Introduction - If you have any usage issues, please Google them yourself
Create a complex (Complex), two the class variable realPart and imaginaryPart
At least write two constructors writing three methods complex addition and subtraction, multiplication
(A, b)+ (c, d) (a+ c, b+ d)
(A, b)- (c, d) (a-c, b-d)
(A, b)* (c, d) = (ac-bd, ad+ bc)
Write a method that the complex (a, b) is displayed
Write a test class TestComplex, defined two complex numbers x, y achieve add, subtract, multiply and displays the results