()) {
System.out.println("Error: A name is required.");
                } else if (customersList.contains(name)) {
System.out.println("Error: Name is already used.");
                } else {
customersList.addLast(name);
System.out.println("Ok: '" + name + "' added.");
                }
            } else if(option.equalsIgnoreCase("c")) {
                // Remove front
if(customersList.isEmpty()) {
System.out.println("Error: The list is empty.");
                } else {
                    String name = customersList.removeFirst();
System.out.println("Ok: '" + name + "' removed.");
                }
            } else if(option.equalsIgnoreCase("d")) {
                // Remove back
if(customersList.isEmpty()) {
System.out.println("Error: The list is empty.");
                } else {
                    String name = customersList.removeLast();
System.out.println("Ok: '" + name + "' removed.");
                }
            } else if(option.equalsIgnoreCase("e")) {
                // Remove by name
System.out.print("Enter customer name: ");
                String name = in.nextLine().trim().toUpperCase();
if (name.isEmpty()) {
System.out.println("Error: A name is required.");
                } else if (!customersList.contains(name)) {
System.out.println("Error: Name is not in the list.");
                } else {
customersList.remove(name);
System.out.println("Ok: '" + name + "' removed.");
                }
            } else if(option.equalsIgnoreCase("f")) {
                // Print everything on list
for(String name : customersList) {
System.out.println(name);
                }
            } else if(option.equalsIgnoreCase("x")) {
break;
            }
System.out.println();
        }
    }
}

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