Testing the design skill of a candidate is quite common on programming job interviews. Questions like, how do you design a vending machine or a traffic controller system is very popular on object oriented programming language interviews e.g. Java and C++. Designing a software of System requires good experience and knowledge about tools of object-oriented design and analysis. You should not only be good at OOP fundamentals like Abstraction, Inheritance, Polymorphism, Encapsulation, Coupling, Cohesion, Association, Aggregation, or Composition but also on several important object-oriented design principles like SOLID principles. A good knowledge of when to use a class over an interface is also important for designing a maintainable software or Java application. Now, questions are how do you develop such skills? You need to practice and practice hard. This is why I am sharing some frequently asked object oriented design questions from Java programming interviews here.
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