Object-Oriented Design Choices

By: Adair Dingle

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Paperback | 19 January 2021 | Edition Number 1

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350 Pages

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23.4 x 15.6 x 1.85

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Do modern programming languages, IDEs and libraries make coding easy? Maybe, but coding is not design. Large-scale or expensive apps clearly require evaluation of design choices. Still, software design directly impacts code reuse and longevity even for small-scale apps with limited overhead. This text evaluates and contrast common object-oriented designs.

A given problem may have many solutions. A developer may employ different design techniques - composition, inheritance, dependency injection, delegation, etc. - to solve a particular problem. A skilled developer can determine the costs and benefits of different design responses, even amid competing concerns. A responsible developer documents design choices as a contract with the client, delineating external and internal responsibilities. To promote effective software design, this book examines contractual, object-oriented designs for immediate and sustained use as well as code reuse. The intent of identifying design variants is to recognize and manage conflicting goals such as: short versus long-term utility, stability versus flexibility, storage versus computation. Many examples are given to evaluate and contrast different solutions, and to compare C# and C++ effects. No one has a crystal ball. However, deliberate design promotes software longevity. With the prominence of legacy OO code, a clear understanding of different object-oriented designs is essential.

Design questions abound. Is code reuse better with inheritance or composition? Should composition rely on complete encapsulation? Design choices impact flexibility, efficiency, stability, longevity and reuse. Yet, compilers do not enforce design and syntax does not necessarily illustrate design. Through deliberate design, or redesign when refactoring, developers construct sustainable, efficient code.

Industry Reviews

"The introduction of object-oriented programming was a pivotal moment in software engineering, leading to a new way of creating systems by modelling their constituents independently and linking them through shared interfaces. Object orientation allows for the creation of more complex systems, better focus on a small subset of components at any given time, and a greater level of component independence; it even facilitates the creation of software product lines. Designing a system using object orientation requires the mastery of several interdependent concepts, such as abstraction, inheritance, composition, and polymorphism. Dingle (Seattle Univ.) provides a cohesive framework for learning object-oriented design from a practical point of view. Concepts are introduced hierarchically, starting from the idea of encapsulation and design as a contract and drilling down to specifics such as virtual function tables and abstract classes. This approach results in an incremental experience of learning object-oriented design that is rarely found in computer science courses, but that is essential for software engineers who wish to harness the power of object-oriented programming languages in practice. Although no book can fully replace hands-on bench experience, this compact guide can ensure that one's practical efforts will be optimally targeted.

--L. Benedicenti, University of New Brunswick

Review in April 2022 Issue of CHOICE

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