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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

When Web Intelligence users access a list of values, the lov file is cached as part of the user session on the Web Intelligence Report Server The name of the file is no longer objectlov but rather is a system-generated filename Designer automatically creates these query files whenever a universe designer enables a list of values on a universe object and the user requests a list of values for adding a condition to a query Unless a designer customizes the list of values, the SQL generated is always

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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

6:

Part II:

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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)

class Building { public int Floors; // number of floors public int Area; // total square footage of building public int Occupants; // number of occupants }

FIGURE 10-1 A list of values query is associated with an object in the universe It queries the dimension tables to present users with a pick list for conditions

The mass associated with the equivalent model therefore depends upon the amount of mechanical advantage provided by the lever formed by the rod and the pivot There are two ways to calculate the equivalent mass of a system The rst is to balance reaction forces as in the example above This method has an advantage in that the equations of motion are developed concurrently, though it is the more tedious of the two approaches The other method is to consider the kinetic energy of the original model and the lumped model Masses and inertias store energy in the form of kinetic energy, so for the lumped model to represent the original, the kinetic energy of the two systems must be the same This works not only for masses but also for inertias, as demonstrated in the following example