Read e-book online Object-Oriented Programming with Visual Basic .Net PDF

By J.P. Hamilton

ISBN-10: 0596001460

ISBN-13: 9780596001469

Written for programmers acquainted with visible simple 6, this advisor explains the thoughts 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 how one can layout periods, take care of exceptions, construct customized attributes, and movement items right into a dispensed setting.

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3 Close and Dispose You should avoid using a Finalize method for several reasons. One reason is that objects with Finalize methods take longer to allocate. This book has shown how a pointer to the object must be stored in the finalization queue and later added to the freachable queue. This is no big deal in a simple program, but what about the example that allocates 10,000 objects? This scenario could add significant overhead, not to mention the overhead involving the garbage collector calling Finalize 10,000 times.

Also, assigning a value type to another instance of that type causes the value to be copied. The exception occurs when a value type is a reference type's data member; then it is heap allocated right along with the rest of the class. In the following code fragment, number1 and number2 are two distinct locations in memory that each contain the value 5: Dim number1 As Integer = 5 Dim number2 As Integer = number1 This contrasts with reference types (classes). Consider the following fragment, in which two objects are instantiated and then one is assigned to the other: Dim object1 As New Object( ) Dim object2 As New Object( ) object2 = object1 After the assignment, there are no longer two objects; object2 is now a reference to object1.

They usually handle details that clients should not have to worry about. They simplify an abstraction, which is the primary goal of any class design. Take a hypothetical CreditCard object. This object contains data that not everyone in the company should see, so before the object persists itself to the database, it must encrypt all of its member data. However, a developer should not have to know this detail. What if the Encrypt method is not called before the call Save? The data would be unencrypted when it was written to the database, available to all prying eyes.

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