AtmMachine.java

package ATM_MACHINE;

import java.util.*;
class ATM
{
    float Balance;
    int PIN=1234;

    public void checkpin()
    {
        System.out.println("Enter your pin: ");
        Scanner sc=new Scanner(System.in);
        int EnteredPin=sc.nextInt();
        if(EnteredPin==PIN)
        {
            menu();
        }
        else {
            System.out.println("Enter a valid pin : ");
            checkpin();
        }
    }

    public void menu()
    {
        System.out.println("Enter your choice- ");
        System.out.println("1. Check A/C balance :");
        System.out.println("2. Withdraw money : ");
        System.out.println("3. Deposit money : ");
        System.out.println("4. Exit ");

        Scanner sc=new Scanner (System.in);
        int opt=sc.nextInt();
        if(opt==1)
        {
            checkBalance();
        } else if (opt==2) {
            withdrawMoney();

        } else if (opt==3) {
            depositMoney();
        } else if (opt==4) {
            return;
        }
        else {
            System.out.println("Enter a valid choice");
        }

    }
    public void checkBalance()
    {
        System.out.println("Balance : "+Balance);
        menu();
    }
    public void withdrawMoney()
    {
        System.out.println("Enter amount to withdraw : ");
        Scanner sc=new Scanner(System.in);
        float amount=sc.nextFloat();
        if(amount>Balance)
        {
            System.out.println("Insufficient amount");
        }
        else {
            Balance=Balance-amount;
            System.out.println("Money withdrawn successfully ");
        }
        menu();
    }
    public void depositMoney()
    {
        System.out.println("Enter the amount : ");
        Scanner sc=new Scanner(System.in);
        float amount=sc.nextFloat();
        Balance=Balance+amount;
        System.out.println("Money deposited successfully!");
        menu();
    }

}

public class AtmMachine {
    public static void main(String[] args)
    {
        ATM obj= new  ATM();
        obj.checkpin();
    }
}