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java.util
Class Calendar

java.lang.Objectjava.util.Calendar
- All Implemented Interfaces:
- java.lang.Cloneable, java.io.Serializable
- Direct Known Subclasses:
- GregorianCalendar
- public abstract class Calendar
- extends java.lang.Object
- implements java.io.Serializable, java.lang.Cloneable
- extends java.lang.Object
This class is an abstract base class for Calendars, which can be
used to convert between Date objects and a set of
integer fields which represent YEAR,
MONTH, DAY, etc. The Date
object represents a time in milliseconds since the Epoch.
This class is locale sensitive. To get the Object matching the
current locale you can use getInstance. You can even provide
a locale or a timezone. getInstance returns currently
a GregorianCalendar for the current date.
If you want to convert a date from the Year, Month, Day, DayOfWeek,
etc. Representation to a Date-Object, you can create
a new Calendar with getInstance(),
clear() all fields, set(int,int) the
fields you need and convert it with getTime().
If you want to convert a Date-object to the Calendar
representation, create a new Calendar, assign the
Date-Object with setTime(), and read the
fields with get(int).
When computing the date from time fields, it may happen, that there
are either two few fields set, or some fields are inconsistent. This
cases will handled in a calendar specific way. Missing fields are
replaced by the fields of the epoch: 1970 January 1 00:00.
To understand, how the day of year is computed out of the fields
look at the following table. It is traversed from top to bottom,
and for the first line all fields are set, that line is used to
compute the day.
month + day_of_month month + week_of_month + day_of_week month + day_of_week_of_month + day_of_week day_of_year day_of_week + week_of_yearThe hour_of_day-field takes precedence over the ampm and hour_of_ampm fields.
Note: This can differ for non-Gregorian calendar.
To convert a calendar to a human readable form and vice versa, use the
java.text.DateFormat class. Other useful things you can do with an calendar, is
rolling fields (that means increase/decrease a
specific field by one, propagating overflows), or
adding/substracting a fixed amount to a field.
| Field Summary | |
static int |
AM
Useful constant for 12-hour clock. |
static int |
AM_PM
Constant representing the part of the day for 12-hour clock. |
static int |
APRIL
Constant representing April. |
protected boolean |
areFieldsSet
Tells if the fields have a valid value. |
static int |
AUGUST
Constant representing August. |
private static java.lang.String |
bundleName
The name of the resource bundle. |
private static HashMap |
cache
Cache of locale->calendar-class mappings. |
private static java.lang.String |
calendarClassName
This is the default calendar class, that is returned on java.util.Calendar.getInstance(). |
private static java.lang.Class[] |
ctorArgTypes
Preset argument types for calendar-class constructor lookup. |
static int |
DATE
Constant representing the day time field, synonym for DAY_OF_MONTH. |
static int |
DAY_OF_MONTH
Constant representing the day time field. |
static int |
DAY_OF_WEEK
Constant representing the day of week time field. |
static int |
DAY_OF_WEEK_IN_MONTH
Constant representing the day-of-week-in-month field. |
static int |
DAY_OF_YEAR
Constant representing the day of year time field. |
static int |
DECEMBER
Constant representing December. |
static int |
DST_OFFSET
Constant representing the daylight saving time offset in milliseconds. |
static int |
ERA
Constant representing the era time field. |
private boolean |
explicitDSTOffset
Is set to true if DST_OFFSET is explicitly set. |
static int |
FEBRUARY
Constant representing February. |
static int |
FIELD_COUNT
Number of time fields. |
private static java.lang.String[] |
fieldNames
|
protected int[] |
fields
The time fields. |
private int |
firstDayOfWeek
Sets what the first day of week is. |
static int |
FRIDAY
Constant representing Friday. |
static int |
HOUR
Constant representing the hour time field for 12-hour clock. |
static int |
HOUR_OF_DAY
Constant representing the hour of day time field for 24-hour clock. |
protected boolean[] |
isSet
The flags which tell if the fields above have a value. |
protected boolean |
isTimeSet
Tells if the above field has a valid value. |
static int |
JANUARY
Constant representing January. |
static int |
JULY
Constant representing July. |
static int |
JUNE
Constant representing June. |
private boolean |
lenient
Specifies if the date/time interpretation should be lenient. |
static int |
MARCH
Constant representing March. |
static int |
MAY
Constant representing May. |
static int |
MILLISECOND
Constant representing the millisecond time field. |
private int |
minimalDaysInFirstWeek
Sets how many days are required in the first week of the year. |
static int |
MINUTE
Constant representing the minute of hour time field. |
static int |
MONDAY
Constant representing Monday. |
static int |
MONTH
Constant representing the month time field. |
static int |
NOVEMBER
Constant representing November. |
static int |
OCTOBER
Constant representing October. |
static int |
PM
Useful constant for 12-hour clock. |
static int |
SATURDAY
Constant representing Saturday. |
static int |
SECOND
Constant representing the second time field. |
static int |
SEPTEMBER
Constant representing September. |
private int |
serialVersionOnStream
The version of the serialized data on the stream. |
(package private) static long |
serialVersionUID
XXX - I have not checked the compatibility. |
static int |
SUNDAY
Constant representing Sunday. |
static int |
THURSDAY
Constant representing Thursday. |
protected long |
time
The time in milliseconds since the epoch. |
static int |
TUESDAY
Constant representing Tuesday. |
static int |
UNDECIMBER
Constant representing Undecimber. |
static int |
WEDNESDAY
Constant representing Wednesday. |
static int |
WEEK_OF_MONTH
Constant representing the week of the month time field. |
static int |
WEEK_OF_YEAR
Constant representing the week of the year field. |
static int |
YEAR
Constant representing the year time field. |
private TimeZone |
zone
The time zone of this calendar. |
static int |
ZONE_OFFSET
Constant representing the time zone offset time field for the time given in the other fields. |
| Constructor Summary | |
protected |
Calendar()
Constructs a new Calendar with the default time zone and the default locale. |
protected |
Calendar(TimeZone zone,
Locale locale)
Constructs a new Calendar with the given time zone and the given locale. |
| Method Summary | |
abstract void |
add(int field,
int amount)
Adds the specified amount of time to the given time field. |
boolean |
after(java.lang.Object o)
Compares the given calendar with this. |
boolean |
before(java.lang.Object o)
Compares the given calendar with this. |
void |
clear()
Clears the values of all the time fields. |
void |
clear(int field)
Clears the values of the specified time field. |
java.lang.Object |
clone()
Return a clone of this object. |
protected void |
complete()
Fills any unset fields in the time field list |
protected abstract void |
computeFields()
Converts the milliseconds since the epoch UTC ( time) to time fields
(fields). |
protected abstract void |
computeTime()
Converts the time field values ( fields) to
milliseconds since the epoch UTC (time). |
boolean |
equals(java.lang.Object o)
Compares the given calendar with this. |
int |
get(int field)
Gets the value of the specified field. |
int |
getActualMaximum(int field)
Gets the actual maximum value that is allowed for the specified field. |
int |
getActualMinimum(int field)
Gets the actual minimum value that is allowed for the specified field. |
static Locale[] |
getAvailableLocales()
Gets the set of locales for which a Calendar is available. |
private static ResourceBundle |
getBundle(Locale locale)
get resource bundle: The resources should be loaded via this method only. |
int |
getFirstDayOfWeek()
Gets what the first day of week is. |
abstract int |
getGreatestMinimum(int field)
Gets the greatest minimum value that is allowed for the specified field. |
static Calendar |
getInstance()
Creates a calendar representing the actual time, using the default time zone and locale. |
static Calendar |
getInstance(Locale locale)
Creates a calendar representing the actual time, using the default time zone and the given locale. |
static Calendar |
getInstance(TimeZone zone)
Creates a calendar representing the actual time, using the given time zone and the default locale. |
static Calendar |
getInstance(TimeZone zone,
Locale locale)
Creates a calendar representing the actual time, using the given time zone and locale. |
abstract int |
getLeastMaximum(int field)
Gets the smallest maximum value that is allowed for the specified field. |
abstract int |
getMaximum(int field)
Gets the biggest value that is allowed for the specified field. |
int |
getMinimalDaysInFirstWeek()
Gets how many days are required in the first week of the year. |
abstract int |
getMinimum(int field)
Gets the smallest value that is allowed for the specified field. |
Date |
getTime()
Converts the time represented by this object to a Date-Object. |
long |
getTimeInMillis()
Returns the time represented by this Calendar. |
TimeZone |
getTimeZone()
Gets the time zone of this calendar |
int |
hashCode()
Returns a hash code for this calendar. |
protected int |
internalGet(int field)
Gets the value of the specified field. |
boolean |
isLenient()
Tells if the date/time interpretation is lenient. |
boolean |
isSet(int field)
Determines if the specified field has a valid value. |
private void |
readObject(java.io.ObjectInputStream stream)
Reads the object back from stream (deserialization). |
abstract void |
roll(int field,
boolean up)
Rolls the specified time field up or down. |
void |
roll(int field,
int amount)
Rolls up or down the specified time field by the given amount. |
void |
set(int field,
int value)
Sets the time field with the given value. |
void |
set(int year,
int month,
int date)
Sets the fields for year, month, and date |
void |
set(int year,
int month,
int date,
int hour,
int minute)
Sets the fields for year, month, date, hour, and minute |
void |
set(int year,
int month,
int date,
int hour,
int minute,
int second)
Sets the fields for year, month, date, hour, and minute |
void |
setFirstDayOfWeek(int value)
Sets what the first day of week is. |
void |
setLenient(boolean lenient)
Specifies if the date/time interpretation should be lenient. |
void |
setMinimalDaysInFirstWeek(int value)
Sets how many days are required in the first week of the year. |
void |
setTime(Date date)
Sets this Calendar's time to the given Date. |
void |
setTimeInMillis(long time)
Sets this Calendar's time to the given Time. |
void |
setTimeZone(TimeZone zone)
Sets the time zone to the specified value. |
java.lang.String |
toString()
Returns a string representation of this object. |
private void |
writeObject(java.io.ObjectOutputStream stream)
Saves the state of the object to the stream. |
| Methods inherited from class java.lang.Object |
finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
ERA
public static final int ERA
- Constant representing the era time field.
- See Also:
- Constant Field Values
YEAR
public static final int YEAR
- Constant representing the year time field.
- See Also:
- Constant Field Values
MONTH
public static final int MONTH
- Constant representing the month time field. This field
should contain one of the JANUARY,...,DECEMBER constants below.
- See Also:
- Constant Field Values
WEEK_OF_YEAR
public static final int WEEK_OF_YEAR
- Constant representing the week of the year field.
- See Also:
setFirstDayOfWeek(int)55 , Constant Field Values
WEEK_OF_MONTH
public static final int WEEK_OF_MONTH
- Constant representing the week of the month time field.
- See Also:
setFirstDayOfWeek(int)55 , Constant Field Values
DATE
public static final int DATE
- Constant representing the day time field, synonym for DAY_OF_MONTH.
- See Also:
- Constant Field Values
DAY_OF_MONTH
public static final int DAY_OF_MONTH
- Constant representing the day time field.
- See Also:
- Constant Field Values
DAY_OF_YEAR
public static final int DAY_OF_YEAR
- Constant representing the day of year time field. This is
1 for the first day in month.
- See Also:
- Constant Field Values
DAY_OF_WEEK
public static final int DAY_OF_WEEK
- Constant representing the day of week time field. This field
should contain one of the SUNDAY,...,SATURDAY constants below.
- See Also:
- Constant Field Values
DAY_OF_WEEK_IN_MONTH
public static final int DAY_OF_WEEK_IN_MONTH
- Constant representing the day-of-week-in-month field. For
instance this field contains 2 for the second thursday in a
month. If you give a negative number here, the day will count
from the end of the month.
- See Also:
- Constant Field Values
AM_PM
public static final int AM_PM
- Constant representing the part of the day for 12-hour clock. This
should be one of AM or PM.
- See Also:
- Constant Field Values
HOUR
public static final int HOUR
- Constant representing the hour time field for 12-hour clock.
- See Also:
- Constant Field Values
HOUR_OF_DAY
public static final int HOUR_OF_DAY
- Constant representing the hour of day time field for 24-hour clock.
- See Also:
- Constant Field Values
MINUTE
public static final int MINUTE
- Constant representing the minute of hour time field.
- See Also:
- Constant Field Values
SECOND
public static final int SECOND
- Constant representing the second time field.
- See Also:
- Constant Field Values
MILLISECOND
public static final int MILLISECOND
- Constant representing the millisecond time field.
- See Also:
- Constant Field Values
ZONE_OFFSET
public static final int ZONE_OFFSET
- Constant representing the time zone offset time field for the
time given in the other fields. It is measured in
milliseconds. The default is the offset of the time zone.
- See Also:
- Constant Field Values
DST_OFFSET
public static final int DST_OFFSET
- Constant representing the daylight saving time offset in
milliseconds. The default is the value given by the time zone.
- See Also:
- Constant Field Values
FIELD_COUNT
public static final int FIELD_COUNT
- Number of time fields.
- See Also:
- Constant Field Values
SUNDAY
public static final int SUNDAY
- Constant representing Sunday.
- See Also:
- Constant Field Values
MONDAY
public static final int MONDAY
- Constant representing Monday.
- See Also:
- Constant Field Values
TUESDAY
public static final int TUESDAY
- Constant representing Tuesday.
- See Also:
- Constant Field Values
WEDNESDAY
public static final int WEDNESDAY
- Constant representing Wednesday.
- See Also:
- Constant Field Values
THURSDAY
public static final int THURSDAY
- Constant representing Thursday.
- See Also:
- Constant Field Values
FRIDAY
public static final int FRIDAY
- Constant representing Friday.
- See Also:
- Constant Field Values
SATURDAY
public static final int SATURDAY
- Constant representing Saturday.
- See Also:
- Constant Field Values
JANUARY
public static final int JANUARY
- Constant representing January.
- See Also:
- Constant Field Values
FEBRUARY
public static final int FEBRUARY
- Constant representing February.
- See Also:
- Constant Field Values
MARCH
public static final int MARCH
- Constant representing March.
- See Also:
- Constant Field Values
APRIL
public static final int APRIL
- Constant representing April.
- See Also:
- Constant Field Values
MAY
public static final int MAY
- Constant representing May.
- See Also:
- Constant Field Values
JUNE
public static final int JUNE
- Constant representing June.
- See Also:
- Constant Field Values
JULY
public static final int JULY
- Constant representing July.
- See Also:
- Constant Field Values
AUGUST
public static final int AUGUST
- Constant representing August.
- See Also:
- Constant Field Values
SEPTEMBER
public static final int SEPTEMBER
- Constant representing September.
- See Also:
- Constant Field Values
OCTOBER
public static final int OCTOBER
- Constant representing October.
- See Also:
- Constant Field Values
NOVEMBER
public static final int NOVEMBER
- Constant representing November.
- See Also:
- Constant Field Values
DECEMBER
public static final int DECEMBER
- Constant representing December.
- See Also:
- Constant Field Values
UNDECIMBER
public static final int UNDECIMBER
- Constant representing Undecimber. This is an artificial name useful
for lunar calendars.
- See Also:
- Constant Field Values
AM
public static final int AM
- Useful constant for 12-hour clock.
- See Also:
- Constant Field Values
PM
public static final int PM
- Useful constant for 12-hour clock.
- See Also:
- Constant Field Values
fields
protected int[] fields
- The time fields. The array is indexed by the constants YEAR to
DST_OFFSET.
isSet
protected boolean[] isSet
- The flags which tell if the fields above have a value.
time
protected long time
- The time in milliseconds since the epoch.
isTimeSet
protected boolean isTimeSet
- Tells if the above field has a valid value.
areFieldsSet
protected boolean areFieldsSet
- Tells if the fields have a valid value. This superseeds the isSet
array.
zone
private TimeZone zone
- The time zone of this calendar. Used by sub classes to do UTC / local
time conversion. Sub classes can access this field with getTimeZone().
calendarClassName
private static final java.lang.String calendarClassName
- This is the default calendar class, that is returned on
java.util.Calendar.getInstance().
XXX - this isn't localized anywhere, is it?
- See Also:
getInstance()55 , Constant Field Values
lenient
private boolean lenient
- Specifies if the date/time interpretation should be lenient.
If the flag is set, a date such as "February 30, 1996" will be
treated as the 29th day after the February 1. If this flag
is false, such dates will cause an exception.
firstDayOfWeek
private int firstDayOfWeek
- Sets what the first day of week is. This is used for
WEEK_OF_MONTH and WEEK_OF_YEAR fields.
minimalDaysInFirstWeek
private int minimalDaysInFirstWeek
- Sets how many days are required in the first week of the year.
If the first day of the year should be the first week you should
set this value to 1. If the first week must be a full week, set
it to 7.
explicitDSTOffset
private boolean explicitDSTOffset
- Is set to true if DST_OFFSET is explicitly set. In that case
it's value overrides the value computed from the current
time and the timezone.
serialVersionOnStream
private int serialVersionOnStream
- The version of the serialized data on the stream.
- 0 or not present
- JDK 1.1.5 or later.
- 1
- JDK 1.1.6 or later. This always writes a correct `time' value on the stream, as well as the other fields, to be compatible with earlier versions
- Since:
- JDK1.1.6
serialVersionUID
static final long serialVersionUID
- XXX - I have not checked the compatibility. The documentation of
the serialized-form is quite hairy...
- See Also:
- Constant Field Values
bundleName
private static final java.lang.String bundleName
- The name of the resource bundle. Used only by getBundle()
- See Also:
- Constant Field Values
cache
private static HashMap cache
- Cache of locale->calendar-class mappings. This avoids having to do a ResourceBundle
lookup for every getInstance call.
ctorArgTypes
private static java.lang.Class[] ctorArgTypes
- Preset argument types for calendar-class constructor lookup.
fieldNames
private static final java.lang.String[] fieldNames
| Constructor Detail |
Calendar
protected Calendar()
- Constructs a new Calendar with the default time zone and the default
locale.
Calendar
protected Calendar(TimeZone zone, Locale locale)
- Constructs a new Calendar with the given time zone and the given
locale.
| Method Detail |
getBundle
private static ResourceBundle getBundle(Locale locale)
- get resource bundle:
The resources should be loaded via this method only. Iff an application
uses this method, the resourcebundle is required.
getInstance
public static Calendar getInstance()
- Creates a calendar representing the actual time, using the default
time zone and locale.
getInstance
public static Calendar getInstance(TimeZone zone)
- Creates a calendar representing the actual time, using the given
time zone and the default locale.
getInstance
public static Calendar getInstance(Locale locale)
- Creates a calendar representing the actual time, using the default
time zone and the given locale.
getInstance
public static Calendar getInstance(TimeZone zone, Locale locale)
- Creates a calendar representing the actual time, using the given
time zone and locale.
getAvailableLocales
public static Locale[] getAvailableLocales()
- Gets the set of locales for which a Calendar is available.
computeTime
protected abstract void computeTime()
- Converts the time field values (
fields) to milliseconds since the epoch UTC (time). Override this method if you write your own Calendar.
computeFields
protected abstract void computeFields()
- Converts the milliseconds since the epoch UTC
(
time) to time fields (fields). Override this method if you write your own Calendar.
getTime
public final Date getTime()
- Converts the time represented by this object to a
Date-Object.
setTime
public final void setTime(Date date)
- Sets this Calendar's time to the given Date. All time fields
are invalidated by this method.
getTimeInMillis
public long getTimeInMillis()
- Returns the time represented by this Calendar.
setTimeInMillis
public void setTimeInMillis(long time)
- Sets this Calendar's time to the given Time. All time fields
are invalidated by this method.
get
public int get(int field)
- Gets the value of the specified field. They are recomputed
if they are invalid.
internalGet
protected final int internalGet(int field)
- Gets the value of the specified field. This method doesn't
recompute the fields, if they are invalid.
set
public void set(int field,
int value)
- Sets the time field with the given value. This does invalidate
the time in milliseconds.
set
public final void set(int year,
int month,
int date)
- Sets the fields for year, month, and date
set
public final void set(int year,
int month,
int date,
int hour,
int minute)
- Sets the fields for year, month, date, hour, and minute
set
public final void set(int year,
int month,
int date,
int hour,
int minute,
int second)
- Sets the fields for year, month, date, hour, and minute
clear
public final void clear()
- Clears the values of all the time fields.
clear
public final void clear(int field)
- Clears the values of the specified time field.
isSet
public final boolean isSet(int field)
- Determines if the specified field has a valid value.
complete
protected void complete()
- Fills any unset fields in the time field list
equals
public boolean equals(java.lang.Object o)
- Compares the given calendar with this.
hashCode
public int hashCode()
- Returns a hash code for this calendar.
before
public boolean before(java.lang.Object o)
- Compares the given calendar with this.
- Since:
- JDK1.2 you don't need to override this method
after
public boolean after(java.lang.Object o)
- Compares the given calendar with this.
- Since:
- JDK1.2 you don't need to override this method
add
public abstract void add(int field,
int amount)
- Adds the specified amount of time to the given time field. The
amount may be negative to subtract the time. If the field overflows
it does what you expect: Jan, 25 + 10 Days is Feb, 4.
roll
public abstract void roll(int field,
boolean up)
- Rolls the specified time field up or down. This means add one
to the specified field, but don't change the other fields. If
the maximum for this field is reached, start over with the
minimum value.
Note: There may be situation, where the other fields must be changed, e.g rolling the month on May, 31. The date June, 31 is automatically converted to July, 1.
roll
public void roll(int field,
int amount)
- Rolls up or down the specified time field by the given amount.
A negative amount rolls down. The default implementation is
call
roll(int, boolean)for the specified amount. Subclasses should override this method to do more intuitiv things.- Since:
- JDK1.2
setTimeZone
public void setTimeZone(TimeZone zone)
- Sets the time zone to the specified value.
getTimeZone
public TimeZone getTimeZone()
- Gets the time zone of this calendar
setLenient
public void setLenient(boolean lenient)
- Specifies if the date/time interpretation should be lenient.
If the flag is set, a date such as "February 30, 1996" will be
treated as the 29th day after the February 1. If this flag
is false, such dates will cause an exception.
isLenient
public boolean isLenient()
- Tells if the date/time interpretation is lenient.
setFirstDayOfWeek
public void setFirstDayOfWeek(int value)
- Sets what the first day of week is. This is used for
WEEK_OF_MONTH and WEEK_OF_YEAR fields.
getFirstDayOfWeek
public int getFirstDayOfWeek()
- Gets what the first day of week is. This is used for
WEEK_OF_MONTH and WEEK_OF_YEAR fields.
setMinimalDaysInFirstWeek
public void setMinimalDaysInFirstWeek(int value)
- Sets how many days are required in the first week of the year.
If the first day of the year should be the first week you should
set this value to 1. If the first week must be a full week, set
it to 7.
getMinimalDaysInFirstWeek
public int getMinimalDaysInFirstWeek()
- Gets how many days are required in the first week of the year.
getMinimum
public abstract int getMinimum(int field)
- Gets the smallest value that is allowed for the specified field.
getMaximum
public abstract int getMaximum(int field)
- Gets the biggest value that is allowed for the specified field.
getGreatestMinimum
public abstract int getGreatestMinimum(int field)
- Gets the greatest minimum value that is allowed for the specified field.
getLeastMaximum
public abstract int getLeastMaximum(int field)
- Gets the smallest maximum value that is allowed for the
specified field. For example this is 28 for DAY_OF_MONTH.
getActualMinimum
public int getActualMinimum(int field)
- Gets the actual minimum value that is allowed for the specified field.
This value is dependent on the values of the other fields.
- Since:
- jdk1.2
getActualMaximum
public int getActualMaximum(int field)
- Gets the actual maximum value that is allowed for the specified field.
This value is dependent on the values of the other fields.
- Since:
- jdk1.2
clone
public java.lang.Object clone()
- Return a clone of this object.
toString
public java.lang.String toString()
- Returns a string representation of this object. It is mainly
for debugging purposes and its content is implementation
specific.
writeObject
private void writeObject(java.io.ObjectOutputStream stream) throws java.io.IOException
- Saves the state of the object to the stream. Ideally we would
only write the time field, but we need to be compatible with
earlier versions.
This doesn't write the JDK1.1 field nextStamp to the stream, as I don't know what it is good for, and because the documentation says, that it could be omitted.
readObject
private void readObject(java.io.ObjectInputStream stream) throws java.io.IOException, java.lang.ClassNotFoundException
- Reads the object back from stream (deserialization).
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java.util.Calendar