public class BankAccount
{
    private double balance;        // Notice PRIVATE access

    public BankAccount(double x)
    {
        balance = x;
    }

    public double getBalance()
    {
        return balance;
    }
    
    public void deposit(double amount)
    {
        balance = balance + amount;
    }
    
    public void withdraw(double amount) 
    {
        balance = balance - amount;
    }
}