Uncle Bob's Agile Development Corner
Observer—Evolving into a pattern, Part 1
by Robert C. Martin
Listing 5.

public class MockTimeSource implements TimeSource
    private ClockDriver itsDriver;

    public void setTime(int hours, int minutes, int seconds)
        itsDriver.update(hours, minutes, seconds);

    public void setDriver(ClockDriver driver)
        itsDriver = driver;

About the Author

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


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