Create a java small class for a bank account!!?

jon123 · #1 (**permalink**) 14-03-2010, 05:06 PM

I need to create a bank account class which consists of deposit and withdraw methods. I need to have a current account and savings account?

I also need help on how to extend it so I can ask the user to inpt their withdrawal amount and deposit and it gives out the balance using scanner funtion?

So far i have something like this, isit right?..

Java Code

public abstract class BankAccount {
private double balance;
public BankAccount() {
balance = 0.;
}
public void deposit(double amount) {
balance += amount;
}
public withdraw(double amount) {
// check...
balance -= amount;
}
}
public class CurrentAccount extends BankAccount {
// additional stuff
}
public class SavingsAccount extends BankAccount {
// aditional stuff
}

heronfisher · #2 (**permalink**) 15-03-2010, 06:33 AM

If I had to make a Bank Account class I would prefer the following interface:

Java Code

Class Bank Account{
	public Bank Account()
	public void withdraw(double amount)
	public void deposit(double amount)
	public Transaction getTransaction(int index)
	public int transactionCount()
	public double getCurrentBalance()
	private void addTransaction(Transaction t)
}

in my withdraw and deposit method I change the current Balance and I create a new Transaction and add it to the collection of Transactions (since I hate arrays, I would probably use one of the Collection-classes from the java.util package to store my transactions).
The Print Transaction and Read Transaction methods I would not place in the Bank Account-class, neither in my Transaction- class. It makes my classes depend on the UI. Prove of this is, I need to change lot of code in order to get things right.It's better to do this printing-logic in a class of its own or in your Application-class.

okello · #3 (**permalink**) 24-03-2010, 03:00 PM

My approach would be as follows:
1. I'd create an bank account interface with the two methods; withdraw and deposit:

Java Code

public interface BankAccount {
  
  private double bal;

  public void withdraw( double amount );
  public void deposit( double amount );
}

2. I'd create two two classes; for CurrentAccount and SavingsAccount that would implement the above interface, and polymorphically provide implementation for the two methods; withdraw and deposit:

Java Code

public class CurrentAccount implements BankAccount {

  public void deposit( double amount ) {
      this.bal += bal;
  }

  public withdraw( double amount ) {
    this.bal -= bal;
  }

}

I would repeat this for the savings account.

To track changes made, I would use an AOP framework to take care of policy changes in security, and things like that.

I hope this helps.

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The Following 2 Users Say Thank You to heronfisher For This Useful Post:
jon123 (15-03-2010), Json (15-03-2010)