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NOTE In addition to an access specifier, the declaration of a class member can also contain one or
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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
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Define a Class
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To illustrate classes, we will be evolving a class that encapsulates information about buildings, such as houses, stores, offices, and so on This class is called Building, and it will store three
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6:
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Introducing Classes and Objects
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items of information about a building: the number of floors, the total area, and the number of occupants The first version of Building is shown here It defines three instance variables: Floors, Area, and Occupants Notice that Building does not contain any methods Thus, it is currently a data-only class (Subsequent sections will add methods to it)
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class Building { public int Floors; // number of floors public int Area; // total square footage of building public int Occupants; // number of occupants }
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PART I
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The instance variables defined by Building illustrate the way that instance variables are declared in general The general form for declaring an instance variable is shown here: access type var-name; Here, access specifies the access; type specifies the type of variable; and var-name is the variable s name Thus, aside from the access specifier, you declare an instance variable in the same way that you declare local variables For Building, the variables are preceded by the public access modifier As explained, this allows them to be accessed by code outside of Building A class definition creates a new data type In this case, the new data type is called Building You will use this name to declare objects of type Building Remember that a class declaration is only a type description; it does not create an actual object Thus, the preceding code does not cause any objects of type Building to come into existence To actually create a Building object, you will use a statement like the following:
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Building house = new Building(); // create an object of type building
After this statement executes, house will be an instance of Building Thus, it will have physical reality For the moment, don t worry about the details of this statement Each time you create an instance of a class, you are creating an object that contains its own copy of each instance variable defined by the class Thus, every Building object will contain its own copies of the instance variables Floors, Area, and Occupants To access these variables, you will use the member access operator, which is a period It is commonly referred to as the dot operator The dot operator links the name of an object with the name of a member The general form of the dot operator is shown here: objectmember Thus, the object is specified on the left, and the member is put on the right For example, to assign the Floors variable of house the value 2, use the following statement:
houseFloors = 2;
In general, you can use the dot operator to access both instance variables and methods Here is a complete program that uses the Building class:
// A program that uses the Building class using System;
Part I:
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