Question

Write a difference between Autoboxing and Unboxing.

Answer 1

Feature	Autoboxing	Unboxing
Definition	Converts a primitive type into its corresponding wrapper class object.	Converts a wrapper class object back into its primitive type.
Direction	Primitive → Object (e.g., int to Integer).	Object → Primitive (e.g., Integer to int).
Java Example	Integer obj = 25;	int num = obj;
Behind the Scenes	Java uses Integer.valueOf(25) under the hood.	Java uses obj.intValue() under the hood.
Common Use Case	When adding primitive numbers into collections like an ArrayList	When performing mathematical operations on values stored inside objects.