Java Utililty Methods JTextComponent Action

Action getAction(JTextComponent component, String actionName)
Search the given text component's list of actions for an action with the given name.

for (Action a : component.getActions()) {
 if (actionName.equals(a.getValue(Action.NAME))) {
 return a;
return null;

T getAction(JTextComponent target, Class aClass)
Searches all actions of a JTextComponent for ab action of the given class and returns the first one that matches that class, or null if no Action is found

for (Object k : target.getActionMap().allKeys()) {
 Action a = target.getActionMap().get(k);
 if (aClass.isInstance(a)) {
 @SuppressWarnings("unchecked")
 T t = (T) a;
 return t;
return null;

void setHistoryActions(JTextComponent textComponent)
set History Actions

Document doc = textComponent.getDocument();
UndoManager undo = new UndoManager();
doc.addUndoableEditListener(new UndoableEditListener() {
 @Override
 public void undoableEditHappened(UndoableEditEvent evt) {
 undo.addEdit(evt.getEdit());
});
...