The wrapper class in Java provides the mechanism to convert primitive into object and object into primitive.
---Use of Wrapper classes in Java---
Java is an object-oriented programming language, so we need to deal with objects many times like in Collections, Serialization, Synchronization, etc.
•Change the value in Method: Java supports only call by value. So, if we pass a primitive value, it will not change the original value. But, if we convert the primitive value in an object, it will change the original value.
•Serialization: We need to convert the objects into streams to perform the serialization. If we have a primitive value, we can convert it in objects through the wrapper classes.
•Synchronization: Java synchronization works with objects in Multithreading.
•java.util package: The java.util package provides the utility classes to deal with objects.
•Collection Framework: Java collection framework works with objects only. All classes of the collection framework (ArrayList, LinkedList, Vector, HashSet, LinkedHashSet, TreeSet, PriorityQueue, ArrayDeque, etc.) deal with objects only.
The eight wrapper class in java are:
