Help with create a method in the bank class such as checkSSN(int ssn) that is checking if ssn is already present in the system and if the system has a ssn it will send false else true, how would that method look? Thanks!

Below java code is from the swith/case main class

Problem: If user by mistake enter a ssn that's already exists, shall not be possible.

switch (choice) {

case 1: {

while(true) {

System.out.print("Enter customer unique ssn: ");

ssn = sc.nextInt();

if(bank.checkSsn(ssn)){

break;

}

else{

System.out.println("Please enter a unique ssn:");

}

}

System.out.print("Enter customer name: ");

sc.nextLine();

String name = sc.nextLine();

Customer customer = new CustomerBuilder().setSsn(ssn).setName(name).createCustomer();

Bank.addCustomer(customer);

System.out.println(" Customer added successfully with uniquely ssn: " + customer.getSSN());

}

break;