How to get total number of nodes in a JTree?

Question

Hi,
I am trying to get total number of nodes in a JTree, and cannot find a way to do it.
The current getRowCount() method returns the number of rows that are currently being displayed.
Is there a way to do this or I am missing something?
thanks,

Answer 1

How many nodes does this tree have?
import java.awt.EventQueue;
import javax.swing.*;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.*;
public class BigTree {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                TreeModel model = new TreeModel() {
                    private String node = "Node!";
                    @Override
                    public void valueForPathChanged(TreePath path,
                            Object newValue) {
                        // not mutable
                    @Override
                    public void removeTreeModelListener(TreeModelListener l) {
                        // not mutable
                    @Override
                    public boolean isLeaf(Object node) {
                        return false;
                    @Override
                    public Object getRoot() {
                        return node;
                    @Override
                    public int getIndexOfChild(Object parent, Object child) {
                        return child == node ? 0 : -1;
                    @Override
                    public int getChildCount(Object parent) {
                        return 1;
                    @Override
                    public Object getChild(Object parent, int index) {
                        return node;
                    @Override
                    public void addTreeModelListener(TreeModelListener l) {
                        // not mutable
                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.getContentPane().add(new JScrollPane(new JTree(model)));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
}But for bounded tree model using DefaultMutableTreeNode look at bread/depth/preorder enumeration methods to walk the entire tree. Or look at the source code for those and adapt them to work with the TreeModel interface.