[Solved] Examine this Kotlin code snippet calling a Java method that returns a platform type:val textLength = javaApi.getDescription().lengthWhat issue might occur if getDescription() returns null at runtime? | Kotlin

Kotlin - Null Safety

Examine this Kotlin code snippet calling a Java method that returns a platform type:

val textLength = javaApi.getDescription().length

What issue might occur if getDescription() returns null at runtime?

AThe length will be inferred as -1 indicating a null value.

BThe code will safely return 0 as the length without any exception.

CThe Kotlin compiler will prevent compilation due to unsafe call on a platform type.

DA NullPointerException will be thrown because Kotlin assumes the platform type is non-null.

Step-by-Step Solution

Solution:

Step 1: Understand platform types
Platform types come from Java and have unknown nullability, so Kotlin treats them as if they could be nullable or non-nullable.
Step 2: Analyze the code
The code calls getDescription() and immediately accesses length without null checks.
Step 3: Runtime behavior
If getDescription() returns null, accessing length on null causes a NullPointerException at runtime.
Final Answer:
A NullPointerException will be thrown because Kotlin assumes the platform type is non-null. -> Option D
Quick Check:
Calling methods on platform types without null checks risks NullPointerException [OK]

Quick Trick: Platform types can be null; always check before accessing members [OK]

Common Mistakes:

MISTAKES

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