It’s never a good idea to go into an interview unprepared. While you may have the best experience and a portfolio showing that you’re an expert, the more information you have on the questions you may be asked, the better. This is especially true when it comes to object-oriented programming (OOP) interview questions.
While some OOP interview questions may seem unnecessary, they actually tell the interviewer that:
• You came prepared
• You know how to relay your knowledge
• Your understanding is at a certain level (e.g. expert, intermediate)
Ultimately, the manner in which you answer these questions will determine whether you’ll get the job, and/or what kind of position you’ll get. To help you prepare as much as possible, we’ve compiled all the possible questions you may be asked in your next OOP interview. Let’s take a look!
Object-oriented programming is a programming language model that relies on objects (as opposed to actions), and data (as opposed to logic). These objects typically contain data and interact with one another, which is why they often have self-modifying features once the proper procedures have been put into place. Classes are representations of object types, and objects are instances of class with their own state, behavior and identity.
Java, C++, C#, Python, PHP, Ruby.
Typically, it’s based on classes, which are representations of object types. However, OOP can also be prototype-based.
4. WHAT’S THE DIFFERENCE BETWEEN CLASS-BASED AND PROTOTYPE-BASED OBJECTS IN OOP, AND WHAT’S AN ABSTRACT CLASS?
When OOP is class-based, we create objects and then sort them into appropriate classes with shared attributes. For example, if we have apples and oranges, we can expect both to have the attributes of fruit (have a color, taste, etc.). However, when we use the prototype-based objects, the objects are our main point of focus. There are no classes, and we observe objects as standalone entities. Finally, an abstract class is a class that can’t be instantiated.