Traverse Tree : Tree « Swing JFC « Java

Traverse Tree

Traverse Tree
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski     
ISBN: 1-893115-78-X
Publisher: APress

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.awt.*;
import java.util.*;

public class TraverseTree {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Traverse Tree");
    Object footballNodes[] = { "Giants", "Jets", "Bills" };
    Vector footballVector = new NamedVector("Football", footballNodes);
    Object newYorkNodes[] = { "Mets", "Yankees", "Rangers", footballVector };
    Vector newYorkVector = new NamedVector("New York", newYorkNodes);
    Object bostonNodes[] = { "Red Sox", "Celtics", "Bruins" };
    Vector bostonVector = new NamedVector("Boston", bostonNodes);
    Object denverNodes[] = { "Rockies", "Avalanche", "Broncos" };
    Vector denverVector = new NamedVector("Denver", denverNodes);
    Object rootNodes[] = { newYorkVector, bostonVector, denverVector };
    Vector rootVector = new NamedVector("Root", rootNodes);
    JTree tree = new JTree(rootVector);
    TreeModel model = tree.getModel();
    Object rootObject = model.getRoot();
    if ((rootObject != null)
        && (rootObject instanceof DefaultMutableTreeNode)) {
      DefaultMutableTreeNode root = (DefaultMutableTreeNode) rootObject;
      //    printDescendents(root);
      Enumeration breadth = root.breadthFirstEnumeration();
      Enumeration depth = root.depthFirstEnumeration();
      Enumeration preOrder = root.preorderEnumeration();
      printEnumeration(breadth, "Breadth");
      //      printEnumeration(depth, "Depth");
      //      printEnumeration(preOrder, "Pre");

    TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
        JTree treeSource = (JTree) treeSelectionEvent.getSource();
        TreePath path = treeSource.getSelectionPath();
        System.out.println(((DefaultMutableTreeNode) path

    JScrollPane scrollPane = new JScrollPane(tree);
    frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 400);

  private static void printEnumeration(Enumeration e, String label) {
    System.out.println("-----" + label + "-----");
    while (e.hasMoreElements()) {

  public static void printDescendents(TreeNode root) {
    Enumeration children = root.children();
    if (children != null) {
      while (children.hasMoreElements()) {
        printDescendents((TreeNode) children.nextElement());

class NamedVector extends Vector {
  String name;

  public NamedVector(String name) { = name;

  public NamedVector(String name, Object elements[]) { = name;
    for (int i = 0, n = elements.length; i < n; i++) {

  public String toString() {
    return "[" + name + "]";

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49.Creating a JTree Component
50.Changing and Removing the Default Icons in a JTree Component
51.Use UIManager to change the default icon for JTree
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57.Find the path regardless of visibility that matches the specified sequence of names
58.Adding a Node to a JTree Component
59.Returns a TreePath containing the specified node.
60.Converting All Nodes in a JTree Component to a TreePath Array
61.Get path for all expanded or not expanded tree pathes
62.Expanding or Collapsing All Nodes in a JTree Component
63.Preventing the Expansion or Collapse of a Node in a JTree Component
64.Listening for Selection Events in a JTree Component
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