Help with Jtree for a file navigator

Question

Hi there,
I'm trying to do something with a JTree, but I can't find anywhere how to perform that.
I'm making a little file explorer, with a JTree to navigate through the file structure. I have also two buttons (up and back). When I select a directory with the mouse, the corresponding node is highlighted, but when I push the button up, or the button back, it isn't (I mean, the directory is caught well, but no nodes are highlighted). It uses the DefaultTreeCellRenderer
Any ideas to highlight the directory when I push the up or back button?.
Thank you very much!!!!

Answer 1

Strange. Does this small, simplified example work for you?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Xxx extends JFrame implements ActionListener {
  private JTree tree = new JTree();
  private JButton butt = new JButton("!");
  public static void main(String[] args) {
    new Xxx();
  public Xxx() {
    getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
    getContentPane().add(butt, BorderLayout.SOUTH);
    butt.addActionListener(this);
    pack();
    setVisible(true);
  public void actionPerformed(ActionEvent e) {
    int[] rows = tree.getSelectionRows();
    if ((rows != null) && (rows.length == 1)) {
      int next = rows[0] + 1;
      if (next >= tree.getRowCount()) {
        next = 0;
      tree.setSelectionRow(next);
}