By J.P. Hamilton
Written for programmers conversant in visible uncomplicated 6, this consultant explains the techniques of object-oriented programming and the way they're utilized within the .NET framework. the writer simplifies the aim of abstraction, encapsulation, inheritance, and polymorphism, outlines the typical language runtime and .NET category library, and indicates find out how to layout sessions, take care of exceptions, construct customized attributes, and movement items right into a dispensed atmosphere.
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Objects that do not have Finalize methods are freed at this point. Objects with a Finalize method are not (objects implementing Finalize are freed last). 48 49 A special runtime thread is dedicated to calling Finalize methods. When objects appear in the freachable queue, the thread is awakened, and Finalize is called for every object in the queue. Collect doesn't mean that the object will be freed immediately. After all, the call occurs on a different thread. Collect because of the overhead associated with the call; it's an application-wide call.
Try that in C++! Example 3-8. IO 51 52 Public Class Log Public Delegate Sub Writer(ByVal msg As String) Private myWriter As Writer Public Sub New(ByVal writeMethod As Writer) myWriter = writeMethod End Sub Public Sub Write(ByVal msg As String) myWriter(msg) End Sub End Class Notice that once you define a delegate, you can declare a variable that holds that type. This is the case with myWriter, which is declared immediately after the delegate declaration. The constructor for the class is then used to specify which method Log should use to perform its duties.
Protected Friend This modifier has the attributes of both Protected and Friend. Shared Shared is an access modifier specific to member data and methods; classes cannot be shared. Shared member function methods and member data are not associated with a particular class instance (although they can be called through a class instance). ToString( )) Shared has the same meaning as static in C#, C++, and Java. When using access modifiers, you should treat member data differently than member functions.
Object-Oriented Programming with Visual Basic .Net by J.P. Hamilton