java 获取某个特定时间的函数

public static boolean isBonusTime()
 {
  Date date = new Date();
  String week = getWeekOfDate(date);
  if ("星期日".equals(week) || "星期二".equals(week) || "星期四".equals(week))
  {
   Calendar ca = Calendar.getInstance();
   //int hour = ca.get(Calendar.HOUR);//12小时制
   int hour = ca.get(Calendar.HOUR_OF_DAY);//24小时制
   if (hour >= 21)
   {
    return true;
   }
  }
  return false;

 }

 /**
  * 获取当前日期是星期几<br>
  * @param date
  * @return 当前日期是星期几
  */
 public static String getWeekOfDate(Date date)
 {
  String[] weekDays =
  { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);

  int week = cal.get(Calendar.DAY_OF_WEEK) - 1;
  if (week < 0)
  {
   week = 0;
  }

  return weekDays[week];
 }

public static boolean isBonusTime()
 {
  Date date = new Date();
  String week = getWeekOfDate(date);
  if ("星期日".equals(week) || "星期二".equals(week) || "星期四".equals(week))
  {
   Calendar ca = Calendar.getInstance();
   //int hour = ca.get(Calendar.HOUR);//12小时制
   int hour = ca.get(Calendar.HOUR_OF_DAY);//24小时制
   if (hour >= 21)
   {
    return true;
   }
  }
  return false;

 }

 /**
  * 获取当前日期是星期几<br>
  * @param date
  * @return 当前日期是星期几
  */
 public static String getWeekOfDate(Date date)
 {
  String[] weekDays =
  { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);

  int week = cal.get(Calendar.DAY_OF_WEEK) - 1;
  if (week < 0)
  {
   week = 0;
  }

  return weekDays[week];
 }