?? How can I update multiple JTrees GUI Simutaneously

Hi guys, thank you for viewing my thread. 

I have 2 JTree objects.(Tree1&Tree2). I wrote a JTree node selection listene
r which extends the MouseAdaptor to respond to mouse click in my first JTree
 object(Tree1). 

The listener works fine and can return me what I need, for example return me
 the node I clicked and some associated information which should be used to 
update my second tree(Tree2) correspondingly. These 2 trees locate in two se
parated splitPane in one GUI window. 

My idea is let the second tree(Tree2) be updated simutaneously upon the clic
king in my first JTree node(Tree1). 

My question is: How could I inform the second tree(Tree2) about my mouse eve
nt in the first tree? I mean how could I let Tree2's GUI update automaticall
y upon any event in Tree1? Should I use multithread for it, such as invokeLa
ter()? Is there any minimum solution for this? 

Is there any hints and examples? 
Thanks 
Michael