20 Design pattern and Software design interview questions for Programmers

Design patterns and software design questions are essential part of any programming interview, no matter whether you are going for Java interview or C#  interview. In face programming and design skill complement each other quite well, people who are good programmer are often a good designer as well as they know how to break a problem in to piece of code or software design but these skill just doesn’t come. You need to keep designing, programming both small scale and large scale systems and keep learning from mistakes.Learning about Object oriented design principles is a good starting point. Anyway this article is about some design questions which has been repeatedly asked in various interviews. I have divided them on two category for beginners and intermediate for the sake of clarity and difficulty level. It contains questions based upon object oriented design patterns as well as on software design e.g. how to code a vending machine in Java. In order to do well, you need to have good knowledge of object oriented analysis and design.

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