/* * TestJTree1.java * * Created on September 5, 2002, 11:12 AM */package ch17;import javax.swing.*;import javax.swing.tree.*;import javax.swing.event.*;import java.awt.*;import java.awt.event.*;import java.util.*;/** * * @author  Stephen Potts */public class TestJTree1 extends JFrame implements TreeSelectionListener{    private JTree tree1;    private JTextField jtf;        /** Creates a new instance of TestJTree1 */    public TestJTree1()    {        jtf = new JTextField(15);        jtf.setEditable(false);                Object[] league = {"nl", "al"};                Vector nlV = new Vector()         {             public String toString()            {                return "National League";            }        };                nlV.addElement("Braves");        nlV.addElement("Mets");        nlV.addElement("Cardinals");        nlV.addElement("Rockies" );                Vector alV = new Vector()         {             public String toString()            {                return "American League";            }        };                alV.addElement("Rangers");        alV.addElement("Twins");        alV.addElement("A's");        alV.addElement("White Sox" );                league[0] = nlV;        league[1] = alV;        tree1 = new JTree(league);        tree1.setRootVisible(true);        tree1.expandRow(0);                tree1.addTreeSelectionListener(this);                getContentPane().add(new JScrollPane(tree1),                                 BorderLayout.CENTER);        getContentPane().add(jtf, BorderLayout.SOUTH);                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        setBounds(100, 100, 300, 300);        setVisible(true);        setTitle("Using a JTree");    }        public void valueChanged(TreeSelectionEvent tse)    {        DefaultMutableTreeNode dmtn =         (DefaultMutableTreeNode) tree1.getLastSelectedPathComponent();        String name1 = (String) dmtn.getUserObject();        jtf.setText("you selected: " + name1);        jtf.setForeground(Color.black);    }        public static void main(String args[])    {        TestJTree1 tjt1 = new TestJTree1();    }}