Complete set: Intro to C - Bill Buchanan

More documents

Recommendations

Info

7 Objects 7.1 Introduction This module covers the key elements of arrays, indexers and collections. It covers: • Classes and objects. This revises the material covered in Module 1. • Using encapsulation. • Defining Object‐Oriented Systems. • Inheritance. • Abstract classes. • Sealed classes. • Overriding classes. 7.2 Classes and objects duction to .NET Intro We live in a world full of objects; so object‐oriented programming is a natural technique in developing programs. For example, we have an object called a cup, and each cup has a number of properties, such as its colour, its shape, its size, and so on. It is efficient for us to identify it as a cup, as we know that cups should be able to hold liquid, and we will place our cup beside all the other cups that we have. If we were a cup designer then we could list all the possible properties of a cup, and for each design, we could set the properties of the cup. Of course, some of the properties might not actually be used, but for a general‐purpose design, we would specify every property that a cup might have. For example, in a simple case we could have the following properties: Properties Cup 1 Cup 2 Cup3 Shape (Standard/Square/Mug) Standard Square Mug Colour (Red/Blue/Green) Blue Red Green Size (Small/Medium/Large) Small Large Small Transparency (0 to 100%) 100% 50% 25% Handle type (Small/Large) Small Small Large Thus, we have three choices of shape (square, standard or mug), three choices of colour (red, blue or green), three choices in size (small, medium or large) and two Agilent .NET Course: Objects 2
choices of handle type (small or large). In addition, we can also choose a level of transparency of the cup from 0 to 100% (in integer steps). In object‐oriented program, the collection of properties is known as a class. Thus, we could have a class for our cup which encapsulates all the design parameters for our cup. The instance of our class, such as Cup 1, Cup 2 and Cup 3, are known as objects. We can create many objects from our class. Along with this, there are certain things that we want to do with the cup, such as picking it up, painting it, or even dropping it. In objectorientation, these are known as methods, and are the functions that can be allowed to operate on our objects. Program 7.1 shows an object‐oriented example of the cup, where a class named Cup is created, of which an instance is named cup. A full description on this program will be discussed in a later module. It uses variables, such as Shape, Colour, and Size to define the property of an object. Program 7.1: Program1_1_ClassSimpleCup using System; namespace ConsoleApplication2 { public class Cup { public string Shape; public string Colour; public string Size; public int Transparency; public string Handle; duction to .NET Intro public void DisplayCup() { System.Console.WriteLine("Cup is {0}, {1}", Colour, Handle); } } class Class1 { static void Main(string[] args) { Cup cup = new Cup(); cup.Colour = "Red"; cup.Handle = "Small"; cup.DisplayCup(); cup.Colour = "Green"; cup.Handle = "Small"; cup.DisplayCup(); System.Console.ReadLine(); } } } Sample Run Cup is Red, Small Cup is Green, Small In the following example, we create a class named Circuit, of which we create a new instance of it named cir. The class then has two methods, named Serial and Parallel. Agilent .NET Course: Objects 3
Page 1 and 2:
Name: Course: Introduction to .NET
Page 3 and 4:
Thus, we have three choices of shap
Page 5 and 6:
Finally, for this section, Program
Page 7 and 8:
1.3.1 Win32 API The Win32 API libra
Page 9 and 10:
VB VB ASP ASP ASP ASP VBA VBA VB VB
Page 11 and 12:
Volume in drive C has no label. Vol
Page 13 and 14:
Module01_01.sln Module01_01.sln Mic
Page 15 and 16:
1.4.2 Using the environment Figure
Page 17 and 18:
Figure 1.17: Object browsing for ot
Page 19 and 20:
1.6 Basic elements of a C# program
Page 21 and 22:
System.Console.Write("Enter real va
Page 23 and 24:
2 Module 2 Basics of C# 2.1 Introdu
Page 25 and 26:
2.4 Casting Objects Sometimes we ne
Page 27 and 28:
2.6 The Convert class The convert c
Page 29 and 30:
2.7.1 Examples of output of the Dat
Page 31 and 32:
2.9 StreamReader The StreamReader c
Page 33 and 34:
2.11 CIA tutorial (1) In this tutor
Page 35 and 36:
3 Arrays and Collections 3.1 Introd
Page 37 and 38:
inputValues = new double[5]; which
Page 39 and 40:
4 is YELLOW 5 is GREEN Program 3.3
Page 41 and 42:
3.3 Reading from a CSV file One of
Page 43 and 44:
ow. This is similar to a spreadshee
Page 45 and 46:
• System.Runtime.Serialization
Page 47 and 48: class ArrayExample02 { static void
Page 49 and 50: Sample Run 3.8 Average is 4.7142857
Page 51 and 52: Key IsFixedSize IsReadOnly Value Ge
Page 53 and 54: Program 3.11: Program3_11_HashTable
Page 55 and 56: 4 Types and Debugging 4.1 Introduct
Page 57 and 58: } } Sample Run Error! Reference so
Page 59 and 60: Thus the result of this is that arr
Page 61 and 62: 4.6 Converting data types The Syste
Page 63 and 64: duction to .NET Intro System.Compon
Page 65 and 66: duction to .NET Intro System.Enterp
Page 67 and 68: duction to .NET Intro System.Reflec
Page 69 and 70: duction to .NET Intro System.Runtim
Page 71 and 72: duction to .NET Intro System.Web.Ht
Page 73 and 74: duction to .NET Intro System.Window
Page 75 and 76: Name: Course: Introduction to .NET
Page 77 and 78: 5.2 Overloaded Methods An overloade
Page 79 and 80: 5.5 Contributing to Intellisense We
Page 81 and 82: 5.8 Throwing Exceptions We may deli
Page 83 and 84: 5.11 Regular Expressions Use of reg
Page 85 and 86: The following problem appeared as E
Page 87 and 88: user enters an illegal filename (su
Page 89 and 90: 5.15 Methods Tutorial We return to
Page 91 and 92: Name: Course: Introduction to .NET
Page 93 and 94: 6.2 Cerebus The run time environmen
Page 95 and 96: protected override void UserRun() {
Page 97: Name: Course: Introduction to .NET
Page 101 and 102: Finally, for this section, Program
Page 103 and 104: } class Class1 { static void Main(s
Page 105 and 106: Mammals Increasing generalisation C
Page 107 and 108: } } static void Main() { Applicatio
Page 109 and 110: } public void ToLowerCase() { name=
Page 111 and 112: Program 7.8: using System; namespac
Page 113 and 114: Program 7.9: using System; namespac
Page 115 and 116: Sample Run Name: fred Name: FRED Ob
Page 117 and 118: 8 More Objects 8.1 Introduction Thi
Page 119 and 120: Program 8.1: using System; interfac
Page 121 and 122: 8.2.1 Combining interfaces New inte
Page 123 and 124: { static void Main() { Circuit cir
Page 125 and 126: class Class1 { static void Main(str
Page 127 and 128: class Class1 { static void Main(str
Page 129 and 130: date: September 2003 ///change hist
Page 131 and 132: 10 Day 5 pm 10.1 Contents Morning s
Page 133 and 134: We can create the required method i
Page 135 and 136: 10.4 Any Others Term Example Explan
Page 137 and 138: uk.Gdp = 1000000000; int c = uk.Reg
Page 139 and 140: We keep a record of the country tha
Page 141: 10.9 Tutorial duction to .NET Intro
show all

Complete set: Intro to C - Bill Buchanan

Create successful ePaper yourself

Delete template?

Save as template?