Wrapper Classes-INTRODUCTION

 Wrapper Classes

A Wrapper class in Java is a class whose object wraps or contains primitive data types. 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. Let’s check on the wrapper classes in Java with examples:

Need of Wrapper Classes

There are certain needs for using the Wrapper class in Java as mentioned below:

They 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).

The classes in java.util package handles only objects and hence wrapper classes help in this case also.

Data structures in the Collection framework, such as ArrayList and Vector, store only objects (reference types) and not primitive types.

An object is needed to support synchronization in multithreading.

Advantages of Wrapper Classes

Collections allowed only object data.

On object data we can call multiple methods compareTo(), equals(), toString()

Cloning process only objects

Object data allowed null values.

Serialization can allow only object data.

REF:https://www.geeksforgeeks.org/wrapper-classes-java/