在Java中如何查找前两个星期一的日期？

可能是这样的：

for(int i=0;i<15;i++){
Calendar cal = new GregorianCalendar();
cal.add(Calendar.DAY_OF_MONTH, -1);

if (cal.Calendar.DAY_OF_WEEK==1){
System.out.println(cal.cal.getTime())

但可能存在更简单的方法吗？

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谢谢。

你走对了方向

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, -7); // First week before
cal.add(Calendar.DAY_OF_YEAR, -7); // Second week before

让我在星期一做这件事

Calendar cal = Calendar.getInstance();

int weekday = cal.get(Calendar.DAY_OF_WEEK);
int days = (Calendar.SATURDAY - weekday + 2) % 7;

cal.add(Calendar.DAY_OF_YEAR, days);

cal.add(Calendar.DAY_OF_MONTH, -7);
cal.add(Calendar.DAY_OF_MONTH, -7);

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你在正确的轨道上

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, -7); // First week before
cal.add(Calendar.DAY_OF_YEAR, -7); // Second week before

让我在星期一做这件事

Calendar cal = Calendar.getInstance();

int weekday = cal.get(Calendar.DAY_OF_WEEK);
int days = (Calendar.SATURDAY - weekday + 2) % 7;

cal.add(Calendar.DAY_OF_YEAR, days);

cal.add(Calendar.DAY_OF_MONTH, -7);
cal.add(Calendar.DAY_OF_MONTH, -7);

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更简单的方法是直接设置工作日：

Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.add(Calendar.DATE, -7);
System.out.println(cal.getTime());

请记住，这不会影响时间。如果需要00:00，则需要设置适当的值：

cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);

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更简单的方法是直接设置工作日：

Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.add(Calendar.DATE, -7);
System.out.println(cal.getTime());

请记住，这不会影响时间。如果需要00:00，则需要设置适当的值：

cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);

java.time 使用临时调节器

LocalDate today = LocalDate.now();

LocalDate previousOrSameMonday = today.with( TemporalAdjusters.previousOrSame( DayOfWeek.MONDAY ) );

减去一周，得到第二个

LocalDate secondMondayBefore = previousOrSameMonday.minusWeeks( 1 );

java.time 使用临时调节器

LocalDate today = LocalDate.now();

LocalDate previousOrSameMonday = today.with( TemporalAdjusters.previousOrSame( DayOfWeek.MONDAY ) );

减去一周，得到第二个

LocalDate secondMondayBefore = previousOrSameMonday.minusWeeks( 1 );

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这没有必要把星期一作为结果吗？这没有必要把星期一作为结果吗？