private void updateCalendarLocale(Locale l) {
int oldFirstDayOfWeek = calendar.getFirstDayOfWeek();
setLocale(l);
calendarComponent.setLocale(l);
calendar = new GregorianCalendar(l);
int newFirstDayOfWeek = calendar.getFirstDayOfWeek();
// we are showing 1 week, and the first day of the week has changed
// update start and end dates so that the same week is showing
if (viewMode == Mode.WEEK && oldFirstDayOfWeek != newFirstDayOfWeek) {
calendar.setTime(calendarComponent.getStartDate());
calendar.add(java.util.Calendar.DAY_OF_WEEK, 2);
// starting at the beginning of the week
calendar.set(GregorianCalendar.DAY_OF_WEEK, newFirstDayOfWeek);
Date start = calendar.getTime();
// ending at the end of the week
calendar.add(GregorianCalendar.DATE, 6);
Date end = calendar.getTime();
calendarComponent.setStartDate(start);
calendarComponent.setEndDate(end);
// Week days depend on locale so this must be refreshed
setWeekendsHidden(hideWeekendsButton.getValue());
}
}
private void rollWeek(int direction) {
calendar.add(GregorianCalendar.WEEK_OF_YEAR, direction);
calendar.set(GregorianCalendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
resetCalendarTime(false);
resetTime(true);
calendar.add(GregorianCalendar.DATE, 6);
calendarComponent.setEndDate(calendar.getTime());
}
private void setWeekendsHidden(boolean weekendsHidden) {
if (weekendsHidden) {
int firstToShow = (GregorianCalendar.MONDAY - calendar.getFirstDayOfWeek()) % 7;
calendarComponent.setFirstVisibleDayOfWeek(firstToShow + 1);
calendarComponent.setLastVisibleDayOfWeek(firstToShow + 5);
} else {
calendarComponent.setFirstVisibleDayOfWeek(1);
calendarComponent.setLastVisibleDayOfWeek(7);
}
}
private void updateCalendarTimeZone(Object timezoneId) {
TimeZone tz = null;
if (!DEFAULT_ITEMID.equals(timezoneId)) {
tz = TimeZone.getTimeZone((String) timezoneId);
}
// remember the week that was showing, so we can re-set it later
Date startDate = calendarComponent.getStartDate();
calendar.setTime(startDate);
int weekNumber = calendar.get(java.util.Calendar.WEEK_OF_YEAR);
calendarComponent.setTimeZone(tz);
calendar.setTimeZone(calendarComponent.getTimeZone());
if (viewMode == Mode.WEEK) {
calendar.set(java.util.Calendar.WEEK_OF_YEAR, weekNumber);
calendar.set(java.util.Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
calendarComponent.setStartDate(calendar.getTime());
calendar.add(java.util.Calendar.DATE, 6);
calendarComponent.setEndDate(calendar.getTime());
}
}
public static void main(String[] args) {
// construct d as current date
GregorianCalendar d = new GregorianCalendar();
int today = d.get(Calendar.DAY_OF_MONTH);
int month = d.get(Calendar.MONTH);
int year = d.get(Calendar.YEAR);
System.out.println("\t" + month + "月\t" + year);
// set d to start date of the month
d.set(Calendar.DAY_OF_MONTH, 1);
int weekday = d.get(Calendar.DAY_OF_WEEK);
// get first day of week(Sunday in the U.S)
int firstDayOfWeek = d.getFirstDayOfWeek();
// determine the required indentation for the first line
int indent = 0;
while (weekday != firstDayOfWeek) {
indent++;
d.add(Calendar.DAY_OF_MONTH, -1);
weekday = d.get(Calendar.DAY_OF_WEEK);
}
// print weekday names
String[] weekdayNames = new DateFormatSymbols().getShortWeekdays();
do { // getShortWeekdays()方法生成的String型数组是以星期几(本质就是数值常量，星期日为1)
// 为索引，测试得到weekdayNames[0]为空
// 所以此循环可以直接用for each循环代替
System.out.printf("%4s", weekdayNames[weekday]);
d.add(Calendar.DAY_OF_MONTH, 1);
weekday = d.get(Calendar.DAY_OF_WEEK);
} while (weekday != firstDayOfWeek);
System.out.println();
for (int i = 1; i <= indent; i++) System.out.print(" ");
d.set(Calendar.DAY_OF_MONTH, 1);
do {
// print day
int day = d.get(Calendar.DAY_OF_MONTH);
System.out.printf("%3d", day);
// mark current day with *
if (day == today) System.out.print("*");
else System.out.print(" ");
// advance d to the next day
d.add(Calendar.DAY_OF_MONTH, 1);
weekday = d.get(Calendar.DAY_OF_WEEK);
// start a new line at the start of the week
if (weekday == firstDayOfWeek) System.out.println();
} while (d.get(Calendar.MONTH) == month);
// the loop exits when d is day 1 of the next month
// print final end of line if necessary
if (weekday != firstDayOfWeek) System.out.println();
}
