Wrapper class in Java
Wrapper class in java provides the mechanism to convert primitive into object and object into primitive.
Since J2SE 5.0, autoboxing and unboxing feature converts primitive into object and object into primitive automatically. The automatic conversion of primitive into object is known as autoboxing and vice-versa unboxing.
The eight classes of java.lang package are known as wrapper classes in java. The list of eight wrapper classes are given below:
Wrapper class Example: Primitive to Wrapper
20 20 20
Wrapper class Example: Wrapper to Primitive
3 3 3