怎样用java获得想要的日期？

这是真实的人问的吗？

public class DateStuff {

    public static void main(String[] args) {
        /*1. Date */
        Date date = new Date(2015 - 1900,0,1);
        System.out.println(date); //Thu Jan 01 00:00:00 CST 2015
        date.setMonth(date.getMonth() + 9);
        System.out.println(date); //Thu Oct 01 00:00:00 CST 2015

        /*2. Calendar */
        Calendar calendar = Calendar.getInstance();
        calendar.set(2015, 0, 1, 0, 0, 0);
        System.out.println(calendar.getTime()); //Thu Jan 01 00:00:00 CST 2015
        calendar.add(Calendar.MONTH, 9);
        System.out.println(calendar.getTime()); //Thu Oct 01 00:00:00 CST 2015
    }
}