import javax.swing.JOptionPane;

public class BankAccount
{
/* we want to be able to:
 * - deposit money
 * - withdraw money
 * - get the balance
 */ 
// INSTANCE VARIABLE:
private double balance;

// CONSTRUCTOR:
// initializes any instance variables you want to initialize
// it has the same name as the class
public BankAccount()
{   balance = 0;    
}

// public - other methods can call this method
// void - the method has no return statement
// amount - parameter
public void deposit(double amount)
{   balance = balance + amount;
    // shorthand: balance += amount;
}

public void withdraw(double amount)
{   balance = balance - amount;
    // shorthand: balance -= amount;
}

// the "double" indicates that the method returns a double
public double getBalance()
{   return balance;
}
    
    public static void main(String[] args)
    {   BankAccount harrysChecking = new BankAccount();
        harrysChecking.deposit(2240.59);
        harrysChecking.withdraw(500);
        // this line has an example of storing a result returned by a method:
        double currentBalance = harrysChecking.getBalance();
        String msg = "Current balance: " + currentBalance;
        JOptionPane.showMessageDialog(null, msg);
    }
}