Abstract Class

Lesson in the Kotlin Roadmap · Stage 30: Coroutines Builders

Last updated 14 September 2026

What is Abstract Class?

An abstract class in Kotlin is a class that cannot be instantiated directly. It's designed to be a blueprint for other classes. Abstract classes can contain both abstract members (methods and properties without implementation) and concrete members (with implementation). Subclasses (derived classes) must implement the abstract members, providing their specific behavior, unless the subclass itself is also declared abstract. This enforces a certain structure and behavior across a family of related classes.

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Free resources to learn Abstract Class

Official docsAbstract classes
ArticleKotlin Abstract Class
VideoKotlin Newbie to Pro - ABSTRACT CLASSES

Abstract Class: common questions

Can I learn Abstract Class in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Abstract Class in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Abstract Class tutorial for beginners?

It is lesson 86 of 153 in the free Kotlin roadmap, in stage 30, Coroutines Builders. If you are new to Kotlin, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.