public TreeNode nextElement() {
try {
return stack.pop();
} catch (EmptyStackException e) {
throw new NoSuchElementException("No more elements");
}
}
public TreeNode nextElement() {
Enumeration enumer = stack.peek();
TreeNode node = (TreeNode) enumer.nextElement();
Enumeration children = node.children();
if (!enumer.hasMoreElements()) {
stack.pop();
}
if (children.hasMoreElements()) {
stack.push(children);
}
return node;
}
