TreeExpansionListener (Java SE 8 & JDK 8 API)

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All Superinterfaces:

EventListener

All Known Implementing Classes:

BasicTreeUI.TreeExpansionHandler, JTree.AccessibleJTree
```
public interface TreeExpansionListener
extends EventListener
```
The listener that's notified when a tree expands or collapses a node. For further documentation and examples see How to Write a Tree Expansion Listener, a section in The Java Tutorial.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`treeCollapsed(TreeExpansionEvent event)` Called whenever an item in the tree has been collapsed.
`void`	`treeExpanded(TreeExpansionEvent event)` Called whenever an item in the tree has been expanded.

- Method Detail
  - treeExpanded
```
void treeExpanded(TreeExpansionEvent event)
```
    Called whenever an item in the tree has been expanded.
  - treeCollapsed
```
void treeCollapsed(TreeExpansionEvent event)
```
    Called whenever an item in the tree has been collapsed.

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