## Uses of Interface
javax.swing.event.TreeExpansionListener

- Packages that use TreeExpansionListener
  Package | Description
  --- | ---
  javax.swing | Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
  javax.swing.plaf.basic | Provides user interface objects built according to the Basic look and feel.

- - ### Uses of TreeExpansionListener in javax.swing

    Classes in javax.swing that implement TreeExpansionListener
    Modifier and Type | Class | Description
    --- | --- | ---
    `protected class` | `JTree.AccessibleJTree` This class implements accessibility support for the `JTree` class.

    Methods in javax.swing that return TreeExpansionListener
    Modifier and Type | Method | Description
    --- | --- | ---
    `TreeExpansionListener[]` | JTree.`getTreeExpansionListeners()` Returns an array of all the `TreeExpansionListener`s added to this JTree with addTreeExpansionListener().

    Methods in javax.swing with parameters of type TreeExpansionListener
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | JTree.`addTreeExpansionListener(TreeExpansionListener tel)` Adds a listener for `TreeExpansion` events.
    `void` | JTree.`removeTreeExpansionListener(TreeExpansionListener tel)` Removes a listener for `TreeExpansion` events.

  - ### Uses of TreeExpansionListener in javax.swing.plaf.basic

    Classes in javax.swing.plaf.basic that implement TreeExpansionListener
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `BasicTreeUI.TreeExpansionHandler` Updates the TreeState in response to nodes expanding/collapsing.

    Methods in javax.swing.plaf.basic that return TreeExpansionListener
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected TreeExpansionListener` | BasicTreeUI.`createTreeExpansionListener()` Creates and returns the object responsible for updating the treestate when nodes expanded state changes.

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.