make barcode with vb.net 6: Object-Oriented Programming in C#

Maker Code 128 Code Set C in C# 6: Object-Oriented Programming

6: Object-Oriented Programming
Code 128 Code Set C Encoder In Visual C#
Using Barcode creator for .NET framework Control to generate, create Code128 image in .NET applications.
www.OnBarcode.com
Scan Code 128 Code Set C In Visual C#.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
chapter purely to theory without letting you put your hands on the code. But now that we ve taken a timeout to teach you the theory, it s time to get back in the game. 7 shows you how to create and use classes and objects, and then 8 goes into more detail about methods.
Code-39 Generator In C#.NET
Using Barcode creator for VS .NET Control to generate, create Code 3/9 image in Visual Studio .NET applications.
www.OnBarcode.com
Encoding Data Matrix In Visual C#
Using Barcode creation for Visual Studio .NET Control to generate, create ECC200 image in .NET framework applications.
www.OnBarcode.com
Test Your Knowledge: Quiz
EAN13 Encoder In Visual C#
Using Barcode encoder for VS .NET Control to generate, create EAN13 image in Visual Studio .NET applications.
www.OnBarcode.com
Printing Barcode In Visual C#.NET
Using Barcode encoder for .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Question 6-1. How do you create a user-defined type in C# Question 6-2. What is the difference between a class and an object Question 6-3. Why should member fields be private Question 6-4. What is encapsulation Question 6-5. What is specialization and how is it implemented in C# Question 6-6. What is polymorphism Question 6-7. What is the difference between the is-a and the has-a relationship Question 6-8. What are access modifiers Question 6-9. Describe the differences between state, capabilities, and responsibilities. Question 6-10. What is a use-case scenario
Universal Product Code Version A Encoder In Visual C#
Using Barcode encoder for VS .NET Control to generate, create UPC Symbol image in VS .NET applications.
www.OnBarcode.com
GTIN - 12 Creator In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create UPC-E Supplement 5 image in .NET applications.
www.OnBarcode.com
Test Your Knowledge: Exercises
Code 128A Generator In .NET Framework
Using Barcode maker for Reporting Service Control to generate, create Code128 image in Reporting Service applications.
www.OnBarcode.com
Code 128B Creator In Objective-C
Using Barcode maker for iPad Control to generate, create ANSI/AIM Code 128 image in iPad applications.
www.OnBarcode.com
Exercise 6-1. A visual representation of a class, its member fields and methods, and its place in the hierarchy is called a class diagram. There are several accepted methods for drawing a class diagram, but we won t hold you to any of those right now. For this exercise, simply draw a class diagram for a class named vehicle, listing some member fields and methods that you think that class should have. Then add to your diagram the derived classes car, boat, and plane, and list their fields and methods (remember that all derived classes inherit the fields and methods of their parent class).
Decoding UCC-128 In VB.NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Draw UPC A In .NET Framework
Using Barcode creation for .NET framework Control to generate, create UPC Symbol image in VS .NET applications.
www.OnBarcode.com
Test Your Knowledge: Exercises |
USS-128 Maker In None
Using Barcode generation for Online Control to generate, create UCC - 12 image in Online applications.
www.OnBarcode.com
Barcode Encoder In Objective-C
Using Barcode creator for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
Exercise 6-2. You ve defined a class as a diagram; now try defining one in code. Define a class Book, in which a book has a title, author, and ISBN, and the book can be read or shelved. You don t need to fill in the code for any methods you include; simply include a comment in the body, like we did for the Dog class earlier in the chapter.
Barcode Reader In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Barcode Scanner In VB.NET
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET applications.
www.OnBarcode.com
|
Recognize Code 3 Of 9 In .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Barcode Encoder In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
6: Object-Oriented Programming
Code-128 Generator In VB.NET
Using Barcode drawer for .NET framework Control to generate, create Code-128 image in VS .NET applications.
www.OnBarcode.com
EAN 13 Drawer In Java
Using Barcode generation for Java Control to generate, create EAN 13 image in Java applications.
www.OnBarcode.com
7
Classes and Objects
In 3, we introduced you to the intrinsic types built into the C# language. Those simple types allow you to hold and manipulate numeric values and strings. The true power of C#, however, lies in its capacity to let the programmer define new types to suit particular problems. That ability to create new types is what characterizes an object-oriented language. You specify new types in C# by declaring and defining classes. Particular instances of a class are called objects. The difference between a class and an object is the same as the difference between the concept of a Dog and the particular dog who is sitting at your feet as you read this. You can t play fetch with the definition of a Dog, only with an instance. A Dog class describes what dogs are like; they have weight, height, eye color, hair color, disposition, and so forth. They also have actions they can take, such as eat, walk, bark, and sleep. A particular dog (such as Jesse s dog, Milo) will have a specific weight (62 pounds), height (22 inches), eye color (black), hair color (yellow), disposition (angelic), and so forth. He is capable of all the actions methods, in programming parlance of any dog (though if you knew him, you might imagine that eating is the only method he implements). The huge advantage of classes in object-oriented programming is that classes encapsulate the characteristics and capabilities of a type in a single, self-contained unit. Suppose, for example, that you want to sort the contents of an instance of a Windows listbox control. The listbox control is defined as a class. One of the properties of that class is that it knows how to sort itself. Sorting is encapsulated within the class, and the details of how the listbox sorts itself are not made visible to other classes. If you want a listbox sorted, you just tell the listbox to sort itself and it takes care of the details. So, you simply write a method that tells the listbox to sort itself and that s what happens. How it sorts is of no concern; that it does so is all you need to know.
As we noted in 6, this is called encapsulation, which, along with polymorphism and specialization, is one of three cardinal principles of object-oriented programming. 11 discusses polymorphism and inheritance. An old programming joke asks: how many object-oriented programmers does it take to change a lightbulb Answer: none, you just tell the lightbulb to change itself. This chapter explains the C# language features that are used to specify new classes. The elements of a class its behaviors and its state are known collectively as its class members. Class behavior is created by writing methods (sometimes called member functions). A method is a routine that every object of the class can execute. For example, a Dog class might have a Bark method, and a listbox class might have a Sort method. Class state is maintained by fields (sometimes called member variables). Fields may be primitive types (an int to hold the age of the dog or a set of strings to hold the contents of the listbox), or fields may be objects of other classes (for example, an Employee class may have a field of type Address). Finally, classes may also have properties, which act like methods to the creator of the class, but look like fields to clients of the class. A client is any object that interacts with instances of the class.
Copyright © OnBarcode.com . All rights reserved.