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his chapter introduces the class The class is the foundation of C# because it defines the nature of an object Furthermore, the class forms the basis for object-oriented programming Within a class are defined both code and data Because classes and objects are fundamental to C#, they constitute a large topic, which spans several chapters This chapter begins the discussion by covering their main features

We have been using classes since the start of this book Of course, only extremely simple classes have been used, and we have not taken advantage of the majority of their features Classes are substantially more powerful than the limited ones presented so far Let s begin by reviewing the basics A class is a template that defines the form of an object It specifies both the data and the code that will operate on that data C# uses a class specification to construct objects Objects are instances of a class Thus, a class is essentially a set of plans that specify how to build an object It is important to be clear on one issue: A class is a logical abstraction It is not until an object of that class has been created that a physical representation of that class exists in memory

When you define a class, you declare the data that it contains and the code that operates on it While very simple classes might contain only code or only data, most real-world classes contain both In general terms, data is contained in data members defined by the class, and code is contained in function members It is important to state at the outset that C# defines several specific flavors of data and function members For example, data members (also called fields) include instance variables and static variables Function members include methods, constructors, destructors, indexers, events, operators, and properties For now, we will limit our discussion of the class to its essential elements: instance variables and methods Later in this chapter constructors and destructors are discussed The other types of members are described in later chapters

4 It has come to our attention that Marybeth from Dallas Charlie from Portland Dee from Chicago and Brian from Phoenix all need to meet with the advertising team Add commas as follows:

5 2

Part I:

A class is created by use of the keyword class Here is the general form of a simple class definition that contains only instance variables and methods: class classname { // declare instance variables access type var1; access type var2; // access type varN; // declare methods access ret-type method1(parameters) { // body of method } access ret-type method2(parameters) { // body of method } // access ret-type methodN(parameters) { // body of method } } Notice that each variable and method declaration is preceded with access Here, access is an access specifier, such as public, which specifies how the member can be accessed As mentioned in 2, class members can be private to a class or more accessible The access specifier determines what type of access is allowed The access specifier is optional, and if absent, then the member is private to the class Members with private access can be used only by other members of their class For the examples in this chapter, all members (except for the Main( ) method) will be specified as public, which means that they can be used by all other code even code defined outside the class We will return to the topic of access specifiers in 8

more type modifiers These modifiers are discussed later in this book Although there is no syntactic rule that enforces it, a well-designed class should define one and only one logical entity For example, a class that stores names and telephone numbers will not normally also store information about the stock market, average rainfall, sunspot cycles, or other unrelated information The point here is that a well-designed class groups logically connected information Putting unrelated information into the same class will quickly destructure your code Up to this point, the classes that we have been using have had only one method: Main( ) However, notice that the general form of a class does not specify a Main( ) method A Main( ) method is required only if that class is the starting point for your program