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## javax.swing.event
Interface TreeExpansionListener

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
`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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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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