What is the output of the following code?

medium📝 Predict Output Q13 of 15

Java - Wrapper Classes

Integer a = 5;
int b = a + 10;
System.out.println(b);

ANullPointerException

BCompilation error

C15

Step-by-Step Solution

Solution:

Step 1: Understand autounboxing in expression
The Integer a is autounboxed to int to add 10.
Step 2: Calculate the sum
5 + 10 = 15, so b is 15 and printed.
Final Answer:
15 -> Option C
Quick Check:
Autounboxing + addition = 15 [OK]

Quick Trick: Wrapper auto-unboxes in arithmetic expressions [OK]

Common Mistakes:

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