? Autoboxing & Unboxing in Java

? Quick Overview

Autoboxing and unboxing are features in Java that automatically convert primitive data types into their corresponding wrapper classes and vice versa. These features were introduced in Java 5 to simplify code and improve readability.

? Key Concepts

• Autoboxing Primitive → Wrapper Object
• Unboxing Wrapper Object → Primitive
• Wrapper classes are immutable
• Common wrapper classes: Integer, Double, Boolean, Character

? Syntax & Theory

Java automatically performs boxing when a primitive is assigned to a wrapper type, and unboxing when a wrapper object is assigned to a primitive variable.

// Autoboxing: int to Integer
int a = 10;
Integer obj = a;

// Unboxing: Integer to int
int b = obj;

? Code Example

// Demonstrating autoboxing and unboxing in Java
public class AutoboxDemo {
public static void main(String[] args) {

Integer x = 50;
int y = x;

System.out.println("Wrapper value: " + x);
System.out.println("Primitive value: " + y);
}
}

? Explanation

In this example, the primitive value 50 is automatically converted into an Integer object (autoboxing). Later, the same object is converted back into a primitive int (unboxing) without explicit method calls.