关...于...日...期 难道没人知道吗? 如何获得某年某周的起始日期和结束日期

Question

private Date getStartDate(int year, int weekNo);
private Date getEndDate(int year, int weekNo);有做过的朋友能帮我一下吗?

Answer 1

private Date getStartDate(int year, int weekNo) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.WEEK_OF_YEAR, weekNo);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return cal.getTime();
    }

Answer 2

import java.util.*;public class YearWeek1 { /**
 * @param args
 */
public static void main(String[] args) {
YearWeek1 yw = new YearWeek1();
Date d = yw.getStartDate(2006, 1);
}

private Date getStartDate(int year, int weekNo)
{
Calendar c = Calendar.getInstance();
c.clear();
c.set(Calendar.YEAR, year);
c.set(Calendar.WEEK_OF_YEAR, weekNo);
return c.getTime();
}
}另一个方法没有必要，Date d2 = yw.getStartDate(2006, 1+1); 就可以了。

Answer 3

private Date getStartDate(int year, int weekNo)
{
Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.WEEK_OF_YEAR, weekNo);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return cal.getTime(); }
private Date getEndDate(int year, int weekNo)
{
Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.WEEK_OF_YEAR, weekNo+1);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        return cal.getTime(); }
以星期一为第一天