What are Wrapper classes in Java | Java Interview Questions #shorts #javaprogramming

What is a Wrapper class?

A Wrapper class converts primitive data types into objects. When we create an object to a wrapper class, it contains a field and in this field, we can store primitive data types.
In other words, we can wrap a primitive value into a wrapper class object.

Why do we Need Wrapper Classes?

Wrapper classes convert primitive data types into objects. Objects are needed if we wish to modify the arguments passed into a method (because primitive types are passed by value).

Autoboxing: Automatic conversion of primitive types to the object of their corresponding wrapper classes is known as autoboxing. For example – conversion of int to Integer

Unboxing: It is just the reverse process of autoboxing. Automatically converting an object of a wrapper class to its corresponding primitive type is known as unboxing. For example – conversion of Integer to int

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