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How to make the whole tree expanded?

 
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Hi,
I have a JTree on my GUI, for some reason, each time when a new node added / deleted to/from the tree, I want the whole tree been expanded, that means all nodes in the tree are visible.
I found a method
public void scrollPathToVisible(TreePath path)
in class JTree, but this method only expand one path, all the others are collasped.
Is there any method can expand the whole tree?
Thanks!
 
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Give this a try:
 
Don't get me started about those stupid light bulbs.
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