This book is an update of the classic “Walls and Mirrors” approach to programming, which instills the use of both abstraction (the walls) and recursion (the mirrors) to design solutions to problems. Data Abstraction and Problem Solving with Java: Walls and Mirrors provides a focus on the important concepts of data abstraction and data structures in a manner accessible to students at the introductory level. The book carefully accounts for the strengths and weaknesses of the Java language and is committed to a pedagogical approach that makes the material student friendly. The focus of this book is data abstraction, as well as key object-oriented concepts, including encapsulation, inheritance, and polymorphism.