Uncle Bob's Agile Development Corner
OBSERVER—Evolving into a pattern, Part 2
by Robert C. Martin
Listing 11.

public class MockTimeSource extends Subject
                            implements TimeSource
    private int itsHours;
    private int itsMinutes;
    private int itsSeconds;

    public void setTime(int hours, int minutes, int seconds)
        itsHours = hours;
        itsMinutes = minutes;
        itsSeconds = seconds;

    public int getHours()
        return itsHours;

    public int getMinutes()
        return itsMinutes;

    public int getSeconds()
        return itsSeconds;

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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