乔达时间：如何获取某个日期间隔的工作日日期？

Question

我有两个LocalDate，它们代表某个时间间隔。现在，我必须获取此间隔包含的所有星期五的LocalDates。最简单的方法吗？

Answer 1

解决方案：懒惰地走一个星期。

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();
    }
 }

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);//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());
        }

    }
}