is the practice of declaring the same function with different signatures. The same function name will be used with different number of parameters and parameters of different type. But overloading of functions with different return types are not allowed.
http://www.codersource.net/cpp_tutorial_function_overloading.html# with the integer data, other can deal float for precision etc.,
Overriding :Directs PB to deviate from its normal execution sequence. Both functions and events can be overridden.
Function Overriding : A descendant function has the same function signature as an ancestor function. The descendant function is executed instead of the ancestor function.
Event overriding : A descendant has the Override Ancestor Script option checked.
Go thr this links to know more abt Overriding;
Diff bet Both;
Method overriding is when a child class redefines the same method as a parent class, with the same parameters.
For example, the standard Java class java.util.LinkedHashSet extends java.util.HashSet. The method add() is overridden in LinkedHashSet. If you have a variable that is of type HashSet, and you call its add() method, it will call the appropriate implementation of add(), based on whether it is a HashSet or a LinkedHashSet. This is called polymorphism.
Method overloading is defining several methods in the same class, that accept different numbers and types of parameters. In this case, the actual method called is decided at compile-time, based on the number and types of arguments. For instance, the method System.out.println() is overloaded, so that you can pass ints as well as Strings, and it will call a different version of the method.
OUTPUT : derived class
as the object is of derived class it will call the function of derived.
As a developer this means that the information in your web site should go into your HTML files, but HTML files should not contain information about how that information is displayed. And you've probably guessed by now that information about how the pages should appear goes into CSS files.
You might wonder what advantages this conveys. Why go to all of this trouble? Just a couple of advantages might give you an idea about why this approach has long been considered beneficial in areas of document management that have been around a lot longer than the world wide web.
The traditional HTML approach was to "hardcode" all of the appearance information about a page. So you want all your headings in courier, and at different point sizes to the sizes built into browsers? Then, for every heading, in every page, set the font size and face properties. You've got more than 100 pages? That is a lot of editing, and a lot of re-editing if you decide to modify the appearance of your pages later. And with all of that editing there is plenty of possibility for introducing errors.
With CSS, you can decide how headings should appear, and enter that information once. Every heading in every page that is linked to this style sheet now has that appearance. Want to make every heading of level 3 more obviously different from those of level 2? Edit the style sheet, and every such heading now has the altered appearance. How many hours' work (and potential errors) have you just saved?
Another major advantage involves the management of large, sophisticated sites. With cascading style sheets, whole organizations can share a small number of style sheets, ensuring consistency across the site with no need for constant updating and editing to accommodate changes. For a discussion of this advantage in detail, see http://www.westciv.com/style_master/academy/css_tutorial/advanced/cascade_inheritance.html#large sites, in the section on cascade and inheritance.
There are plenty of other advantages, too. We return to this issue in more detail in the http://www.westciv.com/style_master/academy/css_tutorial/real_world/index.html section of the guide. For now though, let's find out what a style sheet actually is and how it performs all these miracles.
In the real world, you'll often find many individual objects all of the same kind. There may be thousands of other bicycles in existence, all of the same make and model. Each bicycle was built from the same set of blueprints and therefore contains the same components. In object-oriented terms, we say that your bicycle is an instance of the class of objects known as bicycles. A class is the blueprint from which individual objects are created.
There are many Adavantages of Class;
You can have resuability of all the methods n properties.
You can acheive Polymorohism, Inheritance, Encapsulation with class.
You can speed u application usig class.
You can save memory.