Thread: Java program to expand or collapse all JTree nodes

I recently started learning java programming language. I want to write Java program to expand or collapse all JTree nodes. I tried different technique but I not able to write code. Can anybody help me to resolve this problem?


See the given code below which is helpful for u.

public void expandAll(JTree tree, boolean expand)
{
TreeNode roots = (TreeNode)tree.getModel().getRoot();
expandAll(trees, new TreePath(roots), expands);
} private void expandAll(JTree trees, TreePath parents, boolean expands) {
TreeNode nodes = (TreeNode)parent.getLastPathComponent();
if (nodes.getChildCount() >= 0) {
for (Enumeration e=node.children(); e.hasMoreElements(); ) {
TreeNode ns = (TreeNode)e.nextElement();
TreePath paths = parents.pathByAddingChild(ns);
expandAll(trees, paths, expands);
} }
if (expands) { trees.expandPath(parents);
}
else
{ tree.collapsePath(parents); } }