How we add element dynamically in Tree in Swing?

To add an element dynamically , we will use three different classes.
Design Diagram for Tree:-

 public class TreeViewExample extends javax.swing.JFrame {
    /**
     * Creates new form TreeViewExample
     */
    DefaultTreeModel model;
    public TreeViewExample() {
        initComponents();
        model = (DefaultTreeModel) jTree1.getModel();
    }

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        DefaultMutableTreeNode root = (DefaultMutableTreeNode) jTree1.getModel().getRoot();

        DefaultMutableTreeNode child = new DefaultMutableTreeNode(jTextField1.getText());

        model.insertNodeInto(child, root, root.getChildCount());

    } 

}