The Java language introduced the concept of byte code. The evolution of programming languages dictates that some things survive and some don't. Hopefully, the good ideas are propagated and the bad ones are not.
Intermediate Language , or IL, is similar to the idea of Java byte code. If the compiled form of a programming language is general enough, the compiled code can be separated from the platform on which it runs. The idea behind Java is that the compiler creates byte code, and some other tool converts the byte code to a platform-specific version of the code that runs on that specific platform. These other tools are often referred to as JITters , from the abbreviation for JIT compilers. (JIT is an acronym for just-in-time, as in just-in-time compilation.)
There is a good chance that someone, right now, is creating a JITter to convert VB .NET IL code to run on a Linux or UNIX platform.
One of the things we can do with IL is snoop around and look at what the VB compiler does with our source code. More than just being
A program that ships with .NET is the
A good learning aid is to discover or explore what our precursors have done or are doing. You can find the ildasm utility in the C:\Program Files\Microsoft Visual Studio .NET\FrameworkSDK\Bin\ folder of the Visual Studio .NET application.
Chapter 1 provided you with an object-oriented overview. By now
you know that many things are familiar in .NET because they are
similar to VB6, and you likely have
The purpose of this book is to go beyond teaching you basic syntax, to demonstrating the most advanced features of the VB .NET. In that regard it is important to realize that everything about .NET is a class. When you have mastered object-oriented concepts, what is left is to discover the available classes and what problems they solve.
Because VB .NET diverges from VB6 regarding classes and
interfaces, Chapter 2 explores this
Chapter 2. Inheritance and Interfaces
Inheritance, aggregation, and interfaces are three of your
With the incorporation of inheritance into VB .NET some new
capabilities are now available. Also, the way interfaces are used
has changed. Chapter 2