Which of the following is the correct syntax to autobox an int value 5 into an Integer object?

easy📝 Syntax Q3 of 15

Java - Wrapper Classes

Which of the following is the correct syntax to autobox an int value 5 into an Integer object?

AInteger num = 5;

BAll of the above

CInteger num = Integer.valueOf(5);

DInteger num = new Integer(5);

Step-by-Step Solution

Solution:

Step 1: Review each syntax
Integer num = 5; uses autoboxing (compiler inserts valueOf). A uses explicit constructor (deprecated), C uses explicit factory method.
Step 2: Confirm correctness
Only D is the syntax for autoboxing, as it triggers automatic conversion.
Final Answer:
Integer num = 5; -> Option A
Quick Check:
Autoboxing syntax: direct primitive assignment to wrapper [OK]

Quick Trick: Autoboxing syntax is direct assignment: Integer num = 5; [OK]

Common Mistakes:

Master "Wrapper Classes" in Java

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Java Quizzes