void InitUndoMgr() { final UndoManager undo = new UndoManager(); Document doc = txt_box.getDocument(); // Listen for undo and redo events doc.addUndoableEditListener( new UndoableEditListener() { public void undoableEditHappened(UndoableEditEvent evt) { undo.addEdit(evt.getEdit()); } }); // Create an undo action and add it to the text component txt_box .getActionMap() .put( "Undo", new AbstractAction("Undo") { public void actionPerformed(ActionEvent evt) { try { if (undo.canUndo()) { undo.undo(); } } catch (CannotUndoException e) { } } }); // Bind the undo action to ctl-Z txt_box.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo"); // Create a redo action and add it to the text component txt_box .getActionMap() .put( "Redo", new AbstractAction("Redo") { public void actionPerformed(ActionEvent evt) { try { if (undo.canRedo()) { undo.redo(); } } catch (CannotRedoException e) { } } }); // Bind the redo action to ctl-Y txt_box.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo"); }