Java 8

Question

public class MyCalendar {

    GregorianCalendar greg = new GregorianCalendar();
    String[] month = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
    String[] day = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

    public void printMonth(int d, int m, int y) {
    GregorianCalendar greg= new GregorianCalendar(greg.get(Calendar.YEAR),
                greg.get(Calendar.MONTH), 1);

            System.out.println(month[greg.get(Calendar.MONTH)]);
            System.out.println(greg.get(Calendar.FRIDAY));
            System.out.println(greg.get(Calendar.SATURDAY));
    }

我无法弄清楚为什么greg.get（日历._____）给了我意想不到的价值。

YEAR, MONTH, DATE all give me correct values: 2015, 9, 6

FRIDAY returns 279

SATURDAY returns 3

SUNDAY returns 2015

TUESDAY returns 41

有人可以向我解释为什么我会得到这些数字吗？我试图找出该月的所有星期六的日期，并认为greg.get(Calendar.SATURDAY)可能对此有用。

Answer 1

因此，Calendar#get允许您获取Calendar对象的paritcular字段，例如DAY_OF_WEEK，然后可以通过{{1}将其映射回Calendar.MONDAY使得理解返回结果更简单。

因此，要计算一个月中Calendar.SUNDAY的数量，您需要先找到第一个SATURDAY（是的，我在设置{{{I}}之后尝试使用SATURDAY 1}}，但它给出了不一致的结果）

cal.set(Calendar.DAY_OF_WEEK, Calendar.SATUDAY)

然后直接计算7天，直到我们离开当月

DATE

Java 8

Calendar cal = Calendar.getInstance();
cal.set(Calendar.DATE, 1);

while (cal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY) {
    cal.add(Calendar.DATE, 1);
}

格里高利日历返回奇怪的值？

1 个答案:

Java 8