ATM_Interface.java

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package AtmInterface;

import java.util.InputMismatchException;
import java.util.Scanner;

class BankAccount{
    private int balance;

    public BankAccount(int initialAmount){
        this.balance = initialAmount;
    }

    public int balance(){
        return balance;
    }

    public void deposit(int amount){
        if (amount > 0){
            balance += amount;
            System.out.println("Deposit of " + amount + "Rs was successfull");
        } else {
            System.out.println("Invalid entry!. Please choose a number above 0");
        }
    }

    public void withdraw(int amount){
        if (amount > 0 && amount <= balance){
            System.out.println("Withdraw successfull of "+amount+"Rs");
            balance -= amount;
        } else {
            System.out.println("Invaid entry!!.Insuffucient balance or negative value entered");
        }
    }
}

class ATM{
    
    private BankAccount account;
    public ATM(BankAccount account) {
        this.account = account;
    }
    
    public void display(){
        System.out.println("Select Options : ");
        System.out.println("1, Deposit");
        System.out.println("2, Withdraw");
        System.out.println("3, Check Balance");
        System.out.println("4, Leave");
    }
    
    public void run(){
        Scanner sc = new Scanner(System.in);
        int option;
        try{
            do{
                display();
                System.out.println("Pick an option");
                option = sc.nextInt();
                
                switch (option){
                    case 1:
                        System.out.println("Enter amount to deposit");
                        int depositAmount = sc.nextInt();
                        account.deposit(depositAmount);
                        break;
                    case 2:
                        System.out.println("Enter amount to withdraw");
                        int withdrawAmount = sc.nextInt();
                        account.withdraw(withdrawAmount);
                        break;
                    case 3:
                        System.out.println("Current balance " + account.balance());
                        break;
                    case 4:
                        System.out.println("Thanks for working with State Bank");
                        break;
                    default:
                        System.out.println("Invalid entry!!. Enter only the given options");   
                }
            }while (option != 4);
            sc.close();
        }
        catch(InputMismatchException ex){
            System.out.println("Only up to Rs 50,000 can be transacted in a day.");
            ex.printStackTrace();
        }
    }
}
public class Main {
     public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BankAccount userAccount = new BankAccount(30000);
        ATM atm = new ATM(userAccount);
        System.out.println("Enter Your PIN : ");
        int pin = sc.nextInt();
        if (pin == 1234) {
            atm.run();
        } else {
            System.out.println("Wrong pin");
        }
    }
}