public class FastDateFormat extends Format implements DateParser, DatePrinter
FastDateFormat is a fast and thread-safe version of
SimpleDateFormat.
To obtain an instance of FastDateFormat, use one of the static factory methods:
getInstance(String, TimeZone, Locale), getDateInstance(int, TimeZone, Locale),
getTimeInstance(int, TimeZone, Locale), or getDateTimeInstance(int, int, TimeZone, Locale)
Since FastDateFormat is thread safe, you can use a static member instance:
private static final FastDateFormat DATE_FORMATTER = FastDateFormat.getDateTimeInstance(FastDateFormat.LONG, FastDateFormat.SHORT);
This class can be used as a direct replacement to
SimpleDateFormat in most formatting and parsing situations.
This class is especially useful in multi-threaded server environments.
SimpleDateFormat is not thread-safe in any JDK version,
nor will it be as Sun have closed the bug/RFE.
All patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).
Since 3.2, FastDateFormat supports parsing as well as printing.
Java 1.4 introduced a new pattern letter, 'Z', to represent
time zones in RFC822 format (eg. +0800 or -1100).
This pattern letter can be used here (on all JDK versions).
In addition, the pattern 'ZZ' has been made to represent
ISO 8601 extended format time zones (eg. +08:00 or -11:00).
This introduces a minor incompatibility with Java 1.4, but at a gain of
useful functionality.
Javadoc cites for the year pattern: For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number. Starting with Java 1.7 a pattern of 'Y' or 'YYY' will be formatted as '2003', while it was '03' in former Java versions. FastDateFormat implements the behavior of Java 7.
Format.Field| Modifier and Type | Field and Description |
|---|---|
static int |
FULL
FULL locale dependent date or time style.
|
static int |
LONG
LONG locale dependent date or time style.
|
static int |
MEDIUM
MEDIUM locale dependent date or time style.
|
static int |
SHORT
SHORT locale dependent date or time style.
|
| Modifier | Constructor and Description |
|---|---|
protected |
FastDateFormat(String pattern,
TimeZone timeZone,
Locale locale)
Constructs a new FastDateFormat.
|
protected |
FastDateFormat(String pattern,
TimeZone timeZone,
Locale locale,
Date centuryStart)
Constructs a new FastDateFormat.
|
| Modifier and Type | Method and Description |
|---|---|
protected StringBuffer |
applyRules(Calendar calendar,
StringBuffer buf)
Deprecated.
|
boolean |
equals(Object obj)
Compares two objects for equality.
|
String |
format(Calendar calendar)
Formats a
Calendar object. |
<B extends Appendable> |
format(Calendar calendar,
B buf)
Formats a
Calendar object into the
supplied StringBuffer. |
StringBuffer |
format(Calendar calendar,
StringBuffer buf)
Deprecated.
|
String |
format(Date date)
Formats a
Date object using a GregorianCalendar. |
<B extends Appendable> |
format(Date date,
B buf)
Formats a
Date object into the
supplied StringBuffer using a GregorianCalendar. |
StringBuffer |
format(Date date,
StringBuffer buf)
Deprecated.
Use {
format(Date, Appendable). |
String |
format(long millis)
Formats a millisecond
long value. |
<B extends Appendable> |
format(long millis,
B buf)
Formats a millisecond
long value into the
supplied StringBuffer. |
StringBuffer |
format(long millis,
StringBuffer buf)
Deprecated.
Use {
format(long, Appendable). |
StringBuffer |
format(Object obj,
StringBuffer toAppendTo,
FieldPosition pos)
Formats a
Date, Calendar or
Long (milliseconds) object. |
static FastDateFormat |
getDateInstance(int style)
Gets a date formatter instance using the specified style in the
default time zone and locale.
|
static FastDateFormat |
getDateInstance(int style,
Locale locale)
Gets a date formatter instance using the specified style and
locale in the default time zone.
|
static FastDateFormat |
getDateInstance(int style,
TimeZone timeZone)
Gets a date formatter instance using the specified style and
time zone in the default locale.
|
static FastDateFormat |
getDateInstance(int style,
TimeZone timeZone,
Locale locale)
Gets a date formatter instance using the specified style, time
zone and locale.
|
static FastDateFormat |
getDateTimeInstance(int dateStyle,
int timeStyle)
Gets a date/time formatter instance using the specified style
in the default time zone and locale.
|
static FastDateFormat |
getDateTimeInstance(int dateStyle,
int timeStyle,
Locale locale)
Gets a date/time formatter instance using the specified style and
locale in the default time zone.
|
static FastDateFormat |
getDateTimeInstance(int dateStyle,
int timeStyle,
TimeZone timeZone)
Gets a date/time formatter instance using the specified style and
time zone in the default locale.
|
static FastDateFormat |
getDateTimeInstance(int dateStyle,
int timeStyle,
TimeZone timeZone,
Locale locale)
Gets a date/time formatter instance using the specified style,
time zone and locale.
|
static FastDateFormat |
getInstance()
Gets a formatter instance using the default pattern in the
default locale.
|
static FastDateFormat |
getInstance(String pattern)
Gets a formatter instance using the specified pattern in the
default locale.
|
static FastDateFormat |
getInstance(String pattern,
Locale locale)
Gets a formatter instance using the specified pattern and
locale.
|
static FastDateFormat |
getInstance(String pattern,
TimeZone timeZone)
Gets a formatter instance using the specified pattern and
time zone.
|
static FastDateFormat |
getInstance(String pattern,
TimeZone timeZone,
Locale locale)
Gets a formatter instance using the specified pattern, time zone
and locale.
|
Locale |
getLocale()
Gets the locale used by this formatter.
|
int |
getMaxLengthEstimate()
Gets an estimate for the maximum string length that the
formatter will produce.
|
String |
getPattern()
Gets the pattern used by this formatter.
|
static FastDateFormat |
getTimeInstance(int style)
Gets a time formatter instance using the specified style in the
default time zone and locale.
|
static FastDateFormat |
getTimeInstance(int style,
Locale locale)
Gets a time formatter instance using the specified style and
locale in the default time zone.
|
static FastDateFormat |
getTimeInstance(int style,
TimeZone timeZone)
Gets a time formatter instance using the specified style and
time zone in the default locale.
|
static FastDateFormat |
getTimeInstance(int style,
TimeZone timeZone,
Locale locale)
Gets a time formatter instance using the specified style, time
zone and locale.
|
TimeZone |
getTimeZone()
Gets the time zone used by this formatter.
|
int |
hashCode()
Returns a hash code compatible with equals.
|
Date |
parse(String source)
Equivalent to DateFormat.parse(String).
|
Date |
parse(String source,
ParsePosition pos)
Equivalent to DateFormat.parse(String, ParsePosition).
|
boolean |
parse(String source,
ParsePosition pos,
Calendar calendar)
Parses a formatted date string according to the format.
|
Object |
parseObject(String source,
ParsePosition pos)
Parses a date/time string according to the given parse position.
|
String |
toString()
Gets a debugging string version of this formatter.
|
clone, format, formatToCharacterIterator, parseObjectfinalize, getClass, notify, notifyAll, wait, wait, waitparseObjectpublic static final int FULL
public static final int LONG
public static final int MEDIUM
public static final int SHORT
protected FastDateFormat(String pattern, TimeZone timeZone, Locale locale)
Constructs a new FastDateFormat.
pattern - SimpleDateFormat compatible patterntimeZone - non-null time zone to uselocale - non-null locale to useNullPointerException - if pattern, timeZone, or locale is null.protected FastDateFormat(String pattern, TimeZone timeZone, Locale locale, Date centuryStart)
Constructs a new FastDateFormat.
pattern - SimpleDateFormat compatible patterntimeZone - non-null time zone to uselocale - non-null locale to usecenturyStart - The start of the 100 year period to use as the "default century" for 2 digit year parsing. If centuryStart is null, defaults to now - 80 yearsNullPointerException - if pattern, timeZone, or locale is null.public static FastDateFormat getInstance()
Gets a formatter instance using the default pattern in the default locale.
public static FastDateFormat getInstance(String pattern)
Gets a formatter instance using the specified pattern in the default locale.
pattern - SimpleDateFormat compatible
patternIllegalArgumentException - if pattern is invalidpublic static FastDateFormat getInstance(String pattern, TimeZone timeZone)
Gets a formatter instance using the specified pattern and time zone.
pattern - SimpleDateFormat compatible
patterntimeZone - optional time zone, overrides time zone of
formatted dateIllegalArgumentException - if pattern is invalidpublic static FastDateFormat getInstance(String pattern, Locale locale)
Gets a formatter instance using the specified pattern and locale.
pattern - SimpleDateFormat compatible
patternlocale - optional locale, overrides system localeIllegalArgumentException - if pattern is invalidpublic static FastDateFormat getInstance(String pattern, TimeZone timeZone, Locale locale)
Gets a formatter instance using the specified pattern, time zone and locale.
pattern - SimpleDateFormat compatible
patterntimeZone - optional time zone, overrides time zone of
formatted datelocale - optional locale, overrides system localeIllegalArgumentException - if pattern is invalid
or nullpublic static FastDateFormat getDateInstance(int style)
Gets a date formatter instance using the specified style in the default time zone and locale.
style - date style: FULL, LONG, MEDIUM, or SHORTIllegalArgumentException - if the Locale has no date
pattern definedpublic static FastDateFormat getDateInstance(int style, Locale locale)
Gets a date formatter instance using the specified style and locale in the default time zone.
style - date style: FULL, LONG, MEDIUM, or SHORTlocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no date
pattern definedpublic static FastDateFormat getDateInstance(int style, TimeZone timeZone)
Gets a date formatter instance using the specified style and time zone in the default locale.
style - date style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted dateIllegalArgumentException - if the Locale has no date
pattern definedpublic static FastDateFormat getDateInstance(int style, TimeZone timeZone, Locale locale)
Gets a date formatter instance using the specified style, time zone and locale.
style - date style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted datelocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no date
pattern definedpublic static FastDateFormat getTimeInstance(int style)
Gets a time formatter instance using the specified style in the default time zone and locale.
style - time style: FULL, LONG, MEDIUM, or SHORTIllegalArgumentException - if the Locale has no time
pattern definedpublic static FastDateFormat getTimeInstance(int style, Locale locale)
Gets a time formatter instance using the specified style and locale in the default time zone.
style - time style: FULL, LONG, MEDIUM, or SHORTlocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no time
pattern definedpublic static FastDateFormat getTimeInstance(int style, TimeZone timeZone)
Gets a time formatter instance using the specified style and time zone in the default locale.
style - time style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted timeIllegalArgumentException - if the Locale has no time
pattern definedpublic static FastDateFormat getTimeInstance(int style, TimeZone timeZone, Locale locale)
Gets a time formatter instance using the specified style, time zone and locale.
style - time style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted timelocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no time
pattern definedpublic static FastDateFormat getDateTimeInstance(int dateStyle, int timeStyle)
Gets a date/time formatter instance using the specified style in the default time zone and locale.
dateStyle - date style: FULL, LONG, MEDIUM, or SHORTtimeStyle - time style: FULL, LONG, MEDIUM, or SHORTIllegalArgumentException - if the Locale has no date/time
pattern definedpublic static FastDateFormat getDateTimeInstance(int dateStyle, int timeStyle, Locale locale)
Gets a date/time formatter instance using the specified style and locale in the default time zone.
dateStyle - date style: FULL, LONG, MEDIUM, or SHORTtimeStyle - time style: FULL, LONG, MEDIUM, or SHORTlocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no date/time
pattern definedpublic static FastDateFormat getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone)
Gets a date/time formatter instance using the specified style and time zone in the default locale.
dateStyle - date style: FULL, LONG, MEDIUM, or SHORTtimeStyle - time style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted dateIllegalArgumentException - if the Locale has no date/time
pattern definedpublic static FastDateFormat getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone, Locale locale)
Gets a date/time formatter instance using the specified style, time zone and locale.
dateStyle - date style: FULL, LONG, MEDIUM, or SHORTtimeStyle - time style: FULL, LONG, MEDIUM, or SHORTtimeZone - optional time zone, overrides time zone of
formatted datelocale - optional locale, overrides system localeIllegalArgumentException - if the Locale has no date/time
pattern definedpublic StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
Formats a Date, Calendar or
Long (milliseconds) object.
Format.format(Object, StringBuffer, FieldPosition)format in interface DatePrinterformat in class Formatobj - the object to formattoAppendTo - the buffer to append topos - the position - ignoredDateFormat.format(Object, StringBuffer, FieldPosition)public String format(long millis)
Formats a millisecond long value.
format in interface DatePrintermillis - the millisecond value to formatpublic String format(Date date)
Formats a Date object using a GregorianCalendar.
format in interface DatePrinterdate - the date to formatpublic String format(Calendar calendar)
Formats a Calendar object.
format in interface DatePrintercalendar - the calendar to format@Deprecated public StringBuffer format(long millis, StringBuffer buf)
format(long, Appendable).Formats a millisecond long value into the
supplied StringBuffer.
format in interface DatePrintermillis - the millisecond value to formatbuf - the buffer to format into@Deprecated public StringBuffer format(Date date, StringBuffer buf)
format(Date, Appendable).Formats a Date object into the
supplied StringBuffer using a GregorianCalendar.
format in interface DatePrinterdate - the date to formatbuf - the buffer to format into@Deprecated public StringBuffer format(Calendar calendar, StringBuffer buf)
format(Calendar, Appendable).Formats a Calendar object into the
supplied StringBuffer.
format in interface DatePrintercalendar - the calendar to formatbuf - the buffer to format intopublic <B extends Appendable> B format(long millis, B buf)
Formats a millisecond long value into the
supplied StringBuffer.
format in interface DatePrinterB - the Appendable class type, usually StringBuilder or StringBuffer.millis - the millisecond value to formatbuf - the buffer to format intopublic <B extends Appendable> B format(Date date, B buf)
Formats a Date object into the
supplied StringBuffer using a GregorianCalendar.
format in interface DatePrinterB - the Appendable class type, usually StringBuilder or StringBuffer.date - the date to formatbuf - the buffer to format intopublic <B extends Appendable> B format(Calendar calendar, B buf)
Formats a Calendar object into the
supplied StringBuffer.
format in interface DatePrinterB - the Appendable class type, usually StringBuilder or StringBuffer.calendar - the calendar to formatbuf - the buffer to format intopublic Date parse(String source) throws ParseException
DateParserDateFormat.parse(String) for more information.parse in interface DateParsersource - A String whose beginning should be parsed.Date parsed from the stringParseException - if the beginning of the specified string cannot be parsed.public Date parse(String source, ParsePosition pos)
DateParserDateFormat.parse(String, ParsePosition) for more information.parse in interface DateParsersource - A String, part of which should be parsed.pos - A ParsePosition object with index and error index information
as described above.Date parsed from the string. In case of error, returns null.public boolean parse(String source, ParsePosition pos, Calendar calendar)
DateParserparse in interface DateParsersource - The text to parse.pos - On input, the position in the source to start parsing, on output, updated position.calendar - The calendar into which to set parsed fields.public Object parseObject(String source, ParsePosition pos)
DateParserparseObject in interface DateParserparseObject in class Formatsource - A String whose beginning should be parsed.pos - the parse positionjava.util.Date objectDateFormat.parseObject(String, ParsePosition)public String getPattern()
Gets the pattern used by this formatter.
getPattern in interface DateParsergetPattern in interface DatePrinterSimpleDateFormat compatiblepublic TimeZone getTimeZone()
Gets the time zone used by this formatter.
This zone is always used for Date formatting.
getTimeZone in interface DateParsergetTimeZone in interface DatePrinterpublic Locale getLocale()
Gets the locale used by this formatter.
getLocale in interface DateParsergetLocale in interface DatePrinterpublic int getMaxLengthEstimate()
Gets an estimate for the maximum string length that the formatter will produce.
The actual formatted length will almost always be less than or equal to this amount.
public boolean equals(Object obj)
Compares two objects for equality.
public int hashCode()
Returns a hash code compatible with equals.
public String toString()
Gets a debugging string version of this formatter.
@Deprecated protected StringBuffer applyRules(Calendar calendar, StringBuffer buf)
format(Calendar, Appendable)Performs the formatting by applying the rules to the specified calendar.
calendar - the calendar to formatbuf - the buffer to format intoCopyright © 2001–2018 The Apache Software Foundation. All rights reserved.