juniorKotlin

What is null safety in Kotlin?

Updated May 16, 2026

Short answer

Kotlin prevents null pointer exceptions using nullable types.

Deep explanation

Types must explicitly allow null using ?. Safe calls and Elvis operator handle nulls safely.

Real-world example

Preventing app crashes due to missing API data.

Common mistakes

  • Using !! operator unnecessarily.

Follow-up questions

  • What is Elvis operator?
  • What is safe call operator?

More Kotlin interview questions

View all →