Joda时间：如何在某个日期间隔获得平日的日期？ [英] Joda Time: How to get dates of weekdays on some date interval?

问题描述

我有两个本地日期代表一段时间间隔。现在我必须得到所有星期五的LocalDates，这个间隔包含。
最简单的方式来做？

解决方案

解决方案：懒洋洋一个个星期。

  import org.joda.time.LocalDate; 
 import java.util.Iterator; 
 
 public class DayOfWeekIterator实现Iterator< LocalDate> {
 private final LocalDate end; 
 private LocalDate nextDate; 
 
 public DayOfWeekIterator（LocalDate start，LocalDate end，int dayOfWeekToIterate）{
 this.end = end; 
 nextDate = start.withDayOfWeek（dayOfWeekToIterate）; 
 if（start.getDayOfWeek（）> dayOfWeekToIterate）{
 nextDate = nextDate.plusWeeks（1）; 
} 
} 
 
 public boolean hasNext（）{
 return！nextDate.isAfter（end）; 
} 
 
 public LocalDate next（）{
 LocalDate result = nextDate; 
 nextDate = nextDate.plusWeeks（1）; 
返回结果; 
} 
 
 public void remove（）{
 throw new UnsupportedOperationException（）; 
} 
} 
  

测试

  import org.joda.time.DateTimeConstants; 
 import org.joda.time.LocalDate; 
 
 public class DayOfWeekIteratorTest {
 
 public static void main（String [] args）{
 
 LocalDate startDate = new LocalDate（2010，12，1 ）; // 2010年12月1日
 LocalDate endDate = new LocalDate（2010，12，31）; // 2010年12月31日
 DayOfWeekIterator it = new DayOfWeekIterator（startDate，endDate，DateTimeConstants.FRIDAY）; 
 while（it.hasNext（））{
 System.out.println（it.next（））; 
} 
 
} 
} 
  

I have two LocalDates that represent some time interval. Now i have to get LocalDates of all fridays, that this interval contains. Easiest way to do it?

解决方案

Solution: lazily step by one week.

import org.joda.time.LocalDate;
import java.util.Iterator;

public class DayOfWeekIterator implements Iterator<LocalDate>{
    private final LocalDate end;
    private LocalDate nextDate;

    public DayOfWeekIterator(LocalDate start, LocalDate end, int dayOfWeekToIterate){
        this.end = end;
        nextDate = start.withDayOfWeek(dayOfWeekToIterate);
        if (start.getDayOfWeek() > dayOfWeekToIterate) {
            nextDate = nextDate.plusWeeks(1);
        }
    }

    public boolean hasNext() {
        return !nextDate.isAfter(end);
    }

    public LocalDate next() {
        LocalDate result = nextDate;
        nextDate = nextDate.plusWeeks(1);
        return result;
    }

    public void remove() {
        throw new UnsupportedOperationException();
    }
 }

Test

import org.joda.time.DateTimeConstants;
import org.joda.time.LocalDate;

public class DayOfWeekIteratorTest {

    public static void main(String[] args) {

        LocalDate startDate = new LocalDate(2010, 12, 1);//1st Dec 2010
        LocalDate endDate = new LocalDate(2010, 12, 31);//31st Dec 2010
        DayOfWeekIterator it = new DayOfWeekIterator(startDate, endDate, DateTimeConstants.FRIDAY);
        while (it.hasNext()) {
            System.out.println(it.next());
        }

    }
}

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