public class Test {
public static void main(String[] args) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(format.parse("2010年12月25日"));
calendar.add(Calendar.DAY_OF_YEAR, 1);
Date date = calendar.getTime();
System.out.println(date);
}
}