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private java servlet private jsp private java servlet private jsp println(x); }} class website { String name; String url; String description; public website(String n, String u, String d) { name = n; url = u; description = d; } public website() { name = ""; url = ""; description = ""; } public String toString() { return (name + " at " + url + " is " + description); }}Some AdvocacyUnfortunately the object oriented language that took hold was C++. Among much fitter contenders for object languages, notably Smalltalk, C++ had the unique advantage of being downward compatible with the C programmers were already familiar with. Unfortunately this advantage had the huge side effect of forcing C++ to accept all of C's obfuscated macros, pointer arithmetic, and now redundant structs. The baggage imposed on C++ by the need to be compatible with C went a long way toward wiping out the advantage of object oriented programming.Java is the latest and possibly the greatest third generation programming language.

private java servlet private jsp Here I need to explain why Java is a better OOP language than C++.A Non-Trivial Examples: Complex NumbersAs mentioned in Chapter 2 one of the features needed for serious scientific computation is complex numbers. 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.

private java servlet private jsp ) Let's see how we might implement them in Java. From the standpoint of a data type you really don't need much. 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.

private java servlet private jsp 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. 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.

private java servlet private jsp

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private java servlet private jsp