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Create a change listener and register with the menu selection manager

import javax.swing.MenuElement; import javax.swing.MenuSelectionManager; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class Main {   public static void main(String[] argv) throws Exception {     MenuSelectionManager.defaultManager().addChangeListener(         new ChangeListener() {           public void stateChanged(ChangeEvent evt) {             MenuSelectionManager msm = (MenuSelectionManager) evt.getSource();             MenuElement[] path = msm.getSelectedPath();             if (path.length == 0) {             }           }         });   } }