What are wrapper classes?

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🧱 What Are Wrapper Classes in Java?

In Java, wrapper classes are object representations of primitive data types. Java is an object-oriented language, and sometimes objects are required instead of primitive types — especially when working with collections like ArrayList, which can’t store primitive types directly.

🔹 Why Wrapper Classes?

Java has 8 primitive data types:

int, byte, short, long, float, double, char, boolean

For each of these, Java provides a corresponding wrapper class:

int → Integer

byte → Byte

short → Short

long → Long

float → Float

double → Double

char → Character

boolean → Boolean

🧠 Example:

java

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int num = 10;

Integer obj = Integer.valueOf(num); // Boxing

int newNum = obj.intValue();        // Unboxing

Since Java 5, autoboxing and auto-unboxing allow this conversion automatically:

java

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Integer x = 10;  // autoboxing

int y = x;       // auto-unboxing

📦 Use Cases:

Storing primitives in collections (e.g., List<Integer>)

Using utility methods like Integer.parseInt()

Working with generics, which only support objects

✅ Key Benefits:

Adds OOP capabilities to primitive types

Enables null assignment (e.g., Integer x = null)

Supports helper methods for conversion, comparison, etc.

In summary, wrapper classes bridge the gap between primitive data types and Java's object-oriented structure, making Java more flexible and consistent.

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Read more: 

What is method overloading vs overriding?

Explain polymorphism with examples.

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