Traverse JTree in Java

 /*from   ww w  . jav a2  s  .  co  m*/


import java.awt.BorderLayout;
import java.util.Enumeration;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeNode;

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
    DefaultMutableTreeNode mercury = new DefaultMutableTreeNode("Mercury");
    root.add(mercury);
    DefaultMutableTreeNode venus = new DefaultMutableTreeNode("Venus");
    root.add(venus);
    DefaultMutableTreeNode mars = new DefaultMutableTreeNode("java2s.com");
    root.add(mars);
    JTree tree = new JTree(root);

    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);

    printDescendants(root);
  }

  public static void printDescendants(TreeNode root) {
    System.out.println(root);
    Enumeration children = root.children();
    if (children != null) {
      while (children.hasMoreElements()) {
        printDescendants((TreeNode) children.nextElement());
      }
    }
  }
}