public static void main(String[] args) {
Cleanser x = new Cleanser();
x.dilute();
x.apply();
x.scrub();
System.out.println(x);
monitor.expect(new String[] {"Cleanser dilute() apply() scrub()"});
}
// Change a method:
public void scrub() {
append(" Detergent.scrub()");
super.scrub(); // Call base-class version
}