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that lets the user enter a selection into the text field The JComboBox constructor used by the example is shown here: JComboBox(Object[ ] items) Here, items is an array that initializes the combo box Other constructors are available JComboBox uses the ComboBoxModel Mutable combo boxes (those whose entries can be changed) use the MutableComboBoxModel In addition to passing an array of items to be displayed in the drop-down list, items can be dynamically added to the list of choices via the addItem( ) method, shown here: void addItem(Object obj) Here, obj is the object to be added to the combo box This method must be used only with mutable combo boxes JComboBox generates an action event when the user selects an item from the list JComboBox also generates an item event when the state of selection changes, which occurs when an item is selected or deselected Thus, changing a selection means that two item events will occur: one for the deselected item and another for the selected item Often, it is sufficient to simply listen for action events, but both event types are available for your use One way to obtain the item selected in the list is to call getSelectedItem( ) on the combo box It is shown here: Object getSelectedItem( ) You will need to cast the returned value into the type of object stored in the list The following example demonstrates the combo box The combo box contains entries for France, Germany, Italy, and Japan When a country is selected, an icon-based label is updated to display the flag for that country You can see how little code is required to use this powerful component

6:

// Demonstrate JComboBox import javaawt*; import javaawtevent*; import javaxswing*; /* <applet code="JComboBoxDemo" width=300 height=100> </applet> */ public class JComboBoxDemo extends JApplet { JLabel jlab; ImageIcon france, germany, italy, japan; JComboBox jcb; String flags[] = { "France", "Germany", "Italy", "Japan" }; public void init() { try { SwingUtilitiesinvokeAndWait( new Runnable() { public void run() {

Part III:

NOTE The value of UUID used above was obtained from the existing entry in the menu1st file that we are duplicating The exact partition or volume on which the root file system ( / ) resides can also be specified; for example, we could have the kernel entry in the menu1st file as

be used to keep the number in Number format and not Text format. You ll use this ability now to send these original random numbers into the COMPARE block.

makeGUI(); } } ); } catch (Exception exc) { Systemoutprintln("Can't create because of " + exc); } } private void makeGUI() { // Change to flow layout setLayout(new FlowLayout()); // Instantiate a combo box and add it to the content pane jcb = new JComboBox(flags); add(jcb); // Handle selections jcbaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { String s = (String) jcbgetSelectedItem(); jlabsetIcon(new ImageIcon(s + "gif")); } }); // Create a label and add it to the content pane jlab = new JLabel(new ImageIcon("francegif")); add(jlab); } }

5 Create another entry that will change the foreground and background colors of the menu when selected The menu colors will be changed to yellow and black when this entry is selected Enter the following text at the end of the file (beneath the entry you created in the preceding step):

Output from the combo box example is shown here:

A tree is a component that presents a hierarchical view of data The user has the ability to expand or collapse individual subtrees in this display Trees are implemented in Swing by the JTree class A sampling of its constructors is shown here: JTree(Object obj[ ]) JTree(Vector< > v) JTree(TreeNode tn)

6 Comment out the splashimage entry at the top of the file The presence of the splash image will prevent your new custom foreground and background colors from displaying properly The commented-out entry for the splash image will look like this:

30:

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7 Finally, comment out the hiddenmenu entry from the file so that the Boot menu will appear, showing your new entries instead of being hidden The commentedout entry should look like