| 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.event | Provides for events fired by Swing components. | 
| javax.swing.plaf.basic | Provides user interface objects built according to the
Basic look and feel. | 
| javax.swing.tree | Provides classes and interfaces for dealing with
 javax.swing.JTree. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | JTree.AccessibleJTree. treeCollapsed(TreeExpansionEvent e)Tree Collapsed notification. | 
| void | JTree.AccessibleJTree. treeExpanded(TreeExpansionEvent e)Tree Model Expansion notification. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | TreeExpansionListener. treeCollapsed(TreeExpansionEvent event)Called whenever an item in the tree has been collapsed. | 
| void | TreeExpansionListener. treeExpanded(TreeExpansionEvent event)Called whenever an item in the tree has been expanded. | 
| void | TreeWillExpandListener. treeWillCollapse(TreeExpansionEvent event)Invoked whenever a node in the tree is about to be collapsed. | 
| void | TreeWillExpandListener. treeWillExpand(TreeExpansionEvent event)Invoked whenever a node in the tree is about to be expanded. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | BasicTreeUI.TreeExpansionHandler. treeCollapsed(TreeExpansionEvent event)Called whenever an item in the tree has been collapsed. | 
| void | BasicTreeUI.TreeExpansionHandler. treeExpanded(TreeExpansionEvent event)Called whenever an item in the tree has been expanded. | 
| Modifier and Type | Field and Description | 
|---|---|
| protected TreeExpansionEvent | ExpandVetoException. eventThe event that the exception was created for. | 
| Constructor and Description | 
|---|
| ExpandVetoException(TreeExpansionEvent event)Constructs an ExpandVetoException object with no message. | 
| ExpandVetoException(TreeExpansionEvent event,
                   String message)Constructs an ExpandVetoException object with the specified message. | 
 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, 2025, Oracle and/or its affiliates.  All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.