Joda-Time: How to get the day from a particular date in a year?

Question

I have a list of holidays in a year. I need the following things.

1. I need to get all the dates in a year. Then I need to remove all the holidays and get the remaining dates. Something like:

   Get dates (all dates in a year)

   Get holiday dates (I already have them stored in a database)

   Get dates - holiday dates

2. Against a particular date, I need to know what day it is (Monday? Tuesday? What day?)

QUESTION:-

Using the Joda-Time library, please share the simplest way of getting it done.

Answer 1

回答第一个问题:

public static List<LocalDate> getDaysOfYear(int year, List<LocalDate> holidays) {

  LocalDate date = new LocalDate(year, 1, 1);
  LocalDate end = new LocalDate(year + 1, 1, 1);
  List<LocalDate> list = new ArrayList<LocalDate>();

  while (date.isBefore(end)) {
    if (!holidays.contains(date)) {
      list.add(date);
    }
    date = date.plusDays(1);
  }

  return Collections.unmodifiableList(list);
}

回答第二个问题:

LocalDate date = LocalDate.now();
int dow = date.getDayOfWeek();
// dow has the values 1=Monday, 2=Tuesday, ..., 7=Sunday

问题2的更新:

使用数字(或命名常量,如DateTimeConstants.MONDAY,最后也只是数字)的替代方法是使用属性dayOfWeek().getAsText().它允许访问本地化名称,如"Monday"(英语)或"Lundi"(法语).

看到这个代码示例:

LocalDate date = LocalDate.now();
String nameOfWeekday = date.dayOfWeek().getAsText(Locale.ENGLISH);

对于此类仅限日期的问题,该类型LocalDate是迄今为止最简单和直接使用的类型.DateTime如果您有时间部分并且需要时区计算,那么这种类型才有意义.