🚀 go-pugleaf

hi ,
i'm using the JTree and its necessary for me that 
i can set the focus of the treenode by a method of my
class.
JTree offers the method jTree.setSelectionPath(TreePath path);
With path.toString() i get a String like this:
"[root, first_child, second_child]" of the selected path.
How could i manage it to set the node as focused node if i have the
path wich i want to select by code just as a string like :
"[root, first_child";

I tried it with Object gh = "[root, firstchild]";
		TreePath tp = (TreePath) gh;
		jTree.setSelectionPath(tp);
but get a casting error-exception.

Thanks for any solutions.

Ciao Thomas