make barcode with vb.net Class Relationships in C#.NET

Generation Code 128C in C#.NET Class Relationships

Class Relationships
Generating Code 128B In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create Code128 image in VS .NET applications.
www.OnBarcode.com
Recognize Code 128 Code Set C In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
The heart of object-oriented design is establishing relationships among the classes. Classes interact and relate to one another in various ways. The simplest interaction is when a method in one class is used to call a method in a second class. For example, the Manager class might have a method that calls the UpdateSalary method on an object of type Employee. We then say that the Manager class and the Employee class are associated. Association among classes simply means they interact.
USS Code 128 Creation In C#
Using Barcode encoder for .NET Control to generate, create Code 128 Code Set A image in .NET framework applications.
www.OnBarcode.com
Printing QR Code 2d Barcode In C#
Using Barcode generation for Visual Studio .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
www.OnBarcode.com
Class Relationships |
PDF-417 2d Barcode Encoder In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
www.OnBarcode.com
Encode GTIN - 128 In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create UCC-128 image in .NET applications.
www.OnBarcode.com
Some complicated types are composed of other types. For example, an automobile might be composed of wheels, engine, transmission, and so forth. You might model this by creating a Wheel class, an Engine class, and a Transmission class. You could then create an Automobile class, and each automobile object would have four instances of the Wheel class and one instance each of the Engine and Transmission classes. This is commonly called the has-a relationship. Another way to view this relationship is to say that the Automobile class aggregates the Wheel, Engine, and Transmission classes, or that the Automobile class is composed of Wheel, Engine, and Transmission objects.
Creating Matrix 2D Barcode In C#
Using Barcode creator for .NET Control to generate, create Matrix image in Visual Studio .NET applications.
www.OnBarcode.com
Make ABC Codabar In C#
Using Barcode generation for .NET Control to generate, create Code 2 of 7 image in .NET framework applications.
www.OnBarcode.com
Some programming languages (such as C++) distinguish between the is-composed-of (composition) and the has-a (aggregation) relationships, but this distinction does not apply in C#, and they are treated as equivalent.
Code 128 Code Set A Maker In .NET Framework
Using Barcode creation for Reporting Service Control to generate, create Code 128 Code Set B image in Reporting Service applications.
www.OnBarcode.com
Make Code128 In C#.NET
Using Barcode generation for .NET Control to generate, create Code 128A image in VS .NET applications.
www.OnBarcode.com
This process of aggregation (or composition) allows you to build very complex classes by assembling and combining relatively simple classes. The .NET Framework provides a String class to handle text strings. You might create your own Address class out of five text strings (address line 1, address line 2, city, state, and zip code). You might then create a second class, Employee, which has as one of its members an instance of Address.
Linear Barcode Printer In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Linear image in ASP.NET applications.
www.OnBarcode.com
Generate PDF 417 In None
Using Barcode generator for Microsoft Word Control to generate, create PDF-417 2d barcode image in Office Word applications.
www.OnBarcode.com
The Three Pillars of Object-Oriented Programming
Barcode Decoder In Java
Using Barcode Control SDK for BIRT reports Control to generate, create, read, scan barcode image in BIRT applications.
www.OnBarcode.com
Make PDF-417 2d Barcode In None
Using Barcode encoder for Online Control to generate, create PDF417 image in Online applications.
www.OnBarcode.com
Object-oriented programming is built on three pillars: encapsulation, specialization, and polymorphism. Each class should be fully encapsulated; that is, it should fully define the state and responsibilities of that type. Specialization allows you to establish hierarchical relationships among your classes. Polymorphism allows you to treat a group of hierarchically related objects in a similar way and have the objects sort out how to implement the programming instructions.
Code 128 Code Set B Maker In Java
Using Barcode maker for Java Control to generate, create ANSI/AIM Code 128 image in Java applications.
www.OnBarcode.com
PDF417 Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Encapsulation
Decoding Barcode In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
www.OnBarcode.com
Print GTIN - 128 In .NET
Using Barcode maker for Reporting Service Control to generate, create EAN 128 image in Reporting Service applications.
www.OnBarcode.com
The first pillar of object-oriented programming is encapsulation. The idea behind encapsulation is that you want to keep each type or class discrete and self-contained so that you can change the implementation of one class without affecting any other class. A class that provides a method that other classes can use is called a server. A class that uses that method is called a client. Encapsulation allows you to change the details of how a server does its work without breaking anything in the implementation of the client.
Code 3 Of 9 Decoder In VS .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Encode USS-128 In Objective-C
Using Barcode encoder for iPad Control to generate, create UCC.EAN - 128 image in iPad applications.
www.OnBarcode.com
|
6: Object-Oriented Programming
This is accomplished by drawing a bright and shining line between the public interface of a class and its private implementation. The public interface is a contract issued by your class that consists of two parts. The first part says, I promise to be able to do this work. Specifically, you ll see that a public interface says, Call this method, with these parameters, and I ll do this work, and return this value. The second part says, You are allowed to access these values (and no others). C# implements this second part of the interface through properties (discussed in 8). A client can rely on a public interface not to change. If the public interface does change, the client must be recompiled and perhaps redesigned. On the other hand, the private implementation is, as its name implies, private to the server. The designer of the server class is free to change how it does the work promised in the public interface, as long as it continues to fulfill the terms of its implicit contract: it must take the given parameters, do the promised work, and return the promised value and allow access to the public properties. For example, you might have a public method NetPresentValue( ) that promises as follows: Give me a dollar amount and a number of years, and I ll return the net present value. How you compute that amount is your business; as long as you return the net present value given a dollar amount and number of years, the client doesn t care whether you look it up in a table, compute the value, or ask your friend who is really good at math. You might implement your Net Present Value interface initially by keeping a table of values. Sometime later, you might change your program to compute the net present value using the appropriate algebra. That is encapsulated within your class, and it does not affect the client. As long as you don t change the public interface (that is, as long as you don t change the number or type of parameters expected, or change the type of the return value), your clients will not break when you change the implementation.
Copyright © OnBarcode.com . All rights reserved.