GregorianCalendar (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.util
Class GregorianCalendar

java.lang.Object
  java.util.Calendar
      java.util.GregorianCalendar

All Implemented Interfaces:: Serializable, Cloneable, Comparable<Calendar>

public class GregorianCalendar
extends Calendar
extends Calendar

GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.

GregorianCalendar is a hybrid calendar that supports both the Julian and Gregorian calendar systems with the support of a single discontinuity, which corresponds by default to the Gregorian date when the Gregorian calendar was instituted (October 15, 1582 in some countries, later in others). The cutover date may be changed by the caller by calling setGregorianChange().

Historically, in those countries which adopted the Gregorian calendar first, October 4, 1582 (Julian) was thus followed by October 15, 1582 (Gregorian). This calendar models this correctly. Before the Gregorian cutover, GregorianCalendar implements the Julian calendar. The only difference between the Gregorian and the Julian calendar is the leap year rule. The Julian calendar specifies leap years every four years, whereas the Gregorian calendar omits century years which are not divisible by 400.

GregorianCalendar implements proleptic Gregorian and Julian calendars. That is, dates are computed by extrapolating the current rules indefinitely far backward and forward in time. As a result, GregorianCalendar may be used for all years to generate meaningful and consistent results. However, dates obtained using GregorianCalendar are historically accurate only from March 1, 4 AD onward, when modern Julian calendar rules were adopted. Before this date, leap year rules were applied irregularly, and before 45 BC the Julian calendar did not even exist.

Prior to the institution of the Gregorian calendar, New Year's Day was March 25. To avoid confusion, this calendar always uses January 1. A manual adjustment may be made if desired for dates that are prior to the Gregorian changeover and which fall between January 1 and March 24.

Values calculated for the WEEK_OF_YEAR field range from 1 to 53. Week 1 for a year is the earliest seven day period starting on getFirstDayOfWeek() that contains at least getMinimalDaysInFirstWeek() days from that year. It thus depends on the values of getMinimalDaysInFirstWeek(), getFirstDayOfWeek(), and the day of the week of January 1. Weeks between week 1 of one year and week 1 of the following year are numbered sequentially from 2 to 52 or 53 (as needed).

For example, January 1, 1998 was a Thursday. If getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4 (these are the values reflecting ISO 8601 and many national standards), then week 1 of 1998 starts on December 29, 1997, and ends on January 4, 1998. If, however, getFirstDayOfWeek() is SUNDAY, then week 1 of 1998 starts on January 4, 1998, and ends on January 10, 1998; the first three days of 1998 then are part of week 53 of 1997.

Values calculated for the WEEK_OF_MONTH field range from 0 to 6. Week 1 of a month (the days with WEEK_OF_MONTH = 1) is the earliest set of at least getMinimalDaysInFirstWeek() contiguous days in that month, ending on the day before getFirstDayOfWeek(). Unlike week 1 of a year, week 1 of a month may be shorter than 7 days, need not start on getFirstDayOfWeek(), and will not include days of the previous month. Days of a month before week 1 have a WEEK_OF_MONTH of 0.

For example, if getFirstDayOfWeek() is SUNDAY and getMinimalDaysInFirstWeek() is 4, then the first week of January 1998 is Sunday, January 4 through Saturday, January 10. These days have a WEEK_OF_MONTH of 1. Thursday, January 1 through Saturday, January 3 have a WEEK_OF_MONTH of 0. If getMinimalDaysInFirstWeek() is changed to 3, then January 1 through January 3 have a WEEK_OF_MONTH of 1.

The clear methods set calendar field(s) undefined. GregorianCalendar uses the following default value for each calendar field if its value is undefined.

Field
Default Value

ERA AD

YEAR 1970

MONTH JANUARY

DAY_OF_MONTH 1

DAY_OF_WEEK the first day of week

WEEK_OF_MONTH 0

DAY_OF_WEEK_IN_MONTH 1

AM_PM AM

HOUR, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND 0

Default values are not applicable for the fields not listed above.

Field	Default Value
`ERA`	`AD`
`YEAR`	`1970`
`MONTH`	`JANUARY`
`DAY_OF_MONTH`	`1`
`DAY_OF_WEEK`	`the first day of week`
`WEEK_OF_MONTH`	`0`
`DAY_OF_WEEK_IN_MONTH`	`1`
`AM_PM`	`AM`
`HOUR, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND`	`0`

Example:

 // get the supported ids for GMT-08:00 (Pacific Standard Time)
 String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000);
 // if no ids were returned, something is wrong. get out.
 if (ids.length == 0)
     System.exit(0);

  // begin output
 System.out.println("Current Time");

 // create a Pacific Standard Time time zone
 SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);

 // set up rules for daylight savings time
 pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
 pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);

 // create a GregorianCalendar with the Pacific Daylight time zone
 // and the current date and time
 Calendar calendar = new GregorianCalendar(pdt);
 Date trialTime = new Date();
 calendar.setTime(trialTime);

 // print out a bunch of interesting things
 System.out.println("ERA: " + calendar.get(Calendar.ERA));
 System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
 System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
 System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
 System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
 System.out.println("DATE: " + calendar.get(Calendar.DATE));
 System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
 System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR));
 System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
 System.out.println("DAY_OF_WEEK_IN_MONTH: "
                    + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
 System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
 System.out.println("HOUR: " + calendar.get(Calendar.HOUR));
 System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
 System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
 System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
 System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
 System.out.println("ZONE_OFFSET: "
                    + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
 System.out.println("DST_OFFSET: "
                    + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));

 System.out.println("Current Time, with hour reset to 3");
 calendar.clear(Calendar.HOUR_OF_DAY); // so doesn't override
 calendar.set(Calendar.HOUR, 3);
 System.out.println("ERA: " + calendar.get(Calendar.ERA));
 System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
 System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
 System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
 System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
 System.out.println("DATE: " + calendar.get(Calendar.DATE));
 System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
 System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR));
 System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
 System.out.println("DAY_OF_WEEK_IN_MONTH: "
                    + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
 System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
 System.out.println("HOUR: " + calendar.get(Calendar.HOUR));
 System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
 System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
 System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
 System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
 System.out.println("ZONE_OFFSET: "
        + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // in hours
 System.out.println("DST_OFFSET: "
        + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // in hours

Since:: JDK1.1
See Also:: TimeZone, Serialized Form

Field Summary

static int AD
          Value of the ERA field indicating the common era (Anno Domini), also known as CE.

static int BC
          Value of the ERA field indicating the period before the common era (before Christ), also known as BCE.

Fields inherited from class java.util.Calendar

ALL_STYLES, AM, AM_PM, APRIL, areFieldsSet, AUGUST, DATE, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_WEEK_IN_MONTH, DAY_OF_YEAR, DECEMBER, DST_OFFSET, ERA, FEBRUARY, FIELD_COUNT, fields, FRIDAY, HOUR, HOUR_OF_DAY, isSet, isTimeSet, JANUARY, JULY, JUNE, LONG, MARCH, MAY, MILLISECOND, MINUTE, MONDAY, MONTH, NOVEMBER, OCTOBER, PM, SATURDAY, SECOND, SEPTEMBER, SHORT, SUNDAY, THURSDAY, time, TUESDAY, UNDECIMBER, WEDNESDAY, WEEK_OF_MONTH, WEEK_OF_YEAR, YEAR, ZONE_OFFSET

Constructor Summary

GregorianCalendar()
          Constructs a default GregorianCalendar using the current time in the default time zone with the default locale.

GregorianCalendar(int year, int month, int dayOfMonth)
          Constructs a GregorianCalendar with the given date set in the default time zone with the default locale.

GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute)
          Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.

GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute, int second)
          Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.

GregorianCalendar(Locale aLocale)
          Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.

GregorianCalendar(TimeZone zone)
          Constructs a GregorianCalendar based on the current time in the given time zone with the default locale.

GregorianCalendar(TimeZone zone, Locale aLocale)
          Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.

Method Summary

void add(int field, int amount)
          Adds the specified (signed) amount of time to the given calendar field, based on the calendar's rules.

Object clone()
          Creates and returns a copy of this object.

protected void computeFields()
          Converts the time value (millisecond offset from the Epoch) to calendar field values.

protected void computeTime()
          Converts calendar field values to the time value (millisecond offset from the Epoch).

boolean equals(Object obj)
          Compares this GregorianCalendar to the specified Object.

int getActualMaximum(int field)
          Returns the maximum value that this calendar field could have, taking into consideration the given time value and the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

int getActualMinimum(int field)
          Returns the minimum value that this calendar field could have, taking into consideration the given time value and the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

int getGreatestMinimum(int field)
          Returns the highest minimum value for the given calendar field of this GregorianCalendar instance.

Date getGregorianChange()
          Gets the Gregorian Calendar change date.

int getLeastMaximum(int field)
          Returns the lowest maximum value for the given calendar field of this GregorianCalendar instance.

int getMaximum(int field)
          Returns the maximum value for the given calendar field of this GregorianCalendar instance.

int getMinimum(int field)
          Returns the minimum value for the given calendar field of this GregorianCalendar instance.

TimeZone getTimeZone()
          Gets the time zone.

int hashCode()
          Generates the hash code for this GregorianCalendar object.

boolean isLeapYear(int year)
          Determines if the given year is a leap year.

void roll(int field, boolean up)
          Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.

void roll(int field, int amount)
          Adds a signed amount to the specified calendar field without changing larger fields.

void setGregorianChange(Date date)
          Sets the GregorianCalendar change date.

void setTimeZone(TimeZone zone)
          Sets the time zone with the given time zone value.

Methods inherited from class java.util.Calendar

after, before, clear, clear, compareTo, complete, get, getAvailableLocales, getDisplayName, getDisplayNames, getFirstDayOfWeek, getInstance, getInstance, getInstance, getInstance, getMinimalDaysInFirstWeek, getTime, getTimeInMillis, internalGet, isLenient, isSet, set, set, set, set, setFirstDayOfWeek, setLenient, setMinimalDaysInFirstWeek, setTime, setTimeInMillis, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Summary
`static int`	`AD` Value of the `ERA` field indicating the common era (Anno Domini), also known as CE.
`static int`	`BC` Value of the `ERA` field indicating the period before the common era (before Christ), also known as BCE.

Fields inherited from class java.util.Calendar
`ALL_STYLES, AM, AM_PM, APRIL, areFieldsSet, AUGUST, DATE, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_WEEK_IN_MONTH, DAY_OF_YEAR, DECEMBER, DST_OFFSET, ERA, FEBRUARY, FIELD_COUNT, fields, FRIDAY, HOUR, HOUR_OF_DAY, isSet, isTimeSet, JANUARY, JULY, JUNE, LONG, MARCH, MAY, MILLISECOND, MINUTE, MONDAY, MONTH, NOVEMBER, OCTOBER, PM, SATURDAY, SECOND, SEPTEMBER, SHORT, SUNDAY, THURSDAY, time, TUESDAY, UNDECIMBER, WEDNESDAY, WEEK_OF_MONTH, WEEK_OF_YEAR, YEAR, ZONE_OFFSET`

Constructor Summary
`GregorianCalendar()` Constructs a default `GregorianCalendar` using the current time in the default time zone with the default locale.
`GregorianCalendar(int year, int month, int dayOfMonth)` Constructs a `GregorianCalendar` with the given date set in the default time zone with the default locale.
`GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute)` Constructs a `GregorianCalendar` with the given date and time set for the default time zone with the default locale.
`GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute, int second)` Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.
`GregorianCalendar(Locale aLocale)` Constructs a `GregorianCalendar` based on the current time in the default time zone with the given locale.
`GregorianCalendar(TimeZone zone)` Constructs a `GregorianCalendar` based on the current time in the given time zone with the default locale.
`GregorianCalendar(TimeZone zone, Locale aLocale)` Constructs a `GregorianCalendar` based on the current time in the given time zone with the given locale.

Method Summary
`void`	`add(int field, int amount)` Adds the specified (signed) amount of time to the given calendar field, based on the calendar's rules.
`Object`	`clone()` Creates and returns a copy of this object.
`protected void`	`computeFields()` Converts the time value (millisecond offset from the Epoch) to calendar field values.
`protected void`	`computeTime()` Converts calendar field values to the time value (millisecond offset from the Epoch).
`boolean`	`equals(Object obj)` Compares this `GregorianCalendar` to the specified `Object`.
`int`	`getActualMaximum(int field)` Returns the maximum value that this calendar field could have, taking into consideration the given time value and the current values of the `getFirstDayOfWeek`, `getMinimalDaysInFirstWeek`, `getGregorianChange` and `getTimeZone` methods.
`int`	`getActualMinimum(int field)` Returns the minimum value that this calendar field could have, taking into consideration the given time value and the current values of the `getFirstDayOfWeek`, `getMinimalDaysInFirstWeek`, `getGregorianChange` and `getTimeZone` methods.
`int`	`getGreatestMinimum(int field)` Returns the highest minimum value for the given calendar field of this `GregorianCalendar` instance.
`Date`	`getGregorianChange()` Gets the Gregorian Calendar change date.
`int`	`getLeastMaximum(int field)` Returns the lowest maximum value for the given calendar field of this `GregorianCalendar` instance.
`int`	`getMaximum(int field)` Returns the maximum value for the given calendar field of this `GregorianCalendar` instance.
`int`	`getMinimum(int field)` Returns the minimum value for the given calendar field of this `GregorianCalendar` instance.
`TimeZone`	`getTimeZone()` Gets the time zone.
`int`	`hashCode()` Generates the hash code for this `GregorianCalendar` object.
`boolean`	`isLeapYear(int year)` Determines if the given year is a leap year.
`void`	`roll(int field, boolean up)` Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.
`void`	`roll(int field, int amount)` Adds a signed amount to the specified calendar field without changing larger fields.
`void`	`setGregorianChange(Date date)` Sets the `GregorianCalendar` change date.
`void`	`setTimeZone(TimeZone zone)` Sets the time zone with the given time zone value.

Methods inherited from class java.util.Calendar
`after, before, clear, clear, compareTo, complete, get, getAvailableLocales, getDisplayName, getDisplayNames, getFirstDayOfWeek, getInstance, getInstance, getInstance, getInstance, getMinimalDaysInFirstWeek, getTime, getTimeInMillis, internalGet, isLenient, isSet, set, set, set, set, setFirstDayOfWeek, setLenient, setMinimalDaysInFirstWeek, setTime, setTimeInMillis, toString`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

BC

public static final int BC

Value of the ERA field indicating the period before the common era (before Christ), also known as BCE. The sequence of years at the transition from BC to AD is ..., 2 BC, 1 BC, 1 AD, 2 AD,...

See Also:: Calendar.ERA, Constant Field Values

public static final int AD

Value of the ERA field indicating the common era (Anno Domini), also known as CE. The sequence of years at the transition from BC to AD is ..., 2 BC, 1 BC, 1 AD, 2 AD,...

See Also:: Calendar.ERA, Constant Field Values

Constructor Detail

GregorianCalendar

public GregorianCalendar()

Constructs a default GregorianCalendar using the current time in the default time zone with the default locale.

GregorianCalendar

public GregorianCalendar(TimeZone zone)

Constructs a GregorianCalendar based on the current time in the given time zone with the default locale.

Parameters:: zone - the given time zone.

GregorianCalendar

public GregorianCalendar(Locale aLocale)

Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.

Parameters:: aLocale - the given locale.

GregorianCalendar

public GregorianCalendar(TimeZone zone,
                         Locale aLocale)

Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.

Parameters:: zone - the given time zone.; aLocale - the given locale.

GregorianCalendar

public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth)

Constructs a GregorianCalendar with the given date set in the default time zone with the default locale.

Parameters:: year - the value used to set the YEAR calendar field in the calendar.; month - the value used to set the MONTH calendar field in the calendar. Month value is 0-based. e.g., 0 for January.; dayOfMonth - the value used to set the DAY_OF_MONTH calendar field in the calendar.

GregorianCalendar

public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth,
                         int hourOfDay,
                         int minute)

Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.

Parameters:: year - the value used to set the YEAR calendar field in the calendar.; month - the value used to set the MONTH calendar field in the calendar. Month value is 0-based. e.g., 0 for January.; dayOfMonth - the value used to set the DAY_OF_MONTH calendar field in the calendar.; hourOfDay - the value used to set the HOUR_OF_DAY calendar field in the calendar.; minute - the value used to set the MINUTE calendar field in the calendar.

GregorianCalendar

public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth,
                         int hourOfDay,
                         int minute,
                         int second)

Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.

Parameters:: year - the value used to set the YEAR calendar field in the calendar.; month - the value used to set the MONTH calendar field in the calendar. Month value is 0-based. e.g., 0 for January.; dayOfMonth - the value used to set the DAY_OF_MONTH calendar field in the calendar.; hourOfDay - the value used to set the HOUR_OF_DAY calendar field in the calendar.; minute - the value used to set the MINUTE calendar field in the calendar.; second - the value used to set the SECOND calendar field in the calendar.

Method Detail

setGregorianChange

public void setGregorianChange(Date date)

Sets the GregorianCalendar change date. This is the point when the switch from Julian dates to Gregorian dates occurred. Default is October 15, 1582 (Gregorian). Previous to this, dates will be in the Julian calendar.

To obtain a pure Julian calendar, set the change date to Date(Long.MAX_VALUE). To obtain a pure Gregorian calendar, set the change date to Date(Long.MIN_VALUE).

Parameters:: date - the given Gregorian cutover date.

getGregorianChange

public final Date getGregorianChange()

Gets the Gregorian Calendar change date. This is the point when the switch from Julian dates to Gregorian dates occurred. Default is October 15, 1582 (Gregorian). Previous to this, dates will be in the Julian calendar.

Returns:: the Gregorian cutover date for this GregorianCalendar object.

isLeapYear

public boolean isLeapYear(int year)

Determines if the given year is a leap year. Returns true if the given year is a leap year. To specify BC year numbers, 1 - year number must be given. For example, year BC 4 is specified as -3.

Parameters:: year - the given year.
Returns:: true if the given year is a leap year; false otherwise.

equals

public boolean equals(Object obj)

Compares this GregorianCalendar to the specified Object. The result is true if and only if the argument is a GregorianCalendar object that represents the same time value (millisecond offset from the Epoch) under the same Calendar parameters and Gregorian change date as this object.

Overrides:: equals in class Calendar

Parameters:: obj - the object to compare with.
Returns:: true if this object is equal to obj; false otherwise.
See Also:: Calendar.compareTo(Calendar)

hashCode

public int hashCode()

Generates the hash code for this GregorianCalendar object.

Overrides:: hashCode in class Calendar

Returns:: a hash code value for this object.
See Also:: Object.equals(java.lang.Object), Hashtable

add

public void add(int field,
                int amount)

Adds the specified (signed) amount of time to the given calendar field, based on the calendar's rules.

Add rule 1. The value of field after the call minus the value of field before the call is amount, modulo any overflow that has occurred in field. Overflow occurs when a field value exceeds its range and, as a result, the next larger field is incremented or decremented and the field value is adjusted back into its range.

Add rule 2. If a smaller field is expected to be invariant, but it is impossible for it to be equal to its prior value because of changes in its minimum or maximum after field is changed, then its value is adjusted to be as close as possible to its expected value. A smaller field represents a smaller unit of time. HOUR is a smaller field than DAY_OF_MONTH. No adjustment is made to smaller fields that are not expected to be invariant. The calendar system determines what fields are expected to be invariant.

Specified by:: add in class Calendar

Parameters:: field - the calendar field.; amount - the amount of date or time to be added to the field.
Throws:: IllegalArgumentException - if field is ZONE_OFFSET, DST_OFFSET, or unknown, or if any calendar fields have out-of-range values in non-lenient mode.
See Also:: Calendar.roll(int,int), Calendar.set(int,int)

roll

public void roll(int field,
                 boolean up)

Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.

Example: Consider a GregorianCalendar originally set to December 31, 1999. Calling roll(Calendar.MONTH, true) sets the calendar to January 31, 1999. The YEAR field is unchanged because it is a larger field than MONTH.

Specified by:: roll in class Calendar

Parameters:: up - indicates if the value of the specified calendar field is to be rolled up or rolled down. Use true if rolling up, false otherwise.; field - the time field.
Throws:: IllegalArgumentException - if field is ZONE_OFFSET, DST_OFFSET, or unknown, or if any calendar fields have out-of-range values in non-lenient mode.
See Also:: add(int,int), Calendar.set(int,int)

roll

public void roll(int field,
                 int amount)

Adds a signed amount to the specified calendar field without changing larger fields. A negative roll amount means to subtract from field without changing larger fields. If the specified amount is 0, this method performs nothing.

This method calls Calendar.complete() before adding the amount so that all the calendar fields are normalized. If there is any calendar field having an out-of-range value in non-lenient mode, then an IllegalArgumentException is thrown.

Example: Consider a GregorianCalendar originally set to August 31, 1999. Calling roll(Calendar.MONTH, 8) sets the calendar to April 30, 1999. Using a GregorianCalendar, the DAY_OF_MONTH field cannot be 31 in the month April. DAY_OF_MONTH is set to the closest possible value, 30. The YEAR field maintains the value of 1999 because it is a larger field than MONTH.

Example: Consider a GregorianCalendar originally set to Sunday June 6, 1999. Calling roll(Calendar.WEEK_OF_MONTH, -1) sets the calendar to Tuesday June 1, 1999, whereas calling add(Calendar.WEEK_OF_MONTH, -1) sets the calendar to Sunday May 30, 1999. This is because the roll rule imposes an additional constraint: The MONTH must not change when the WEEK_OF_MONTH is rolled. Taken together with add rule 1, the resultant date must be between Tuesday June 1 and Saturday June 5. According to add rule 2, the DAY_OF_WEEK, an invariant when changing the WEEK_OF_MONTH, is set to Tuesday, the closest possible value to Sunday (where Sunday is the first day of the week).

Overrides:: roll in class Calendar

Parameters:: field - the calendar field.; amount - the signed amount to add to field.
Throws:: IllegalArgumentException - if field is ZONE_OFFSET, DST_OFFSET, or unknown, or if any calendar fields have out-of-range values in non-lenient mode.
Since:: 1.2
See Also:: roll(int,boolean), add(int,int), Calendar.set(int,int)

getMinimum

public int getMinimum(int field)

Returns the minimum value for the given calendar field of this GregorianCalendar instance. The minimum value is defined as the smallest value returned by the get method for any possible time value, taking into consideration the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

Specified by:: getMinimum in class Calendar

Parameters:: field - the calendar field.
Returns:: the minimum value for the given calendar field.
See Also:: getMaximum(int), getGreatestMinimum(int), getLeastMaximum(int), getActualMinimum(int), getActualMaximum(int)

getMaximum

public int getMaximum(int field)

Returns the maximum value for the given calendar field of this GregorianCalendar instance. The maximum value is defined as the largest value returned by the get method for any possible time value, taking into consideration the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

Specified by:: getMaximum in class Calendar

Parameters:: field - the calendar field.
Returns:: the maximum value for the given calendar field.
See Also:: getMinimum(int), getGreatestMinimum(int), getLeastMaximum(int), getActualMinimum(int), getActualMaximum(int)

getGreatestMinimum

public int getGreatestMinimum(int field)

Returns the highest minimum value for the given calendar field of this GregorianCalendar instance. The highest minimum value is defined as the largest value returned by getActualMinimum(int) for any possible time value, taking into consideration the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

Specified by:: getGreatestMinimum in class Calendar

Parameters:: field - the calendar field.
Returns:: the highest minimum value for the given calendar field.
See Also:: getMinimum(int), getMaximum(int), getLeastMaximum(int), getActualMinimum(int), getActualMaximum(int)

getLeastMaximum

public int getLeastMaximum(int field)

Returns the lowest maximum value for the given calendar field of this GregorianCalendar instance. The lowest maximum value is defined as the smallest value returned by getActualMaximum(int) for any possible time value, taking into consideration the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

Specified by:: getLeastMaximum in class Calendar

Parameters:: field - the calendar field
Returns:: the lowest maximum value for the given calendar field.
See Also:: getMinimum(int), getMaximum(int), getGreatestMinimum(int), getActualMinimum(int), getActualMaximum(int)

getActualMinimum

public int getActualMinimum(int field)

Returns the minimum value that this calendar field could have, taking into consideration the given time value and the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods.

For example, if the Gregorian change date is January 10, 1970 and the date of this GregorianCalendar is January 20, 1970, the actual minimum value of the DAY_OF_MONTH field is 10 because the previous date of January 10, 1970 is December 27, 1996 (in the Julian calendar). Therefore, December 28, 1969 to January 9, 1970 don't exist.

Overrides:: getActualMinimum in class Calendar

Parameters:: field - the calendar field
Returns:: the minimum of the given field for the time value of this GregorianCalendar
Since:: 1.2
See Also:: getMinimum(int), getMaximum(int), getGreatestMinimum(int), getLeastMaximum(int), getActualMaximum(int)

getActualMaximum

public int getActualMaximum(int field)

Returns the maximum value that this calendar field could have, taking into consideration the given time value and the current values of the getFirstDayOfWeek, getMinimalDaysInFirstWeek, getGregorianChange and getTimeZone methods. For example, if the date of this instance is February 1, 2004, the actual maximum value of the DAY_OF_MONTH field is 29 because 2004 is a leap year, and if the date of this instance is February 1, 2005, it's 28.

Overrides:: getActualMaximum in class Calendar

Parameters:: field - the calendar field
Returns:: the maximum of the given field for the time value of this GregorianCalendar
Since:: 1.2
See Also:: getMinimum(int), getMaximum(int), getGreatestMinimum(int), getLeastMaximum(int), getActualMinimum(int)

clone

public Object clone()

Description copied from class: Calendar

Creates and returns a copy of this object.

Overrides:: clone in class Calendar

Returns:: a copy of this object.
See Also:: Cloneable

getTimeZone

public TimeZone getTimeZone()

Description copied from class: Calendar

Gets the time zone.

Overrides:: getTimeZone in class Calendar

Returns:: the time zone object associated with this calendar.

setTimeZone

public void setTimeZone(TimeZone zone)

Description copied from class: Calendar

Sets the time zone with the given time zone value.

Overrides:: setTimeZone in class Calendar

Parameters:: zone - the given time zone.

computeFields

protected void computeFields()

Converts the time value (millisecond offset from the Epoch) to calendar field values. The time is not recomputed first; to recompute the time, then the fields, call the complete method.

Specified by:: computeFields in class Calendar

See Also:: Calendar.complete()

computeTime

protected void computeTime()

Converts calendar field values to the time value (millisecond offset from the Epoch).

Specified by:: computeTime in class Calendar

Throws:: IllegalArgumentException - if any calendar fields are invalid.
See Also:: Calendar.complete(), Calendar.computeFields()

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GregorianCalendar (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

java.util Class GregorianCalendar

BC

AD

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

setGregorianChange

getGregorianChange

isLeapYear

equals

hashCode

add

roll

roll

getMinimum

getMaximum

getGreatestMinimum

getLeastMaximum

getActualMinimum

getActualMaximum

clone

getTimeZone

setTimeZone

computeFields

computeTime

java.util
Class GregorianCalendar