What is the output of this Java code?

medium📝 Predict Output Q4 of 15

Java - Wrapper Classes

Integer a = 7;
int b = a + 3;
System.out.println(b);

A73

B10

DCompilation error

Step-by-Step Solution

Solution:

Step 1: Identify unboxing in expression
Variable 'a' is Integer, 'b' is int. 'a + 3' unboxes 'a' to int and adds 3.
Step 2: Calculate the result
7 + 3 = 10, so b = 10, printed output is 10.
Final Answer:
10 -> Option B
Quick Check:
Unboxing allows arithmetic with wrapper objects [OK]

Quick Trick: Unboxing allows Integer in arithmetic expressions [OK]

Common Mistakes:

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