JFrame frame = new JFrame(“Adding a Node to a JTree
Component!”);
JPanel panel = new JPanel();
DefaultMutableTreeNode myComputer = new
DefaultMutableTreeNode(“My Computer”);
DefaultMutableTreeNode c = new
DefaultMutableTreeNode(“Local Disk(C:)”);
DefaultMutableTreeNode vinod = new
DefaultMutableTreeNode(“Vinod”);
DefaultMutableTreeNode swing = new
DefaultMutableTreeNode(“Swing”);
DefaultMutableTreeNode tr = new
DefaultMutableTreeNode(“Tree”);
DefaultMutableTreeNode a = new
DefaultMutableTreeNode(“3½ Floppy(A:)”);
DefaultMutableTreeNode e = new
DefaultMutableTreeNode(“New Volume(E:)”);
c.add(vinod); vinod.add(swing); swing.add(tr);
myComputer.add(c);
myComputer.add(a);
myComputer.add(e);
tree = new JTree(myComputer);
JButton button = new JButton(“Add Tree”);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
model = (DefaultTreeModel)tree.getModel();
String nodeName = JOptionPane.showInputDialog(null, “Enter
the node name:”);
if(nodeName.equals(“”)){
JOptionPane.showMessageDialog(null, “Node is not added in
the tree!”);
}
else{
// create a new node
nNode = new DefaultMutableTreeNode(nodeName);
path = tree.getNextMatch(“M”, 0, Position.Bias.Forward);
node = (MutableTreeNode)path.getLastPathComponent();
model.insertNodeInto(nNode, node, node.getChildCount());
JOptionPane.showMessageDialog(null, “Node is added in the
tree!”); } } });
panel.add(tree);
panel.add(button);
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.getRootPane().setWindow
DecorationStyle(JRootPane.PLAIN_DIALOG);
frame.setSize(200,200);
frame.setVisible(true);
}}