To provide students with a more effective treatment of this difficult topic, John Wiley and Sons, Inc. published Thinking Recursively by Eric Roberts. Since its publication in 1986, Thinking Recursively has become a classic in a field in which books quickly become obsolete. By focusing on effective problem-solving strategies that enable students to "think recursively," this text has helped many students over the conceptual hurdle that recursion so often represents. Moreover, by including many more examples and exercises than typical, Thinking Recursively makes it possible for students to master recursive techniques. To celebrate the 20th anniversary of its initial publication, John Wiley and Sons is publishing Thinking Recursively with Java , making the book even more relevant to today's students. Course Hierarchy: May fit a variety of Java programming courses as a supplement at the introductory or intermediate levels or serve as a core text in intermediate or advanced level programming courses.