[Solved] What will be the output of the following Java code snippet?int num = 15; Integer boxedNum = num; System.out.println(boxedNum * 2); | Java

Java - Wrapper Classes

What will be the output of the following Java code snippet?

int num = 15;
Integer boxedNum = num;
System.out.println(boxedNum * 2);

ACompilation error

B30

C15

DNullPointerException

Step-by-Step Solution

Solution:

Step 1: Understand autoboxing and unboxing
The primitive int 'num' is autoboxed to Integer 'boxedNum'. When used in arithmetic, 'boxedNum' is unboxed back to int.
Step 2: Calculate the expression
boxedNum * 2 equals 15 * 2 = 30.
Final Answer:
30 -> Option B
Quick Check:
Autoboxing and unboxing allow arithmetic without errors [OK]

Quick Trick: Autoboxing and unboxing allow seamless arithmetic [OK]

Common Mistakes:

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