create food web

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create food web

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create food web create food web url. name and url are sufficient. That's because the print method must be called by a specific instance of the website class, and this instance knows what its data is. Or, another way of looking at it, the every object has its own print method. The print() method is completely enclosed within the website class.

create food web All methods in Java must belong to a class. Unlike C++ programs, Java programs cannot have a method hanging around in global space that does everything you forgot to do in your classes. ConstructorsThe first method most classes need is a constructor. A constructor creates a new instance of the class. It initializes all the variables and does any work necessary to prepare the class to be used.

create food web In the line website x = new website(); website() is a constructor. If no constructor exists Java provides a default one, but it's better to make sure you have your own. You make a constructor by writing a public method that has the same name as the class. Thus our website constructor is called website(). Here's a revised website class with a constructor that initializes all the members to null Strings.

create food web 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.

create food web

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create food web