import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textcomp = new JTextArea();
final UndoManager undo = new UndoManager();
Document doc = textcomp.getDocument();
doc.addUndoableEditListener(new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undo.addEdit(evt.getEdit());
}
});
textcomp.getActionMap().put("Undo", new AbstractAction("Undo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canUndo()) {
undo.undo();
}
} catch (CannotUndoException e) {
}
}
});
textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
textcomp.getActionMap().put("Redo", new AbstractAction("Redo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canRedo()) {
undo.redo();
}
} catch (CannotRedoException e) {
}
}
});
textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
}
}