| Package | Description | 
|---|---|
| javax.swing.text | Provides classes and interfaces that deal with editable
and noneditable text components. | 
| javax.swing.undo | Allows developers to provide support for undo/redo
in applications such as text editors. | 
| Modifier and Type | Method and Description | 
|---|---|
| UndoableEditListener[] | AbstractDocument. getUndoableEditListeners()Returns an array of all the undoable edit listeners
 registered on this document. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | AbstractDocument. addUndoableEditListener(UndoableEditListener listener)Adds an undo listener for notification of any changes. | 
| void | Document. addUndoableEditListener(UndoableEditListener listener)Registers the given observer to begin receiving notifications
 when undoable edits are made to the document. | 
| void | AbstractDocument. removeUndoableEditListener(UndoableEditListener listener)Removes an undo listener. | 
| void | Document. removeUndoableEditListener(UndoableEditListener listener)Unregisters the given observer from the notification list
 so it will no longer receive updates. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | UndoManagerUndoManagermanages a list ofUndoableEdits,
 providing a way to undo or redo the appropriate edits. | 
| Modifier and Type | Field and Description | 
|---|---|
| protected Vector<UndoableEditListener> | UndoableEditSupport. listeners | 
| Modifier and Type | Method and Description | 
|---|---|
| UndoableEditListener[] | UndoableEditSupport. getUndoableEditListeners()Returns an array of all the  UndoableEditListeners added
 to this UndoableEditSupport with addUndoableEditListener(). | 
| Modifier and Type | Method and Description | 
|---|---|
| void | UndoableEditSupport. addUndoableEditListener(UndoableEditListener l)Registers an  UndoableEditListener. | 
| void | UndoableEditSupport. removeUndoableEditListener(UndoableEditListener l)Removes an  UndoableEditListener. | 
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