in java

Write an interface iMath which has 2 method add() and subtract(). Each takes in 2 integers and returns an integer. Next write an abstract class calculator which implements the interface imath. it should implement the method of the interface, and have 2 additional abstract methods multiply() and divide(). multiply() and divide() should take in 2 doubles each, and should both return a double.

Finally, implement a concrete class TexasInstrument which inherits from calculator, and implements the two abstract classes it inherited