This is simple console-based mini Project : ATM

import java.util.Scanner;

public class ATM {
   static String userID = "sarthak3456";
   static String userPIN = "4321";
   static double balance = 1000.0;

   public ATM() {
   }

   public static void main(String[] var0) {
      Scanner var1 = new Scanner(System.in);
      System.out.println("Enter User ID: ");
      String var2 = var1.nextLine();
      System.out.println("Enter PIN: ");
      String var3 = var1.nextLine();
      if (validateUser(var2, var3)) {
         System.out.println("Login Successful!");

         int var4;
         do {
            System.out.println("\nATM Menu:");
            System.out.println("1. Check Balance");
            System.out.println("2. Deposit Money");
            System.out.println("3. Withdraw Money");
            System.out.println("4. Quit");
            System.out.print("Choose an option by choosing number: ");
            var4 = var1.nextInt();
            switch (var4) {
               case 1:
                  checkBalance();
                  break;
               case 2:
                  depositMoney();
                  break;
               case 3:
                  withdrawMoney();
                  break;
               case 4:
                  System.out.println("Thank you for using the ATM. Goodbye!");
                  break;
               default:
                  System.out.println("Invalid option, please try again.");
            }
         } while(var4 != 4);
      } else {
         System.out.println("Invalid User ID or PIN.");
      }

      var1.close();
   }

   public static boolean validateUser(String var0, String var1) {
      return userID.equals(var0) && userPIN.equals(var1);
   }

   public static void checkBalance() {
      System.out.println("\nYour current balance is: Rs" + balance);
   }

   public static void depositMoney() {
      Scanner var0 = new Scanner(System.in);
      System.out.print("\nEnter amount to deposit: ");
      double var1 = var0.nextDouble();
      if (var1 <= 0.0) {
         System.out.println("Please enter a valid amount.");
      } else {
         balance += var1;
         System.out.println("Successfully deposited $" + var1 + ". Your new balance is: Rs" + balance);
      }

   }

   public static void withdrawMoney() {
      Scanner var0 = new Scanner(System.in);
      System.out.print("\nEnter amount to withdraw: ");
      double var1 = var0.nextDouble();
      if (var1 <= 0.0) {
         System.out.println("Please enter a valid amount.");
      } else if (var1 > balance) {
         System.out.println("Insufficient balance. Try a smaller amount.");
      } else {
         balance -= var1;
         System.out.println("Successfully withdrawn Rs" + var1 + ". Your new balance is: Rs" + balance);
      }

   }
}