class CheckingAccount extends Account
{
Money serviceCharge;

CheckingAccount(Money initialBalance, Money serviceCharge)
  {
  super(initialBalance);
  this.serviceCharge = serviceCharge;
  }

boolean cashCheck(Money amount)
  {
  return withdraw(amount.add(serviceCharge));
  }

(continued next page)
ÒsuperÓ means Òthe constructor of the base classÓ.
Additional variable for the derived class.
Added service charge