[Solved] Identify the error in this code snippet:Integer num = null; int val = num; System.out.println(val); — Ans: Runtime NullPointerException during unboxing | Java

Java - Wrapper Classes

Identify the error in this code snippet:

Integer num = null;
int val = num;
System.out.println(val);

APrints 0 without error

BCompilation error due to null assignment

CRuntime NullPointerException during unboxing

DPrints 'null' as output

Step-by-Step Solution

Solution:

Step 1: Analyze unboxing of null Integer
Variable 'num' is null; unboxing null to int causes runtime error.
Step 2: Identify exception thrown
Unboxing null throws NullPointerException at runtime.
Final Answer:
Runtime NullPointerException during unboxing -> Option C
Quick Check:
Unboxing null causes NullPointerException [OK]

Quick Trick: Unboxing null causes runtime NullPointerException [OK]

Common Mistakes:

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