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that you will normally implement the ActionListener interface Recall that the only method defined by ActionListener is actionPerformed( ) Inside this method, you can use a number of different ways to determine which button was selected First, you can check its action command by calling getActionCommand( ) By default, the action command is the same as the button label, but you can set the action command to something else by calling setActionCommand( ) on the radio button Second, you can call getSource( ) on the ActionEvent object and check that reference against the buttons Finally, you can simply check each radio button to find out which one is currently selected by calling isSelected( ) on each button Remember, each time an action event occurs, it means that the button being selected has changed and that one and only one button will be selected The following example illustrates how to use radio buttons Three radio buttons are created The buttons are then added to a button group As explained, this is necessary to cause their mutually exclusive behavior Pressing a radio button generates an action event, which is handled by actionPerformed( ) Within that handler, the getActionCommand( ) method gets the text that is associated with the radio button and uses it to set the text within a label

TIP You can also use the cat command to do the same thing as in the last two steps in a single shot The command to do this will be

// Demonstrate JRadioButton import javaawt*; import javaawtevent*; import javaxswing*; /* <applet code="JRadioButtonDemo" width=300 height=50> </applet> */ public class JRadioButtonDemo extends JApplet implements ActionListener { JLabel jlab; public void init() { try { SwingUtilitiesinvokeAndWait( new Runnable() { public void run() { makeGUI(); } } ); } catch (Exception exc) { Systemoutprintln("Can't create because of " + exc); } } private void makeGUI() { // Change to flow layout setLayout(new FlowLayout()); // Create radio buttons and add them to content pane JRadioButton b1 = new JRadioButton("A"); b1addActionListener(this); add(b1);

30:

Your GRUB floppy is now ready You can now boot off of this floppy so that you can install the GRUB boot loader

JRadioButton b2 = new JRadioButton("B"); b2addActionListener(this); add(b2); JRadioButton b3 = new JRadioButton("C"); b3addActionListener(this); add(b3); // Define a button group ButtonGroup bg = new ButtonGroup(); bgadd(b1); bgadd(b2); bgadd(b3); // Create a label and add it to the content pane jlab = new JLabel("Select One"); add(jlab); } // Handle button selection public void actionPerformed(ActionEvent ae) { jlabsetText("You selected " + aegetActionCommand()); } }

Output from the radio button example is shown here:

Make sure that the GRUB floppy you created is inserted into the floppy disk drive Reboot the system and use the floppy as your boot medium (adjust the BIOS settings if necessary) After the system has booted off the GRUB floppy, you will be presented with a grub> prompt Set the root device for GRUB to your boot partition (or the partition that contains the /boot directory) On our sample system, the /boot directory resides on the /dev/sda1 (hd0,0) partition To do this, type the following command:

JTabbedPane encapsulates a tabbed pane It manages a set of components by linking them with tabs Selecting a tab causes the component associated with that tab to come to the forefront Tabbed panes are very common in the modern GUI, and you have no doubt used them many times Given the complex nature of a tabbed pane, they are surprisingly easy to create and use JTabbedPane defines three constructors We will use its default constructor, which creates an empty control with the tabs positioned across the top of the pane The other two constructors let you specify the location of the tabs, which can be along any of the four sides JTabbedPane uses the SingleSelectionModel model Tabs are added by calling addTab( ) Here is one of its forms: void addTab(String name, Component comp) Here, name is the name for the tab, and comp is the component that should be added to the tab Often, the component added to a tab is a JPanel that contains a group of related components This technique allows a tab to hold a set of components

Part III:

grub> root (hd0,0)

Now we re ready to see how the COMPARE block works. (Sorry it took so long to get here, but the COMPARE block by itself can t do anything we need a good example with things to compare to see it in action.) I m going to break off a new beam to run in parallel. To do this, I hold down the Shift key and drag an extra beam, shown in Figure 15-5.