Java by API/javax.swing.event/TreeSelectionListener

implements TreeSelectionListener

   <source lang="java">

import java.awt.BorderLayout; import java.util.Enumeration; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeModel; import javax.swing.tree.TreeNode; import javax.swing.tree.TreePath; public class MainClass {

 public static void main(String args[]) {
   JFrame frame = new JFrame("Traverse Tree");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JTree tree = new JTree();
   tree.setRootVisible(true);
   TreeModel model = tree.getModel();
   Object rootObject = model.getRoot();
   if ((rootObject != null) && (rootObject instanceof DefaultMutableTreeNode)) {
     DefaultMutableTreeNode r = (DefaultMutableTreeNode) rootObject;
     printDescendents(r);
     Enumeration breadth = r.breadthFirstEnumeration();
     Enumeration depth = r.depthFirstEnumeration();
     Enumeration preOrder = r.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(path);
       System.out.println(path.getPath());
       System.out.println(path.getParentPath());
       System.out.println(((DefaultMutableTreeNode) path.getLastPathComponent()).getUserObject());
       System.out.println(path.getPathCount());
     }
   };
   tree.addTreeSelectionListener(treeSelectionListener);
   JScrollPane scrollPane = new JScrollPane(tree);
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 400);
   frame.setVisible(true);
 }
 private static void printEnumeration(Enumeration e, String label) {
   System.out.println("-----" + label + "-----");
   while (e.hasMoreElements()) {
     System.out.println(e.nextElement());
   }
 }
 public static void printDescendents(TreeNode root) {
   System.out.println(root);
   Enumeration children = root.children();
   if (children != null) {
     while (children.hasMoreElements()) {
       printDescendents((TreeNode) children.nextElement());
     }
   }
 }

}

      </source>