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Besides declaring a variable s name and type, a declaration can also initialize its memory to a specific value. A variable initializer consists of an equals sign followed by the initializing value, as shown here: Initializer int var2 = 17; Local variables without initializers have an undefined value, and cannot be used until they have been assigned a value. Attempting to use an undefined local variable causes the compiler to produce an error message. Figure 3-12 shows a number of local variable declarations on the left, and the resulting stack configuration on the right. Some of the variables have initializers and others do not.

import javax.swing.*; import javax.swing.table.*; import java.awt.*; public class SortedTable { public static void main(String args[]) { Runnable runner = new Runnable() { public void run() { JFrame frame = new JFrame("Sorting JTable"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Object rows[][] = { {"AMZN", "Amazon", 44.36}, {"EBAY", "eBay", 44.84}, {"GOOG", "Google", 463.63}, {"MSFT", "Microsoft", 27.14}, {"N", "Inco Ltd.", 44.57}, {"O", "Realty Income Corp.", 23.15}, {"SUNW", "Sun Microsystems", 4.40}, {"T", "AT&T", 24.96}, {"TIVO", "Tivo Inc", 5.45}, {"X", "US Steel", 49.54}, {"Y", "Alleghany", 280.00} }; String columns[] = {"Symbol", "Name", "Price"}; TableModel model = new DefaultTableModel(rows, columns); JTable table = new JTable(model); RowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model); table.setRowSorter(sorter); JScrollPane pane = new JScrollPane(table); frame.add(pane, BorderLayout.CENTER); frame.setSize(300, 150); frame.setVisible(true); } }; EventQueue.invokeLater(runner); } }

Some kinds of variables are automatically set to default values if they are declared without an initializer, and others are not. Variables that are not automatically initialized to default values contain undefined values until the program assigns them a value. Table 3-5 shows which types of variables are automatically initialized and which are not. I will cover each of the five variable types later in the text. Table 3-5. Types of Variables

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

There is one key thing worth mentioning here. Clicking the last column will sort the table based on the last column value, as shown in Figure 4-19.

Used for local computation inside a function member Members of a class Members of a struct Used for passing values into and out of a method Members of an array

You can declare multiple variables in a single declaration statement. The variables in a multiple-variable declaration must all be of the same type. The variable names must be separated with commas. Initializers can be included with the variable names. For example, the following code shows two valid declaration statements with multiple variables. Notice that the initialized variables can be mixed with uninitialized variables as long as they are separated by commas. The last declaration statement is invalid because it attempts to declare different types of variables in a single statement. // Variable declarations--some with initializers, some without int var3 = 7, var4, var5 = 3; double var6, var7 = 6.52; Type Different type int var8, float var9;

There are arguments both for and against a class having more than one parent (plus the parent that is the step of the designing process), the condition known as multiple inheritance. There are times when a class could logically inherit from two (or more) different classes, each accounting for a different aspect of the inheriting class. (For example, a square is both a rectangle and a rhombus.) But the compilation of a multiple inheritance in which each parent class has the same-named function causes a conflict, which must be resolved with explicit (manual) decision making for each conflict. (For example, a rectangle s area involves its length and its width, while a rhombus s involves its length and its acute angle; further, a square s involves just its length.) In essence, for each, it must be determined which parent has the dominant gene and which have the recessive; generally, the dominant function is the one that has the most functionality. This is resolved in a wholesale way sometimes by convention, sometimes by language restriction by combining only one class for implementations with any number of classes for interfaces.

Notice that the value 280.0 is between 27.14 and 4.4. By default, the elements of a DefaultTableModel are of type Object. In order to do numeric sorting, you have to change the data type of the column. This involves overriding the getColumnClass() method of DefaultTableModel:

// Error! Can't mix types (int & float)

// This line is reached only when x is 3 or greater. Console.WriteLine("Value of x is {0}", x); x++; }