How to set icon for JTree

Question

hi,
I have a JTree. For this JTree i have a DefaultJTreeCellRenderer.
i have done like this
JTree tree = new JTree();
DefaultJTreeCellRenderer renderer = new DefaultJTreeCellRenderer();
renderer.setOpenIcon(....);
renderer.serCloseIcon(...);
tree.setCellRenderer(renderer);but this is not working.
how to change the icons of the node when i click
thank you

Answer 1

public class Test extends JFrame implements ActionListener {
     private static final long serialVersionUID = 1L;
     private JButton buttonCreate;
     private JTree tree;
     private DefaultMutableTreeNode defaultMutableTreeNode;
     private DefaultTreeModel defaultTreeModel;
     private int i;
     public Test() {
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          layoutComponents();
          setSize(400, 400);
          setLocationRelativeTo(null);
          setVisible(true);
     private void layoutComponents() {
          defaultMutableTreeNode = new DefaultMutableTreeNode("Root");
          defaultTreeModel = new DefaultTreeModel(defaultMutableTreeNode);
          tree = new JTree(defaultTreeModel);
          tree.setRootVisible(false);
          buttonCreate = new JButton("Create");
          getContentPane().setLayout(new BorderLayout());
          getContentPane().add(tree, BorderLayout.CENTER);
          getContentPane().add(buttonCreate, BorderLayout.SOUTH);
          DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
          ImageIcon icon_close = new ImageIcon("./images/project_closed.gif");
          ImageIcon icon_open = new ImageIcon("./images/project_opened.gif");
          renderer.setOpenIcon(icon_open);
          renderer.setClosedIcon(icon_close);
          tree.setCellRenderer(renderer);
          buttonCreate.addActionListener(this);
     public static void main(String[] args) {
          new Test();
     public void actionPerformed(ActionEvent e) {
          addElementToParent("Child" + i++);
     private DefaultMutableTreeNode addElementToParent(Object theChild) {
          return addElementToParent(defaultMutableTreeNode, theChild, true);
     private DefaultMutableTreeNode addElementToParent(DefaultMutableTreeNode theParent, Object theChild, boolean shouldBeVisible) {
          DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(theChild);
          if (theParent == null) {
               theParent = defaultMutableTreeNode;
          defaultTreeModel.insertNodeInto(childNode, theParent, theParent.getChildCount());
          TreePath childTreePath = new TreePath(childNode.getPath());
          //          Make sure the user can see the lovely new node.
          if (shouldBeVisible) {
               tree.scrollPathToVisible(childTreePath);
          tree.requestFocusInWindow();
          return childNode;
}this is the code which i was trying to execute.
here i want to explain you is
when i click the node the icon should change to open_icon
when i click the other node the previous node icon should change to close_icon
how is this possible
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