使用 Java 8 更新的答案

使用Java 8并保持与以前相同的原则（一周的第一天取决于您），您应该考虑使用以下方法：Locale

获取特定属性的第一个和最后一个DayOfWeekLocale

final DayOfWeek firstDayOfWeek = WeekFields.of(locale).getFirstDayOfWeek();
final DayOfWeek lastDayOfWeek = DayOfWeek.of(((firstDayOfWeek.getValue() + 5) % DayOfWeek.values().length) + 1);

查询本周的第一天和最后一天

LocalDate.now(/* tz */).with(TemporalAdjusters.previousOrSame(firstDayOfWeek)); // first day
LocalDate.now(/* tz */).with(TemporalAdjusters.nextOrSame(lastDayOfWeek));      // last day

示范

请考虑以下事项：class

private static class ThisLocalizedWeek {

    // Try and always specify the time zone you're working with
    private final static ZoneId TZ = ZoneId.of("Pacific/Auckland");

    private final Locale locale;
    private final DayOfWeek firstDayOfWeek;
    private final DayOfWeek lastDayOfWeek;

    public ThisLocalizedWeek(final Locale locale) {
        this.locale = locale;
        this.firstDayOfWeek = WeekFields.of(locale).getFirstDayOfWeek();
        this.lastDayOfWeek = DayOfWeek.of(((this.firstDayOfWeek.getValue() + 5) % DayOfWeek.values().length) + 1);
    }

    public LocalDate getFirstDay() {
        return LocalDate.now(TZ).with(TemporalAdjusters.previousOrSame(this.firstDayOfWeek));
    }

    public LocalDate getLastDay() {
        return LocalDate.now(TZ).with(TemporalAdjusters.nextOrSame(this.lastDayOfWeek));
    }

    @Override
    public String toString() {
        return String.format(   "The %s week starts on %s and ends on %s",
                                this.locale.getDisplayName(),
                                this.firstDayOfWeek,
                                this.lastDayOfWeek);
    }
}

我们可以按如下方式演示它的用法：

final ThisLocalizedWeek usWeek = new ThisLocalizedWeek(Locale.US);
System.out.println(usWeek);
// The English (United States) week starts on SUNDAY and ends on SATURDAY
System.out.println(usWeek.getFirstDay()); // 2018-01-14
System.out.println(usWeek.getLastDay());  // 2018-01-20

final ThisLocalizedWeek frenchWeek = new ThisLocalizedWeek(Locale.FRANCE);
System.out.println(frenchWeek);
// The French (France) week starts on MONDAY and ends on SUNDAY
System.out.println(frenchWeek.getFirstDay()); // 2018-01-15
System.out.println(frenchWeek.getLastDay());  // 2018-01-21

原始 Java 7 答案（已过时）

只需使用：

c.setFirstDayOfWeek(Calendar.MONDAY);

解释：

现在，您一周的第一天已设置为 。此设置取决于您的 .Calendar.SUNDAYLocale

因此，更好的替代方法是初始化您感兴趣的指定。
例如：CalendarLocale

Calendar c = GregorianCalendar.getInstance(Locale.US);

...将为您提供当前输出，同时：

Calendar c = GregorianCalendar.getInstance(Locale.FRANCE);

...会给你你预期的输出。

好吧，看起来你得到了答案。这是一个附加组件，在Java 8及更高版本中使用java.time。（请参阅教程)

import java.time.DayOfWeek;
import java.time.LocalDate;

public class MondaySunday
{
  public static void main(String[] args)
  {
    LocalDate today = LocalDate.now();

    // Go backward to get Monday
    LocalDate monday = today;
    while (monday.getDayOfWeek() != DayOfWeek.MONDAY)
    {
      monday = monday.minusDays(1);
    }

    // Go forward to get Sunday
    LocalDate sunday = today;
    while (sunday.getDayOfWeek() != DayOfWeek.SUNDAY)
    {
      sunday = sunday.plusDays(1);
    }

    System.out.println("Today: " + today);
    System.out.println("Monday of the Week: " + monday);
    System.out.println("Sunday of the Week: " + sunday);
  }
}

另一种方法是使用时间调节器。

import java.time.LocalDate;

import static java.time.DayOfWeek.MONDAY;
import static java.time.DayOfWeek.SUNDAY;
import static java.time.temporal.TemporalAdjusters.nextOrSame;
import static java.time.temporal.TemporalAdjusters.previousOrSame;

public class MondaySunday
{
  public static void main(String[] args)
  {
    LocalDate today = LocalDate.now();

    LocalDate monday = today.with(previousOrSame(MONDAY));
    LocalDate sunday = today.with(nextOrSame(SUNDAY));

    System.out.println("Today: " + today);
    System.out.println("Monday of the Week: " + monday);
    System.out.println("Sunday of the Week: " + sunday);
  }
}