Abstract class and interface is very popular in any object oriented programming language or Java interview, and there are always one or more questions from this. Interface is more common, because of its popularity among designers but questions from abstract class also pops up now and than. Interview questions from abstract class is more common on junior level or you say under 2 years experience of Java programmers, while interface related questions are mostly asked on senior level Java interview e.g. 4 or 6 years of experience. They are mostly asked along with other Java design pattern questions, e.g. Decorator pattern or Factory pattern . Any way, in this article we will see mix of these interview questions from abstract class and interface. All questions has been asked in various Java interviews and difficulty level for these question is easy for most of Java developer. It’s mostly fact based questions, but some questions like difference between abstract class and interface in Java, and when to prefer abstract class over interfacecan be really tricky.
10 Abstract Class and Interface Interview Questions Answers in Java
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