Kotlin Interview Questions (Complete List for Android Devs)

Kotlin Interview Questions (Complete List for Android Devs)

If you're preparing for Android interviews, make sure you can confidently answer these:

Kotlin Fundamentals

1. Advantages of Kotlin over Java?

2. Difference between const val and val?

3. What is a data class?

4. Data class vs Regular class?

5. Common interview questions on Data Class

6. How to make a singleton class in Kotlin?

7. Can we make a singleton without object?

8. Different types of scope functions?

9. What is an init block?

10. How to choose between apply and with?

11. What is an inline function?

12. When to use sealed classes?

13. What is lateinit?

14. lateinit vs by lazy

15. == vs === in Kotlin

16. What are Lambdas?

17. What is a companion object?

18. What is a reified type?

19. Extension functions – why and when?

20. What is infix notation?

Coroutines & Concurrency

1. Thread vs Coroutines

2. Coroutine vs Java Thread

3. What are coroutines?

4. Why are coroutines lightweight?

5. Coroutine scopes – name and explain

6. launch vs async

7. Series vs parallel execution in coroutines

8. What are Dispatchers?

9. Dispatchers.Default vs Dispatchers.IO

10. withContext vs runBlocking

11. What happens when .cancel() is called?

12. Suspending vs Blocking

13. What happens if you run long task on main thread?

14. What is SupervisorScope?

15. Exception handling in coroutines

16. How coroutine switches context?

17. How coroutines work internally?

18. delay() vs Thread.sleep()

Flow & Reactive

1. What is Flow?

2. Flow vs SharedFlow vs StateFlow

3. Real-world use case of StateFlow and SharedFlow

Advanced Kotlin

1. Higher Order Functions

2. Builder Pattern in Kotlin

3. Variance & Covariance

4. map vs flatMap

5. Collections API in Kotlin

6. associateBy() function

7. Visibility modifiers in Kotlin

8. Role of internal modifier

9. JvmStatic annotation

10. JvmField annotation

11. JvmOverloads annotation

12. noinline vs crossinline

13. const advantage

14. List vs Array

15. Elvis operator ?:

16. StringBuffer vs StringBuilder

17. Labels in Kotlin

18. How to check if lateinit is initialized?

19. Open keyword in Kotlin

📌 If you can explain these with real examples, you’re ready for serious Android interviews.

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