A) What are wrapper Classes? What are the available wrapper classes? B) What is Autoboxing and...

A) What are wrapper Classes? What are the available wrapper classes?

B) What is Autoboxing and Unboxing?

Expert Solution

Wrap meaning enclose, it represents a data type and gives an object as appearance, wherever data type will be required as an object, this object can be used.
In other word you can say that : mechanism to convert primitive into object and object into primitive.
Major reason to use wrapper class :

So that a null value is possible
To include in a Collection
To treat generically / polymorphically as an Object along with other Objects

List of available Wrapper classes

Boolean
Character
Byte
Short
Integer
Long
Float
Double

In J2SE 5.0 autoboxing and unboxing has been introduced

The feature of converting primitive into object (into its equivalent Wrapper) and object into primitive automatically. The automatic conversion of primitive into object is known as autoboxing and vice-versa unboxing.

This is the new feature of Java help programmers a lot due to that java programmer doesn't need to write the conversion code.

venereology answered 2 years ago

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