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TreeSelectionModel

import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreeModel; import javax.swing.tree.TreeSelectionModel; public class Main extends JFrame {   public Main() {     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     DefaultMutableTreeNode root = new DefaultMutableTreeNode("abcde");     DefaultMutableTreeNode node = new DefaultMutableTreeNode("1");     node.add(new DefaultMutableTreeNode("12345"));     node.add(new DefaultMutableTreeNode("testing"));     root.add(node);     root.add(new DefaultMutableTreeNode("1234567890"));     TreeModel tm = new DefaultTreeModel(root);     JTree tree = new JTree(tm);     tree.getSelectionModel().addTreeSelectionListener(new Selector());     tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);     getContentPane().add(tree, BorderLayout.CENTER);     pack();     setVisible(true);   }   private class Selector implements TreeSelectionListener {     public void valueChanged(TreeSelectionEvent event) {       Object obj = event.getNewLeadSelectionPath().getLastPathComponent();       System.out.println("" + obj.toString().length());     }   }   public static void main(String[] args) {     Main m = new Main();   } }