An Expandable JTree Problem

Question

Hi, I'm relatively new to creating JTree components, now I have looked at many examples, and this one is nearest (i can see) to how I want my Jtree to look, however it doesn't behave in a way which I would like!
Firstly, I can set the root node to have as many folders as i want, however they only mirror whats in the first root node, I dont want this - I want to be able to create about 5/6 different roots that will yield different results - I also want after each time you click on a folder, which will ask a question about a patient i.e. "Has the patient a head injury" - click on this then it should come up with "3" more different choices, so altogther want it about 5 deep.
However, this is what I've got so far - but like I say, its not yielding the results I want, does anyone know how to modify this or can anyone point me in the right direction by starting me off a bit, that would be great!
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class SelectableTree extends JFrame
                            implements TreeSelectionListener {
  public static void main(String[] args) {
    new SelectableTree();
  private JTree tree;
  private JTextField currentSelectionField;
  public SelectableTree() {
    super("Clinical Information Help System");
    WindowUtilities.setNativeLookAndFeel();
    addWindowListener(new ExitListener());
    Container content = getContentPane();
    DefaultMutableTreeNode root =
      new DefaultMutableTreeNode("Begin Clinical Questions");
    DefaultMutableTreeNode child = null;
    DefaultMutableTreeNode parent = null;
    DefaultMutableTreeNode grandChild = null;
    DefaultMutableTreeNode grandParent = null;
    DefaultMutableTreeNode child2 = null;
    DefaultMutableTreeNode parents = null;
    for(int grandParentIndex=1; grandParentIndex < 2; grandParentIndex++) {
      grandParent = new DefaultMutableTreeNode("[Does Patient Have Back Pains?] " + grandParentIndex);
      root.add(grandParent);
      for(int parentIndex =1; parentIndex < 3; parentIndex++) {
        parent = new DefaultMutableTreeNode("[Does the patient also have leg pain?] " + parentIndex +
                                     "." + parentIndex);
        grandParent.add(parent);
        for(int childIndex =1; childIndex < 3; childIndex++) {
         child = new DefaultMutableTreeNode("[are the pains in the lower back?] " + childIndex +
                                     "." + childIndex);
          parent.add(child);
          child2 = new DefaultMutableTreeNode("patient over 60?" + childIndex +
                "." + childIndex);
          child.add(child2);
        for(int grandChildIndex =1; grandChildIndex < 3; grandChildIndex++) {
           grandChild = new DefaultMutableTreeNode("[Does patient have bladder and/or bowel incontinence?] " + grandChildIndex +
                                        "." + grandChildIndex);
             child.add(grandChild);
        for(int childIndex = 1; childIndex < 3; childIndex++) {
            child = new DefaultMutableTreeNode("[Has Patient suffered either: appitite/wieght loss/fever?]" + childIndex +
                                         "." + childIndex);
            child = new DefaultMutableTreeNode("[Has pain been 4-6wks leg pain? OR 3-6mths low-back pain?]" + childIndex +
                    "." + childIndex);
              grandChild.add(child);
    tree = new JTree(root);
    //tree = new JTree(root2);
    tree.addTreeSelectionListener(this);
    content.add(new JScrollPane(tree), BorderLayout.CENTER);
    currentSelectionField = new JTextField("Current Selection: NONE");
    content.add(currentSelectionField, BorderLayout.SOUTH);
    setSize(400, 400);
    setVisible(true);
  public void valueChanged(TreeSelectionEvent event) {
    currentSelectionField.setText
      ("Current Selection: " +
       tree.getLastSelectedPathComponent().toString());
}

Answer 1

I'm not really sure what your problem is, for I don't see what you mean by "mirror". If it is you have but one root node, but wanted to have many instead, then you'd simply need to call setRootVisible(false); on the tree.
As a sidenote, I don't think it's a really good UI for what you're doing, but after all, I haven't got the whole picture.
Now, what is it you mean by: its not yielding the results I want ?