import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class Puu1 extends JPanel implements TreeSelectionListener{
   JTree puu;
   JTextField tf=new JTextField(10);
   public Puu1(){
      //puu=new JTree(new Object[]{"Juku", "Kati", "Mati"});
      DefaultMutableTreeNode juur=new DefaultMutableTreeNode("klass");
      DefaultMutableTreeNode laps1=new DefaultMutableTreeNode("Juku");
      DefaultMutableTreeNode laps2=new DefaultMutableTreeNode("Kati");
      DefaultMutableTreeNode laps3=new DefaultMutableTreeNode("Mati");
      DefaultMutableTreeNode koer1=new DefaultMutableTreeNode("Muki");
      DefaultMutableTreeNode koer2=new DefaultMutableTreeNode("Pontu");
      juur.add(laps1);
      juur.add(laps2);
      juur.add(laps3);
      laps1.add(koer2);
      laps2.add(koer1);
      puu=new JTree(juur);
      add(puu);
      puu.addTreeSelectionListener(this);
      add(tf);
   }
   public void valueChanged(TreeSelectionEvent e){
      //tf.setText(puu.getLastSelectedPathComponent().toString());
      Object[] jada=puu.getSelectionPath().getPath();
      StringBuffer sb=new StringBuffer(jada[0].toString());
      for(int i=1; i<jada.length; i++){
        sb.append(" -> "+jada[i]);
      }
      tf.setText(sb.toString());
   }
   
   public static void main(String[] arg){
      JFrame f=new JFrame("Puu");
      f.add(new Puu1());
      f.setSize(400, 400);
      f.setVisible(true);
   }
}