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In the first form, the tree is constructed from the elements in the array obj The second form constructs the tree from the elements of vector v In the third form, the tree whose root node is specified by tn specifies the tree Although JTree is packaged in javaxswing, its support classes and interfaces are packaged in javaxswingtree This is because the number of classes and interfaces needed to support JTree is quite large JTree relies on two models: TreeModel and TreeSelectionModel A JTree generates a variety of events, but three relate specifically to trees: TreeExpansionEvent, TreeSelectionEvent, and TreeModelEvent TreeExpansionEvent events occur when a node is expanded or collapsed A TreeSelectionEvent is generated when the user selects or deselects a node within the tree A TreeModelEvent is fired when the data or structure of the tree changes The listeners for these events are TreeExpansionListener, TreeSelectionListener, and TreeModelListener, respectively The tree event classes and listener interfaces are packaged in javaxswingevent The event handled by the sample program shown in this section is TreeSelectionEvent To listen for this event, implement TreeSelectionListener It defines only one method, called valueChanged( ), which receives the TreeSelectionEvent object You can obtain the path to the selected object by calling getPath( ), shown here, on the event object TreePath getPath( ) It returns a TreePath object that describes the path to the changed node The TreePath class encapsulates information about a path to a particular node in a tree It provides several constructors and methods In this book, only the toString( ) method is used It returns a string that describes the path The TreeNode interface declares methods that obtain information about a tree node For example, it is possible to obtain a reference to the parent node or an enumeration of the child nodes The MutableTreeNode interface extends TreeNode It declares methods that can insert and remove child nodes or change the parent node The DefaultMutableTreeNode class implements the MutableTreeNode interface It represents a node in a tree One of its constructors is shown here: DefaultMutableTreeNode(Object obj) Here, obj is the object to be enclosed in this tree node The new tree node doesn t have a parent or children To create a hierarchy of tree nodes, the add( ) method of DefaultMutableTreeNode can be used Its signature is shown here: void add(MutableTreeNode child) Here, child is a mutable tree node that is to be added as a child to the current node JTree does not provide any scrolling capabilities of its own Instead, a JTree is typically placed within a JScrollPane This way, a large tree can be scrolled through a smaller viewport Here are the steps to follow to use a tree: 1 Create an instance of JTree 2 Create a JScrollPane and specify the tree as the object to be scrolled 3 Add the tree to the scroll pane 4 Add the scroll pane to the content pane.

Part III:

Carefully drag a data wire out of the second NUMBER TO TEXT block (the fourth one from the left) and into value A s input data plug. Do the same for the first NUMBER TO TEXT block (the third from the left) but drag this wire into value B s input data plug. This configuration is shown in Figure 15-7.

8 Save the changes you made to the file, and reboot the system The final /boot/grub/menu1st file (with some of the comment fields removed) will resemble the one shown here:

The following example illustrates how to create a tree and handle selections The program creates a DefaultMutableTreeNode instance labeled Options This is the top node of the tree hierarchy Additional tree nodes are then created, and the add( ) method is called to connect these nodes to the tree A reference to the top node in the tree is provided as the argument to the JTree constructor The tree is then provided as the argument to the JScrollPane constructor This scroll pane is then added to the content pane Next, a label is created and added to the content pane The tree selection is displayed in this label To receive selection events from the tree, a TreeSelectionListener is registered for the tree Inside the valueChanged( ) method, the path to the current selection is obtained and displayed

// Demonstrate JTree import javaawt*; import javaxswingevent*; import javaxswing*; import javaxswingtree*; /* <applet code="JTreeDemo" width=400 height=200> </applet> */

[root@fedora-serverA boot]# cat /boot/grub/menulst # grubconf generated by anaconda default=0 timeout=5 #splashimage=(hd0,0)/grub/splashxpmgz # hiddenmenu title Fedora (2625-14fc9i686) root (hd0,0) kernel /vmlinuz-2625-14fc9i686 ro root=UUID= 7db5-4c27 rhgb quiet initrd /initrd-2625-14fc9i686img title The Duplicate Kernel color yellow/black root (hd0,0) kernel /duplicate-kernel ro root=UUID=7db5-4c27 initrd /duplicate-initrdimg title The change color entry color yellow/black

public class JTreeDemo extends JApplet { JTree tree; 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() { // Create top node of tree DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options"); // Create subtree of "A" DefaultMutableTreeNode a = new DefaultMutableTreeNode("A"); topadd(a); DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1"); aadd(a1); DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2"); aadd(a2);

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