Java - Wrapper Classes
What will be the output of the following Java code?
int x = 10; Integer y = x; System.out.println(y + 5);
What will be the output of the following Java code?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Understand autoboxing and unboxing in the code
Variable x is primitive int 10. Assigning to Integer y autoboxes int to Integer object. In print, y is unboxed to int for addition.Step 2: Calculate the expression
y + 5 becomes 10 + 5 = 15, so output is 15.Final Answer:
15 -> Option AQuick Check:
Autoboxing and unboxing allow arithmetic: 10 + 5 = 15 [OK]
Quick Trick: Autoboxing/unboxing lets Integer behave like int in math [OK]
Common Mistakes:
- Thinking y + 5 concatenates as string
- Expecting compilation error due to object usage
- Confusing autoboxing with no conversion
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