public class BonusSaverAccount extends SavingsAccount {
    private int penalty;
    private double bonus;
    // Konstruktor:
    public BonusSaverAccount(int id, double init, 
                                     double rate) {
        super(id, init, rate); 
        penalty = 25; 
        bonus = 0.03;
    }
    // Modifizierung der Objekt-Methoden:
    public boolean withdraw(double amount) {
        boolean res;
        if (res = super.withdraw(amount + penalty)) 
            System.out.println(
                "Penalty incurred:\t"+ penalty);
        return res;
    }
    public void addInterest() {
        balance = balance * (1 + interestRate + bonus);
        System.out.println(
              "Interest added to account: " + account
            + "\nNew balance:\t" + balance);
    }
} // end of class BonusSaverAccount