Uncle Bob's Agile Development Corner
ObserverEvolving into a pattern, Part 1
by Robert C. Martin
Listing 4. ClockDriver.java.
public class ClockDriver
private TimeSink itsSink;
public ClockDriver(TimeSource source, TimeSink sink)
itsSink = sink;
public void update(int hours, int minutes, int seconds)
itsSink.setTime(hours, minutes, seconds);
Robert C. Martin is president of Object Mentor Inc., a firm that offers high-level, OO software design consulting, training, and development services. He is the author of Designing Object Oriented C++ Applications Using the Booch Method. He can be contacted at firstname.lastname@example.org.