Expand Collapse Expand Issue with JTree Lazy loading

Question

I have implemented a tree using Lazy Loading. The 1st level nodes are created at the time of tree creation, where as the child nodes are created only when a user expands any

Answer 1

Once a node has populated, simple don't repopulate it. On treeExpanded, simply check to see of the parent node has any children, if it does, don't reload anything.

You will need to supply the ability to refresh a parent node. I normally do this with a JPopupMenu.