Calendar获取三天前的日期

开发环境 jdk 1.8

 @Test
 public void testTime() throws ParseException {
 SimpleDateFormat sj = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.add(Calendar.DATE, -3);
        System.out.println(sj.format(calendar.getTime()));
 }

控制台打印如下