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Swing defines four types of buttons: JButton, JToggleButton, JCheckBox, and JRadioButton All are subclasses of the AbstractButton class, which extends JComponent Thus, all buttons share a set of common traits AbstractButton contains many methods that allow you to control the behavior of buttons For example, you can define different icons that are displayed for the button when it is disabled, pressed, or selected Another icon can be used as a rollover icon, which is displayed when the mouse is positioned over a button The following methods set these icons: void setDisabledIcon(Icon di) void setPressedIcon(Icon pi) void setSelectedIcon(Icon si) void setRolloverIcon(Icon ri) Here, di, pi, si, and ri are the icons to be used for the indicated purpose The text associated with a button can be read and written via the following methods: String getText( ) void setText(String str) Here, str is the text to be associated with the button The model used by all buttons is defined by the ButtonModel interface A button generates an action event when it is pressed Other events are possible Each of the concrete button classes is examined next

The Stage 2 images actually consist of two types of images: the intermediate (optional image) and the actual stage2 image file To further blur things, the optional images are called Stage 15 The Stage 15 images serve as a bridge between Stage 1 and Stage 2 The Stage 15 images are file system specific; that is, they understand the semantics of one file system or the other The Stage 15 images have names of the form x_stage_1_5 where x can be a file system of type e2fs, reiserfs, fat, jfs, minix, xfs, etc For example, the Stage 15 image that will be required to load an operating system (OS) that resides on a File Allocation Table (FAT) file system will have a name like fat_ stage1_5 The Stage 15 images allow GRUB to access several file systems When used, the Stage 15 image helps to locate the Stage 2 image as a file within the file system Next comes the actual stage2 image It is the core of GRUB It contains the actual code to load the kernel that boots the OS, it displays the boot menu, and it also contains the GRUB shell from which GRUB commands can be entered The GRUB shell is interactive and helps to make GRUB flexible For example, the shell can be used to boot items that are not currently listed in GRUB s boot menu or to bootstrap the OS from an alternate supported medium Other types of Stage 2 images are the stage2_eltorito image, the nbgrub image, and the pxegrub image The stage2_eltorito image is a boot image for CD-ROMs The nbgrub and pxegrub images are both network-type boot images that can be used to bootstrap a system over the network (using Bootstrap Protocol [BOOTP], Dynamic Host Configuration Protocol [DHCP], Preboot Execution Environment [PXE], Etherboot, or the like) A quick listing of the contents of the /boot/grub directory of most Linux distributions will show some of the GRUB images.

The JButton class provides the functionality of a push button You have already seen a simple form of it in the preceding chapter JButton allows an icon, a string, or both to be associated with the push button Three of its constructors are shown here: JButton(Icon icon) JButton(String str) JButton(String str, Icon icon) Here, str and icon are the string and icon used for the button When the button is pressed, an ActionEvent is generated Using the ActionEvent object passed to the actionPerformed( ) method of the registered ActionListener, you can obtain the action command string associated with the button By default, this is the string displayed inside the button However, you can set the action command by calling setActionCommand( ) on the button You can obtain the action command by calling getActionCommand( ) on the event object It is declared like this: String getActionCommand( ) The action command identifies the button Thus, when using two or more buttons within the same application, the action command gives you an easy way to determine which button was pressed

Part III:

In reality, having text files hold configuration information usually turns out to be an efficient method Once set, they rarely need to be changed; even so, they are straight text files and thus easy to view when needed Even more helpful is that it s easy to write scripts to read the same configuration files and modify their behavior accordingly This is especially helpful when automating server maintenance operations, which is crucial in a large site with many servers

each of these tasks to finish before it can proceed to the next one even though the CPU is sitting idle most of the time Multithreading lets you gain access to this idle time and put it to good use If you have programmed for operating systems such as Windows, then you are already familiar with multithreaded programming However, the fact that Java manages threads makes multithreading especially convenient, because many of the details are handled for you

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Figure 14-13. The generated number will stay on the LCD screen until the left button is pressed. Another NUMBER TO TEXT block is shown in Figure 14-3. This will pass the second random number generated to the next DISPLAY block.