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Attributes can be seen as defining the uniqueness (the unique combination of characteristics) of a class, attributed to a combination of influences. Inherited attributes are genetic characteristics, composed attributes are environmental characteristics, and current-class-defined attributes are differential characteristics. (By the way, the concept of a differential characteristic addresses the fact that living entities do not perfectly copy their genetic or environmental characteristics.)

Note For any object of a reference type, all its data members are stored in the heap, regardless of

support. You don t, however, typically use this class directly either. Instead, that s where TableRowSorter comes into play. It s a concrete implementation of the abstract DefaultRowSorter class. TableRowSorter is what you associated with the JTable to sort the shared model. The basic principle to enable sorting of a JTable is this simple:

Table 3-3 shows all the types available in C# and what kinds of types they are value types or reference types. Each type will be covered later in the text. Table 3-3. Value Types and Reference Types in C#

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The same core concepts can be looked at from a different direction, in terms of how each is implemented in code. Inheritance is accomplished in a class declaration, with a clause. Composition has two forms: static composition is specified with data declarations, which show that the class manages objects of other classes, for a particular set of purposes; and dynamic composition (polymorphism) is specified with data declarations using function parameters, which show that the object manages other objects. Aggregation (organized object collection) is defined with a dynamic composition hierarchy, which establishes grouped object references. And dependence is demonstrated by using messages, within one class or through a combination of classes; this is indirect usage. Table 2-1 summarizes these implementations. Table 2-1. Core Concepts in Code Concept

A general-purpose programming language must allow a program to store and retrieve data. A variable is a name that represents data stored in memory during program execution. C# provides four categories of variables, each of which will be discussed in detail. These kinds are listed in Table 3-4. Table 3-4. The four types of variables

TableModel model = ...; JTable table = new JTable(model); RowSorter sorter = new TableRowSorter(model); table.setRowSorter(sorter);

These hold temporary data within the scope of a method. These hold data associated with a type. These temporary variables are used to pass data from one method to another method. These are used to store temporary or type-associated data.

Class declaration Data declaration Data declaration using parameter passed in Set of data declaration using parameters passed in Message

Notice that the same model is passed into both constructors here: JTable and TableRowSorter. At this point, your table s rows can be sorted by a user clicking on a table column header, as shown in Figure 4-17 (before) and Figure 4-18 (after). The black arrow next to the Name header indicates that it is the sort key column. The arrow doesn t appear until a sort key column has been identified, which is why Figure 4-17 has none.

A variable must be declared before it can be used. The variable declaration defines the variable, and accomplishes two things: It gives the variable a name and associates a type with it. It allows the compiler to allocate memory for it. A simple variable declaration requires at least a type and a name. The following declaration defines a variable named var2, of type int: Type int var2; Name For example, Figure 3-11 represents the declaration of four variables and their places on the stack.

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