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

public class JTreeSample extends JFrame
                         implements TreeSelectionListener {
   DefaultMutableTreeNode top
                    = new DefaultMutableTreeNode("top");
   DefaultMutableTreeNode sub1
                    = new DefaultMutableTreeNode("sub1");
   DefaultMutableTreeNode sub2
                    = new DefaultMutableTreeNode("sub2");
   DefaultMutableTreeNode sub1_1
                    = new DefaultMutableTreeNode("sub1-1");
   DefaultMutableTreeNode sub1_2
                    = new DefaultMutableTreeNode("sub1-2");
   DefaultMutableTreeNode sub1_3
                    = new DefaultMutableTreeNode("sub1-3");
   DefaultMutableTreeNode sub1_3_1
                    = new DefaultMutableTreeNode("sub1-3-1");
   JTreeSample() {
      JTree tree = new JTree(top);
      tree.setRootVisible(true);
      tree.addTreeSelectionListener(this);
      getContentPane().add(tree);

      top.add(sub1);
      top.add(sub2);
      sub1.add(sub1_1);
      sub1.add(sub1_2);
      sub1.add(sub1_3);
      sub1_3.add(sub1_3_1);

      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setTitle("JTreeを使ってツリーマップ（構造）を表示");
      setSize(530, 200);
      setVisible(true);
   }
   public void valueChanged(TreeSelectionEvent e) {
      JTree tree = (JTree)e.getSource();
      DefaultMutableTreeNode node =
        (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
      if (node != null) {
        System.out.println((String)node.getUserObject());
      }
   }
   public static void main(String[] args) {
      new JTreeSample();
   }
}