// A subclass of the Account class.
// This example illustrates adding instance variables and
// overriding a method in the parent class.
//       Nancy McCracken  3/14/97


public class AccountCmp extends Account
{ // instance variables
  static float minbalance = 6000.F;
  static float penalty = 20.F;

  // constructor method is same as parent
  public AccountCmp (String n, float b)
  { super (n, b);  }

  // override one method
  public void monthactivity()
  { if (balance < minbalance) balance -= penalty;
    balance = balance * (float)(Math.pow (1 + (interestrate/12)/30, 30));
  }
}