Save JTree Tree Node State

The JTree class does not have a means to save a tree node’s state (e.g. expanded of collapsed). I did come across a forum where a post mentioned about the use of a TreeExpansionListener to save a tree node’s state and provided a short sample snippet. I modified some minor bugs and the code below is the finished and modified code.

Say you want to add a new tree node, you do not want the JTree to refresh all its tree nodes’ expanded state to collapsed. Rather, the previous state will still be the same even when a new tree node is added to the JTree. You can call the method jTree1.restoreExpansionState() to restore it and jTree1.resetExpansionState() to reset all the state to collapsed.

Related Posts Plugin for WordPress, Blogger...

2 comments

Leave a Reply

Your email address will not be published. Required fields are marked *