BankSystem.java

import java.util.Scanner;


  public class BankSystem {
  public static void main(String[] args) {
    String nameAndSurname= "Kubra Temur";
    int truePassword=125355;
    int currentBalance=50000;
    
   
    System.out.println("Welcome to bestBank"+ " "+ nameAndSurname + " " +"please log in");
    Scanner scan = new Scanner(System.in);
    if(logIn(truePassword)){
         while(true){
         showMenu();
    
        System.out.println("please enter the number correspondes to the operation that you want to perform");
        int choice = scan.nextInt();
         
        switch(choice){

        case 1:
           currentBalance= viewBalance(currentBalance);
            break;
        case 2:
            System.out.println("Please enter an amount:");
            int amount=scan.nextInt();
            currentBalance=withDraw(currentBalance, amount);
            break;
        case 3:
            System.out.println("Please enter an amount:");
            int amount2=scan.nextInt();
            currentBalance=deposit(currentBalance, amount2);    
            break;
        case 4:
            System.out.println("Logging out completed successfully.");
            return;
            default:
                System.out.println("Invalid operation number");
                
        }
        
    }
}

    else{
        System.out.println("Password is incorrect!");
    }


}
public static void showMenu(){
        System.out.println("---------MENU------------");
        System.out.println("1.View balance");
        System.out.println("2.Withdraw");
        System.out.println("3.Deposit");
        System.out.println("4.Exit");

}
public static boolean logIn (int truePassword){
 Scanner scan = new Scanner(System.in);
 System.out.println("Please enter your password:");
 int password=scan.nextInt();
    if(password==truePassword){
        return true;
    }
     else 
        return false;
}

public static int viewBalance(int currentBalance){
System.out.println("Your current balance is:"+ currentBalance);
return currentBalance;

}

public static int withDraw(int currentBalance,int amount){
    if(amount>currentBalance){
        System.out.println("Insufficient funds");
        return currentBalance;
    }
    currentBalance-=amount;
    System.out.println("Operation successfull new balance is :" + currentBalance);
    return currentBalance;
    
}
public static int deposit(int currentBalance,int amount){
    currentBalance+=amount;
    System.out.println("Operation successfull new balance is :" + currentBalance);
    return currentBalance;
}

    
}