Next: Constructor methods. Up: Defining an object. Previous: The Account class.

Using Account

A one-account bank

Using the Account class we've defined, we can now put together a complete program using this Account object we created. We're going to create an additional class called VerySimpleBank - to allow us to work with a bank for which there is only one account. This class would be placed into a separate file, called VerySimpleBank.java.

import csbsju.cs160.*;

public class VerySimpleBank {
    public static void run() {
        Account mine = new Account();
        while(true) {
            IO.print("Balance: ");
            IO.println(mine.getBalance());
            IO.print("Deposit? ");
            mine.deposit(IO.readDouble());
        }
    }
}

A more complex bank

A one-account bank isn't very realistic. Instead, let's make a program that works with two accounts!

import csbsju.cs160.*;

public class SimpleBank {
    public static void run() {
        Account mine = new Account();
        Account yours = new Account();
        while(true) {
            Account a;
            IO.print("Which account? ");
            if(IO.readInt() == 0) a = mine;
            else                  a = yours;

            IO.print("Balance: ");
            IO.println(a.getBalance());
            IO.print("Deposit? ");
            a.deposit(IO.readDouble());
        }
    }
}

If we ran this program, we'd see the following.

Which account? 0       we select my account
Balance: 0.0             my account has $0 so far
Deposit? 5000
Which account? 1       we select your account
Balance: 0.0             your account has $0 so far
Deposit? 3
Which account? 0       we select my account
Balance: 5000.0          my account has $5000 so far
 : and so on

Next: Constructor methods. Up: Defining an object. Previous: The Account class.