java atm program

Hey, Welcome to the practice house. You should be happy that you have found your program. No matter what happened the thing is here we are to learn how to write a very simple program for ATM Machine. If you are looking for some kind of advanced program please follow my next post. In this java tutorial, we will use only if-else statement and all our functionality is one way. If you noticed enough then you will find another if condition under withdraw option.

We have this condition because we want to check the withdrawal amount the user has given us it should not exceed the balance user have. Congratulations, You have the idea now how to write this kind of program. We can write a more advanced program with the same concept with more functionality.

So if you got the idea take it as a challenge and do it. If you have any questions or advice or request please let me know. I really love to answer your query. I love to explore new technologies. If you like my tutorials please share your thoughts about my work. You also can connect with me via social media. What Are We Gonna Explore. Scanner. Please Try Again". Welcome to AA Bank Limited. Account Name Holder : Ami Alif.

Please choose the following options. Your Current Balance is You have successfully deposited Now your balnce is Please Enter the Amount to Witdraw. You have successfully withdraw Insufficient Balance.The best ideas are the crazy ones.

If you have a crazy idea and it works, it's really valuable. Forum: Beginning Java. ATM Class. Kristina Hawkins. Hello everybody, I'm writing a simple code for ATM, but as I have never worked with a user's input, I'm not sure where to start.

Thank you! Junilu Lacar. I like Fantastic job with the formatting of your code! The classes appear to be well thought out and organized, too. Now as for how you'd tie everything together you might want to create another class, say an ATM class, to represent a bank customer's access point to the services of the bank that will be provided in some way by the classes you have defined. Don't take some of those instructions literally though because some of those method names mentioned in the instructions are not the same exact names you've used in your code; go by the intent because it's pretty easy to tell which one you really want to call.

Go get user input, well, you already have written a class to handle that so all you have to do is call an appropriate method of that class. Any help or tips would be greatly appreciated!!!

Swastik Dey. Looks great. Will it not be better if you create multiple BankCustomer objects and maintain a map where account number is the key and the object is the value, and ideally your verify or other helper methods should also change. You should first check whether the account number exists or not in the map, if exists the proceed with further operations.

Campbell Ritchie. I haven't read your code well enough to be sure the Map is the best way to implement things, but Maps have all sorts of methods to find the sort of numbers you want.

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This will give you the context; that's what you're missing and that's why you're confused. It's like somebody is telling you to "Jump three feet to your left!

java atm program

Right now! If they had yelled out instead, "You're about to get hit by a bus! The instruction to "use initialize method to add customers to HashMap" is like just telling you to jump three feet to your left.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I'm new to Java and have been reading Java for Dummies and other ones as well.

I've started building this program like a week ago. I'm sure it's very messy. Just seeing if someone can clean it up and show easier ways of doing things. I have like 4 classes, but I'll just post the main class and a subclass for now.

Floating point values are not precise. You should use BigDecimal s for the balance instead of double. Some useful reading:. If a user uses the application long enough they will get a StackOverflowError sooner or later.

You should use loops to get the user's input and don't call again recursively the menu printer method from the input handler. BankMain create new Scanner s in every method although it already has one in its input field. Comments like this are really hard to read on smaller screens because of the horizontal scrolling and the unnecessary spaces:.

It's often called as guard clause. Because of ATM constraint, all your constant values like 20, 40, 60, have to be in an Interface and never hard coded in an other place. Read, and try samples from Effective Java, this book is inevitablewith another one to understand Pattern Design Of all those that I was able to read, this is one who gave me the click, to understand the functioning of the design pattern : Head first Design Pattern.

It begins with Observer pattern. With it, you have to remove switch and other if revealing a way to think the solution for the future, and not transmit the problem to the objects build to solve them. With those two books you will avoid all beginner mistakes, and raise rapidly Java professionnal status.

Sign up to join this community. The best answers are voted up and rise to the top.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm doing an atm program and I'm having a hard time trying to figure out how to get it to actually deposit and withdraw.

Your class should not declare oldBalance, deposit, and withdrawal as global variables. The withdrawal method should not have access to the deposit variable and vice versa. It is a good programming practice to limit the scope of your variables as much as you can. Because a "deposit" variable is not really required outside this method, there is absolutely no reason to make it a global variable.

The same cannot be said about "current balance. Therefore, there is a good reason why to make it global Still, if you can solve the problem with less scope, you should do that. The simplest implementation of deposit and withdrawal is to simply add the user input to the currentBalance and save it in currentBalance.

You are never saving the current balance. When you do something like this:. All you are doing is to pass the values to the println method and not updating the variable that is supposed to hold the balance.

In fact, the first one should print false unless both deposit and oldBalance are zero. Because I am reusing currentBalance, I eliminated the need for an oldBalance variable. Learn more. Asked 5 years, 11 months ago. Active 3 years, 10 months ago. Viewed 32k times. Log out System. You're not changing the values of balance Active Oldest Votes.

Storing passwords

A few observations: Your class should not declare oldBalance, deposit, and withdrawal as global variables. I do not see why deposit and withdrawal need to return anything. When you do something like this: System. Full Running Code import java. Container; import java. FlowLayout; import java. GridLayout; import java. ActionEvent; import java. ActionListener; import java. WindowEvent; import java. WindowAdapter; import java.

IOException; import javax. JButton; import javax.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. First off, this was a project I worked on when I started getting into Java last summer and had an assignment that required us to write a simple ATM application. As I'm looking at the code a year later, and gained a bit more experience, I see where it could have been improved.

I'm sure there are going to be quite a bit of suggestions and feedback, but to start it off I'm looking the do while loop in the main program, and feel that the logic can be simplified such that the first or even second if statements can place outside of the loop as I feel that using all 3 can be redundant. The recommended approach for reading passwords is to use a char[] array, instead of a String.

The main reason for this, as explained in this SO answeris that immutable String s leave your passwords accessible until garbage collection GC kicks in, with a malicious process performing a memory dump of your Java process to do so. Helpfully, Console. Currently, you are hardcoding the account details as mere space-delimited String s.

This is not desirable from a data modeling perspective as it is non-trivial to:. With a class-based design, adding new fields or changing their data types is a lot easier. Now, we need a mechanism that knows how to interact with multiple accounts, and perform validation on picking an account.

An AccountManager sounds like one for the job:. The use of a List lets us store one, three, 10, or more accounts easily without having to deal with a multitude of variables.

How to create simple ATM machine using java programming

We also need to encrypt the password first, then rely on the Account. In this case, we no longer have to worry how to read space-delimited String s in order to identify the account name and password parts correctly. In order to help with the testing, you can create a TestAccountManager that override getAccounts to use some test data:. I thought it is They should be rewritten as such:. You have very similar ways of printing the balances in the displayBalancedeposit and withdrawal methods, differing only in the output.

This ties in with the use of a suitable model class as explained in the earlier section. For example:.

java atm program

With these methods, it simplifies how money is deposited or withdrawn from an Accountand how the balance can be shown:. Sign up to join this community. The best answers are voted up and rise to the top. Asked 4 years, 11 months ago.When used, this will show previews of multiple files within the same container and expose arrows to navigate between those files.

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ATM Machine Program in Java For Beginners

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