Java Reference
In-Depth Information
The
clear
method can be used to reset a field's value to be unspecified.
You can use
clear
with no parameters to clear all calendar fields. The
isSet
method returns
true
if a field currently has a value set.
Three variants of
set
change particular fields you commonly need to ma-
nipulate, leaving unspecified fields alone:
public void
set(int year, int month, int date)
public void
set(int year, int month, int date, int hrs, int
min)
public void
set(int year, int month, int date, int hrs, int
min, int sec)
You can also use
setTime
to set the calendar's time from a
Date
object.
A calendar field that is out of range can be interpreted correctly. For ex-
ample, January 32 can be equivalent to February 1. Whether it is treated
as such or as an error depends on whether the calendar is considered
to be
lenient.
A lenient calendar will do its best to interpret values as
valid. A strict (non-lenient) calendar will not accept any values out of
range, throwing
IllegalArgumentException
. The
setLenient
method takes
a
boolean
that specifies whether parsing should be lenient;
isLenient
re-
turns the current setting.
A week can start on any day, depending on the calendar. You can dis-
cover the first day of the week with the method
getFirstDayOfWeek
. In
a Gregorian calendar for the United States this method would return
SUNDAY
, whereas Ireland uses
MONDAY
. You can change this by invoking
setFirstDayOfWeek
with a valid weekday index.
Some calendars require a minimum number of days in the first week
of the year. The method
getMinimalDaysInFirstWeek
returns that number;
the method
setMinimalDaysInFirstWeek
lets you change it. The minimum
number of days in a week is important when you are trying to determine
in which week a particular date fallsfor example, in some calendars, if
January 1 is a Friday it may be considered part of the last week of the
preceding year.
