BankingApplication

package Banking;

import java.util.Scanner;

public class BankingApplication {
    public static void main(String[] args) {

        BankAccount obj1 = new BankAccount("XYZ","BA0001");
        obj1.showMenu();

    }
}

class BankAccount{
    int balance;
    int previousTransaction;
    String customerName;
    String customerId;

    BankAccount(String cname,String cid){
        customerName = cname;
        customerId = cid;
    }

    void deposit(int amount){
        if (amount != 0){
            balance = balance + amount;
            previousTransaction = amount;
        }
    }

    void withdraw(int amount){
        if(amount != 0){
            balance = balance - amount;
            previousTransaction = -amount;
        }
    }

    void getPreviousTransaction(){
        if(previousTransaction > 0){
            System.out.println("Deposited: " + previousTransaction);
        }
        else if(previousTransaction < 0){
            System.out.println("Withdraw: " + Math.abs(previousTransaction));
        }
        else{
            System.out.println("No transaction occured");
        }
    }
    void showMenu(){
        char option='\0';
        Scanner scanner = new Scanner(System.in);

        System.out.println("Welcome " + customerName);
        System.out.println("Your ID is " + customerId);
        System.out.println("\n");
        System.out.println("A. Check Balance");
        System.out.println("B. Deposit");
        System.out.println("C. Withdraw");
        System.out.println("D. Previous transaction");
        System.out.println("E. Exit");

        do{
            System.out.println("===============================================================");
            System.out.println("Enter an option");
            System.out.println("===============================================================");
            option = scanner.next().charAt(0);
            System.out.println("\n");

            switch(option){

                case 'A':
                    System.out.println("-------------------------------------------------------");
                    System.out.println("Balance = " + balance);
                    System.out.println("-------------------------------------------------------");
                    System.out.println("\n");
                    break;

                case 'B':
                    System.out.println("-------------------------------------------------------");
                    System.out.println("Enter an amount to deposit:");
                    System.out.println("-------------------------------------------------------");
                    int amount = scanner.nextInt();
                    deposit(amount);
                    System.out.println("\n");
                    break;

                case 'C':
                    System.out.println("-------------------------------------------------------");
                    System.out.println("Enter an amount to withdraw:");
                    System.out.println("-------------------------------------------------------");
                    int amount2 = scanner.nextInt();
                    withdraw(amount2);
                    System.out.println("\n");
                    break;

                case 'D':
                    System.out.println("-------------------------------------------------------");
                    getPreviousTransaction();
                    System.out.println("-------------------------------------------------------");
                    System.out.println("\n");
                    break;

                case 'E':
                    System.out.println("-------------------------------------------------------");
                    break;

                default:
                    System.out.println("Invalid Option. Please enter again");
                    break;
            }
        }while(option != 'E');
        System.out.println("Thank you for using our services");
    }
}