在Java中获取日期范围中的所有星期五

使用出色的http://www.joda.org/joda-time/库，这是一种更简单的方法：

String start = "01/01/2009";String end = "12/09/2013";DateTimeFormatter pattern = DateTimeFormat.forPattern("dd/MM/yyyy");DateTime startDate = pattern.parseDateTime(start);DateTime endDate = pattern.parseDateTime(end);List<DateTime> fridays = new ArrayList<>();while (startDate.isBefore(endDate)){    if ( startDate.getDayOfWeek() == DateTimeConstants.FRIDAY ){        fridays.add(startDate);    }    startDate = startDate.plusDays(1);}

最后，您将在星期五数组中包含星期五。简单？

或者，如果您想加快进度，在遇到星期五后，可以从使用几天切换到使用几周：

String start = "01/01/2009";String end = "12/09/2013";DateTimeFormatter pattern = DateTimeFormat.forPattern("dd/MM/yyyy");DateTime startDate = pattern.parseDateTime(start);DateTime endDate = pattern.parseDateTime(end);List<DateTime> fridays = new ArrayList<>();boolean reachedAFriday = false;while (startDate.isBefore(endDate)){    if ( startDate.getDayOfWeek() == DateTimeConstants.FRIDAY ){        fridays.add(startDate);        reachedAFriday = true;    }    if ( reachedAFriday ){        startDate = startDate.plusWeeks(1);    } else {        startDate = startDate.plusDays(1);    }}