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## javax.swing.event
Interface TreeExpansionListener

All Superinterfaces:
  EventListener

All Known Implementing Classes:
  JTree.AccessibleJTree, BasicTreeUI.TreeExpansionHandler

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

    public void treeExpanded(TreeExpansionEvent event)

  Called whenever an item in the tree has been expanded.

### treeCollapsed

    public void treeCollapsed(TreeExpansionEvent event)

  Called whenever an item in the tree has been collapsed.

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