public class test{    public static void main(String[] args) {                      Date randomDate = randomDate("2012-06-01", "2012-12-12");            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");            System.out.println(randomDate。toString());    }     private static Date randomDate(String beginDate, String endDate) {        try {            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");            Date start = format.parse(beginDate);// 开始日期            Date end = format.parse(endDate);// 结束日期            if (start.getTime() >= end.getTime()) {                return null;            }            long date = random(start.getTime(), end.getTime());             return new Date(date);        } catch (Exception e) {            e.printStackTrace();        }        return null;    }     private static long random(long begin, long end) {        long rtnn = begin + (long) (Math.random() * (end - begin));        if (rtnn == begin || rtnn == end) {            return random(begin, end);        }        return rtnn;    }}