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What is a platform type in Kotlin when interoperating with Java code?

easy📝 Conceptual Q11 of 15
Kotlin - Null Safety
What is a platform type in Kotlin when interoperating with Java code?
AA type whose nullability is unknown and can be treated as nullable or non-nullable
BA Kotlin type that is always non-nullable
CA Java type that is always nullable
DA Kotlin type that enforces strict null checks at compile time
Step-by-Step Solution
Solution:

  1. Step 1: Understand Kotlin-Java interoperability

    Kotlin calls Java code but Java does not specify nullability explicitly.

  2. Step 2: Define platform types

    Platform types are types from Java whose nullability Kotlin cannot be sure about, so Kotlin treats them flexibly as nullable or non-nullable.

  3. Final Answer:

    A type whose nullability is unknown and can be treated as nullable or non-nullable -> Option A

  4. Quick Check:

    Platform type = unknown nullability [OK]
Quick Trick: Platform types have unknown nullability from Java [OK]
Common Mistakes:
MISTAKES
  • Thinking platform types are always non-nullable
  • Assuming platform types enforce null checks
  • Confusing platform types with Kotlin nullable types

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