Since Java 5, we do not need to use the valueOf() method of wrapper classes to convert the primitive into objects. The automatic conversion of primitive data type into its corresponding wrapper class is known as autoboxing, for example, byte to Byte, char to Character, int to Integer, long to Long, float to Float, boolean to Boolean, double to Double, and short to Short. The list of eight wrapper classes are given below: Primitive Type The eight classes of the java.lang package are known as wrapper classes in Java. All classes of the collection framework (ArrayList, LinkedList, Vector, HashSet, LinkedHashSet, TreeSet, PriorityQueue, ArrayDeque, etc.) deal with objects only. Collection Framework: Java collection framework works with objects only.java.util package: The java.util package provides the utility classes to deal with objects.Synchronization: Java synchronization works with objects in Multithreading.If we have a primitive value, we can convert it in objects through the wrapper classes. Serialization: We need to convert the objects into streams to perform the serialization.

But, if we convert the primitive value in an object, it will change the original value.

So, if we pass a primitive value, it will not change the original value.

Change the value in Method: Java supports only call by value.

Let us see the different scenarios, where we need to use the wrapper classes. Java is an object-oriented programming language, so we need to deal with objects many times like in Collections, Serialization, Synchronization, etc.

The automatic conversion of primitive into an object is known as autoboxing and vice-versa unboxing. Since J2SE 5.0, autoboxing and unboxing feature convert primitives into objects and objects into primitives automatically. The wrapper class in Java provides the mechanism to convert primitive into object and object into primitive.

Software wrapper programs