JTree last selected path component is giving null

[Nageswar Kakolla]

Hi there,

I am trying to access determine selected node in JTree to delete tree node and i am using

JTree tree = new JTree();

tree.getLastSelectedPathComponent() is seleted node but somehow this is giving null value and i checked tree.getMaxRowCount is 1 meaning i have only two levels in Tree.
Root node and rest of them are childrens

Does anybody throw somelight on this ?

Root
|--child1
|-- child2
|-- child3

etc
above is my tree structure.
i know the logic for deleting of tree node based on selected node

Thanx for help

[Sam Codean]

Can you send me the code snippet. I may be able to help.
Could you also elaborate as to what are you trying to do?
JTree tree = new JTree(); would create only a sample tree and not the kind you require, hope you are not doing something wrong there
[ March 08, 2006: Message edited by: Sam Codean ]

[Craig Wood]

This seems to work okay. Maybe you can modify it to demonstrate the null values.

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
 
public class TreeTest implements TreeSelectionListener
{
    JTree tree;
 
    public void valueChanged(TreeSelectionEvent e)
    {
        TreePath path = e.getNewLeadSelectionPath();
        Object lspc = tree.getLastSelectedPathComponent();
        System.out.println("path = " + path + "\n" +
                           "lspc = " + lspc);
    }
 
    private void expandTree()
    {
        DefaultMutableTreeNode root = (DefaultMutableTreeNode)tree.getModel().getRoot();
        java.util.Enumeration e = root.breadthFirstEnumeration();
        while(e.hasMoreElements())
        {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode)e.nextElement();
            if(node.isLeaf()) break;
            int row = tree.getRowForPath(new TreePath(node.getPath()));
            tree.expandRow(row);
        }
    }
 
    private JTree getTree()
    {
        tree = new JTree();
        tree.addTreeSelectionListener(this);
        expandTree();
        return tree;
    }
 
    public static void main(String[] args)
    {
        TreeTest test = new TreeTest();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(test.getTree()));
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}