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web site hosting services web site hosting services class website { String name; String url; String description; public website() { name = ""; url = ""; description = ""; }} Better yet, we should create a constructor that accepts three Strings as arguments and uses those to initialize the member variables like so:class website { String name; String url; String description; public website(String n, String u, String d) { name = n; url = u; description = d; }} We'd use this like so: website x = new website("Cafe Au Lait", "http://metalab.unc.edu/javafaq/", "Really cool!"); x.print(); This fits in well with the goal of keeping code relevant to the proper functioning of a class within the class.However what if sometimes when we want to create a web site we know the URL, name, and description, and sometimes we don't? Best of all, let's use both!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 = ""; }} This is called method overloading or polymorphism.

web site hosting services Polymorphism is a feature of object oriented languages that lets one name refer to different methods depending on context. The important context is typically the number and type of arguments to the method. In this case we use the first version of the method if we have three String arguments and the second version if we don't have any arguments.If you have one or two or four String arguments to the constructor, or arguments that aren't Strings, then the compiler generates an error because it doesn't have a method whose signature matches the requested method call. toString MethodsPrint methods are common in some languages but most Java programs operate differently.

web site hosting services You can use System.out.println() to print any object. However for good results your class should have a toString() method that formats the objects data in a sensible way and returns a String. Here's how we'd implement it in the websiteexample: public class ClassTest { public static void main(String args[]) { website x = new website("Cafe Au Lait", "http://metalab.

web site hosting services unc.edu/javafaq/", "Really cool!"); System.out.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.

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