Uncle Bob's Agile Development Corner
OBSERVER—Evolving into a pattern, Part 2
by Robert C. Martin
Listing 10. TimeSource.java.

public interface TimeSource
    public int getHours();
    public int getMinutes();
    public int getSeconds();

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 [email protected].