Java class 4 Feb DA5 Q3

package lab_class_04_Feb_ex5_q3;

import java.util.*;

public class Devansh20BCE0410 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner ReadInput = new Scanner(System.in);
        ArrayList<customer> Customers = new ArrayList<customer>();
        int choice;
        boolean flag = true;
        while(flag) {
            // Menu
            System.out.println("\n\t  Welcome to Example Bank!\n\tBy Devansh Sehgal 20BCE0410\n");
            System.out.println("1. Open an account");
            System.out.println("2. Deposit money");
            System.out.println("3. See account details");
            System.out.println("4. Change address");
            System.out.println("5. Change phone number");
            System.out.println("6. Change email ID");
            System.out.println("7. View all costumers (requires admin accesss)");
            System.out.println("8. Generate list (requires admin accesss)");
            System.out.println("9. Exit");
            System.out.print(">> ");

            choice = ReadInput.nextInt();
            int index;
            // switch
            switch(choice) {
            case 1:
                // Create account
                Customers.add(new customer());
                break;
            case 2:
                // Deposit
                index = login(Customers);
                if (index >= 0) {
                    Customers.get(index).deposit();
                }
                break;
            case 3:
                // Show Account details
                index = login(Customers);
                if (index >= 0) {
                    Customers.get(index).showCustomer();
                }
                break;
            case 4:
                // Change Address
                index = login(Customers);
                if (index >= 0) {
                    Customers.get(index).changeAddress();
                }
                break;
            case 5:
                // Change phone number
                index = login(Customers);
                if (index >= 0) {
                    Customers.get(index).changePhone();
                }
                break;
            case 6:
                // Change email
                index = login(Customers);
                if (index >= 0) {
                    Customers.get(index).changeEmail();
                }
                break;
            case 7:
                // view all customers
                if (customer.adminLogin()) {
                    for (customer c : Customers) {
                        System.out.println();
                        c.showCustomer();
                    }
                }
                break;
            case 8:
                // Generate list
                if (customer.adminLogin()) {
                    System.out.println("Input max balance:");
                    float maxBalance = ReadInput.nextFloat();
                    for (customer c : Customers) {
                        if (c.getBalance() <= maxBalance) {
                            System.out.println();
                            c.showCustomer();
                        }
                    }
                }
                break;
            case 9:
                flag = false;
                break;
            default:
                System.out.println("Invalid choice, try again!");
                break;
            }

        }

        System.out.println();
        System.out.println("\tThank you for using our service!");

        ReadInput.close();
    }

    static int login(ArrayList<customer> Customers) {
        Scanner login_sc = new Scanner(System.in);
        System.out.println("\nInput ID:");
        String id = login_sc.nextLine();
        System.out.println("\nInput PIN:");
        String pin = login_sc.nextLine();

        for(customer c : Customers) {
            if (id.equals(c.getID())) {
                if (c.checkPIN(pin)) {
                    return Customers.indexOf(c);
                }
                else {
                    System.out.println("Wrong PIN!");
                    return -1;
                }
            }
        }

        System.out.println("Customer not found!");
        return -1;
    }
}

class customer{
    private static String adminID = "Admin";
    private static String adminPass = "1234";

    protected String ID;
    protected String email;
    private String pin;
    protected float balance;
    protected String address;
    protected String phone;

    public customer() {
        Scanner openacc_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Input ID:");
        this.ID = openacc_sc.nextLine();
        System.out.println("Input PIN:");
        this.pin = openacc_sc.nextLine();
        System.out.println("Input email:");
        this.email = openacc_sc.nextLine();
        System.out.println("Input Address:");
        this.address = openacc_sc.nextLine();
        System.out.println("Input phone number:");
        this.phone = openacc_sc.nextLine();
        System.out.println("Input initial balance:");
        this.balance = openacc_sc.nextFloat();
        System.out.println("\nAccount Created!");
    }

    public String getID() {
        return this.ID;
    }

    public float getBalance() {
        return this.balance;
    }

    public boolean checkPIN(String pin) {
        return this.pin.equals(pin);
    }

    public void deposit() {
        Scanner deposit_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Current Balance: " + this.balance);
        System.out.println("\nInput deposit amount: ");
        this.balance += deposit_sc.nextFloat();
        System.out.println("\nAmount Deposited!\nNew Balance: " + this.balance);
    }

    public void changeAddress() {
        Scanner chAdd_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Old Address:");
        System.out.println(this.address);
        System.out.println("\nInput new address:");
        this.address = chAdd_sc.nextLine();
        System.out.println("\nAddress changed!");
    }

    public void changePhone() {
        Scanner chPh_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Old phone number:");
        System.out.println(this.phone);
        System.out.println("\nInput new phone number:");
        this.phone = chPh_sc.nextLine();
        System.out.println("\nPhone number changed!");
    }

    public void changeEmail() {
        Scanner chEm_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Old email:");
        System.out.println(this.email);
        System.out.println("\nInput new email:");
        this.email = chEm_sc.nextLine();
        System.out.println("\nEmail changed!");
    }

    public void showCustomer() {
        System.out.println();
        System.out.println("ID: " + this.ID);
        System.out.println("Email: " + this.email);
        System.out.println("Phone: " + this.phone);
        System.out.println("Address: " + this.address);
        System.out.println("Balance: " + this.balance);
    }

    public static boolean adminLogin() {
        Scanner adminLogin_sc = new Scanner(System.in);
        System.out.println();
        System.out.println("Input Admin ID:");
        String inp_id = adminLogin_sc.nextLine();
        System.out.println("Input Admin password:");
        String inp_pin = adminLogin_sc.nextLine();

        if (adminID.equals(inp_id) && adminPass.equals(inp_pin)) {
            return true;
        }
        else {
            System.out.println("Admin Login Failed!");
            return false;
        }
    }
}