Which of the following Java statements correctly uses unboxing?

easy📝 Syntax Q12 of 15

Java - Wrapper Classes

AInteger num = 10; int val = num;

BInteger val = new Integer(10);

CInteger num = int 10;

DInteger val = Integer.valueOf(10);

Step-by-Step Solution

Solution:

Step 1: Check each option for correct syntax and unboxing
Integer num = 10; int val = num; assigns Integer object to int variable, triggering unboxing automatically.
Step 2: Identify errors in other options
Integer val = new Integer(10); assigns wrapper object to wrapper variable (no unboxing); Integer num = int 10; has invalid syntax; Integer val = Integer.valueOf(10); assigns wrapper object to wrapper variable (no unboxing).
Final Answer:
Integer num = 10; int val = num; -> Option A
Quick Check:
Wrapper to primitive assignment triggers unboxing [OK]

Quick Trick: Assign wrapper object to primitive variable to unbox [OK]

Common Mistakes:

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