Bankapp.java

import java.util.Scanner;

public class BankApplication {

    public static void main(String[] args) {

        Scanner sc=new Scanner(System.in);

        System.out.println("Enter your 'Name' and 'CustomerId' to access your Bank account:");

        String name=sc.nextLine();

        String customerId=sc.nextLine();

        BankAccount obj1=new BankAccount(name,customerId);

        obj1.menu();

    }

}

class BankAccount{

    double bal;

    double prevTrans;

    String customerName;

    String customerId;

    BankAccount(String customerName,String customerId){

        this.customerName=customerName;

        this.customerId=customerId;

    }

    void deposit(double amount){

        if(amount!=0){

            bal+=amount;

            prevTrans=amount;

        }

    }

    void withdraw(double amt){

        if(amt!=0 && bal>=amt){

            bal-=amt;

            prevTrans=-amt;

        }

        else if(bal<amt){

            System.out.println("Bank balance insufficient");

        }

    }

    void getPreviousTrans(){

        if(prevTrans>0){

            System.out.println("Deposited: "+prevTrans);

        }

        else if(prevTrans<0){

            System.out.println("Withdrawn: "+Math.abs(prevTrans));

        }

        else{

            System.out.println("No transaction occured");

        }

    }

    void menu(){

        char option;

        Scanner sc=new Scanner(System.in);

        System.out.println("Welcome "+customerName);

        System.out.println("Your ID:"+customerId);

        System.out.println("\n");

        System.out.println("a) Check Balance");

        System.out.println("b) Deposit Amount");

        System.out.println("c) Withdraw Amount");

        System.out.println("d) Previous Transaction");

        System.out.println("e) Exit");

        do{

            System.out.println("********************************************");

            System.out.println("Choose an option");

            option=sc.next().charAt(0);

            System.out.println("\n");

            switch (option){

                case 'a':

                    System.out.println("......................");

                    System.out.println("Balance ="+bal);

                    System.out.println("......................");

                    System.out.println("\n");

                    break;

                case 'b':

                    System.out.println("......................");

                    System.out.println("Enter a amount to deposit :");

                    System.out.println("......................");

                    double amt=sc.nextDouble();

                    deposit(amt);

                    System.out.println("\n");

                    break;

                case 'c':

                    System.out.println("......................");

                    System.out.println("Enter a amount to Withdraw :");

                    System.out.println("......................");

                    double amtW=sc.nextDouble();

                    withdraw(amtW);

                    System.out.println("\n");

                    break;

                case 'd':

                    System.out.println("......................");

                    System.out.println("Previous Transaction:");

                    getPreviousTrans();

                    System.out.println("......................");

                    System.out.println("\n");

                    break;

                case 'e':

                    System.out.println("......................");

                    break;

                default:

                    System.out.println("Choose a correct option to proceed");

                    break;

            }

        }while(option!='e');

        System.out.println("Thank you for using our banking services");

    }

}