April 2002
Intermediate to advanced
688 pages
19h 51m
English
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Changes in Object-Orientation
As you may know, Visual Basic has implemented some features of object-oriented programming since Version 4. However, in terms of object-orientation, the step from Version 6 to VB.NET is very significant. Indeed, some people did not consider VB 6 (or earlier versions) to be a truly object-oriented programming language. Whatever your thoughts may have been on this matter, it seems clear that VB.NET is an object-oriented programming language by any reasonable definition of that term.
Here are the main changes in the direction of object-orientation. We discuss these issues in detail in Chapter 4.
Inheritance
VB.NET supports object-oriented inheritance (but not multiple inheritance). This means that a class can derive from another (base) class, thereby inheriting all of the properties, methods, and events of the base class. Since forms are also classes, inheritance applies to forms as well. This allows new forms to be created based on existing forms. We discuss inheritance in detail in Chapter 4.
Overloading
VB.NET supports a language feature known as
function
overloading. The idea is simple and yet quite useful. We
can use the same name for different functions (or subroutines), as
long as the functions can be distinguished by their
argument signature. The argument signature of a function (or subroutine) is the sequence of data types of the arguments of the function. Thus, in order for two functions to have the same argument signature, they must have the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.