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web site hosting services Unfortunately no popular computer language other than Fortran provides them as a built-in data type. (Actually this is such a common and useful example and was used by so many textbooks that it was recently added to the C++ standard library which makes it far less useful as an example. Fortunately, however, Java has not yet been around long enough to have all its really useful examples coopted into the standard library.) Let's see how we might implement them in Java. From the standpoint of a data type you really don't need much.
web site hosting services Mathematically a complex number is composed of a real part u and an imaginary part v. We can create such a class in the following way:public class ComplexNumber extends Object { public double u; public double v;}While this is sufficient to encompass all the data that one needs in a complex number it's not a very good example of object-oriented programming. To actually do anything with this number we have to know exactly how the data structure is defined. If we change the data structure, for instance by defining a complex number in terms of it's magnitude r and its argument theta instead of by its real and imaginary components we have to change all the code that depends on it. We also have to write code to explicitly add the numbers, multiply them or do anything else we might need to do with complex numbers.
web site hosting services If we need to add complex numbers in more than one place, then we need to write the addition code again, or, at the very least, copy and paste it.A better implementation of a complex number class will shield us from the exact storage of the data, i.e. x and y vs. r and theta.
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