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Java · Junior · Theory

What's the difference between an abstract class and an interface, and when do you use each?

~4 min by voice

How to approach it

This checks whether you understand not only the syntactic differences (fields, constructors, multiple implementation, default methods) but also the meaning: an interface is a contract or capability, an abstract class is a common base with state. And whether you can choose between them deliberately.

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oopinterfaces
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Answer by voice

The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.

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Best with headphones · ~4 min