知道某个日期计算第二天的日期

<%@ page import="java.util.Date,java.text.*"%>

String dateStr="2007/11/30 08:00:00";
 Date  tempDate0=new Date(dateStr);
 long a= tempDate0.parse(dateStr);
 long tomorrow = a + 3600000 * 24;
 
 out.println(tomorrow);
 
 java.util.Date tomorrowime = new java.util.Date(tomorrow);
 SimpleDateFormat formatterehour = new SimpleDateFormat(
   "yyyy-MM-dd 08:00:00");
 
 String tomorrowdate = formatterehour.format(tomorrowime);
 out.println(tomorrowdate);
 
 String date= tomorrowdate.substring(0, 19);