Wrapper Classes | Autoboxing | Unboxing | Java

🔁 What is Autoboxing?

Autoboxing is the automatic conversion of a primitive type into its corresponding wrapper class.

✅ Example:

Java automatically converts int → Integer.

---

🔁 What is Unboxing?

Unboxing is the reverse process – converting a wrapper class object back to a primitive type.

✅ Example:

Java converts Integer → int.

---

📦 Wrapper Classes in Java

Primitive Type	Wrapper Class
byte	Byte
short	Short
int	Integer
long	Long
float	Float
double	Double
char	Character
boolean	Boolean

---

🧠 Why Use Wrapper Classes?

• Used in Collections (like ArrayList, HashMap)
• Provide utility methods (e.g., Integer.parseInt())
• Allow null values
• Enable autoboxing/unboxing

---

🔍 Real Example:

---

✅ Summary:

Concept	Description	Example
Autoboxing	int → Integer	Integer a = 10;
Unboxing	Integer → int	int b = a;
Wrapper	Object version of primitive	Integer, Double, Boolean