// The path to the documents directory.
String dataDir = Utils.getDataDir(AddRemoveCalendarExceptions.class);

Project project = new Project(dataDir + "input.mpp");

//Remove an exception
Calendar cal = project.getCalendars().toList().get(0);
if (cal.getExceptions().size() > 1)
{
        CalendarException exc = cal.getExceptions().toList().get(0);
        cal.getExceptions().remove(exc);
}

//Add an exception
CalendarException calExc = new CalendarException();

java.util.Calendar calObject = java.util.Calendar.getInstance();
calObject.set(2009, 1, 1, 0, 0, 0);
calExc.setFromDate(calObject.getTime());

calObject.set(2009, 1, 3, 0, 0, 0);
calExc.setToDate(calObject.getTime());

cal.getExceptions().add(calExc);

//Display exceptions
for(CalendarException calExc1:cal.getExceptions())
{
    System.out.println("From" + calExc1.getFromDate().toString());
    System.out.println("To" + calExc1.getToDate().toString());
}