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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:

Methods can be thought of in the following ways. Inherited methods are inherent functions, composed methods are adopted functions, and current-class-defined methods are created functions. Regarding another property of living entities, associated (external) methods are interdependent functions.

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

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

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#

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.)

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

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.

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.

Figure 4-18. After sorting a JTable Listing 4-8 demonstrates the sorting of a JTable. The table model offers a set of stock symbols, names, and prices, as shown in Figures 4-17 and 4-18.

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.

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