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OOPS concepts used in the below code is

Object:

objects are always called instances of a class which are created from a class in java .they have states and behavior.

objects are called in every class,methods created in the calculator code

Class:

classes are like object constructors for creating objects.A class has both static and instance initializers.to create the classes we use the keyword Class in the below program

Abstraction:

Abstraction is a process which displays only the necessary information.In the code we only shows the results instead of calculating part.

Inheritance:

Inheritance is a method of an object acquiring another object properties.In the below code inheritance was happened.