Java Utililty Methods JTree Node

List of utility methods to do JTree Node

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Description

The list of methods to do JTree Node are organized into topic(s).

Method

ListgetAllTreeNodes(TreeModel model, int startLevel, Class clazz, DefaultMutableTreeNode root)
Get a flat list of all the treeNodes at or below a certain level, where the userObject is of a certain class, starting from a particular root, or the topmost treeNode if root is null. 
List nodesResult = new ArrayList();
if (root == null) {
    root = (DefaultMutableTreeNode) model.getRoot();
treeNodeLevel = 0;
return getAllTreeNodes(model, root, nodesResult, startLevel, clazz);
voidgetAllUserObject(TreeNode node, Set userObjectSet)
get All User Object 
for (int i = 0; i < node.getChildCount(); i++) {
    DefaultMutableTreeNode childNode = (DefaultMutableTreeNode) node.getChildAt(i);
    userObjectSet.add(childNode.getUserObject());
    getAllUserObject(childNode, userObjectSet);
intgetLevel(TreeNode treeNode)
get Level 
int count = -1;
TreeNode current = treeNode;
do {
    current = current.getParent();
    count++;
} while (current != null);
return count;
DefaultMutableTreeNode[]getMutableTreeNodes(TreeNode[] path)
get Mutable Tree Nodes 
if (path == null)
    return null;
DefaultMutableTreeNode[] nodes = new DefaultMutableTreeNode[path.length];
for (int i = 0; path != null && i < path.length; i++) {
    nodes[i] = (DefaultMutableTreeNode) path[i];
return nodes;
ObjectgetNodeAt(final JTree tree, final int x, final int y)
Finds the node at a given mouse cursor position. 
final TreePath selPath = tree.getPathForLocation(x, y);
return selPath != null ? selPath.getLastPathComponent() : null;
DefaultMutableTreeNodegetNodeForEvent(JTree targetTree, DropTargetDragEvent dtde)
Restiuisce il nodo target 
Point p = dtde.getLocation();
TreePath path = targetTree.getClosestPathForLocation(p.x, p.y);
return (DefaultMutableTreeNode) path.getLastPathComponent();
StringgetPathStringForNode(DefaultMutableTreeNode node)
get Path String For Node 
StringBuilder sb = new StringBuilder();
Object[] path = node.getUserObjectPath();
for (int i = 0; i < path.length; i++) {
    sb.append("/@").append(((String) path[i]));
return sb.toString();
TreeNodegetSubTree(TreeNode root, String name)
find a subtree in the root node and return it, based on exact match. 
if (("" + root).equals(name))
    return root;
TreeNode node = null;
for (int i = 0; i < root.getChildCount(); i++) {
    node = getSubTree(root.getChildAt(i), name);
    if (node != null)
        break;
return node;
booleanhasOnlyLeafs(JTree tree, Object node)
has Only Leafs 
TreeModel model = tree.getModel();
for (int i = 0; i < model.getChildCount(node); i++) {
    if (!model.isLeaf(model.getChild(node, i))) {
        return false;
return true;
HashtableinitializeExpandedPathsBeforeChange(JTree tree, DefaultMutableTreeNode root)
Call this before a JTree changes. 
Enumeration paths = tree.getExpandedDescendants(new TreePath(root.getPath()));
Hashtable expandedPaths = new Hashtable();
if (paths != null) {
    while (paths.hasMoreElements()) {
        TreePath treePath = (TreePath) paths.nextElement();
        expandedPaths.put(treePath.toString(), Boolean.TRUE);
return expandedPaths;