java.lang.Object
- org.apache.commons.lang3.time.FastDatePrinter

All Implemented Interfaces:

java.io.Serializable, DatePrinter
```
public class FastDatePrinter
extends java.lang.Object
implements DatePrinter, java.io.Serializable
```
FastDatePrinter is a fast and thread-safe version of SimpleDateFormat.
To obtain a FastDatePrinter, use FastDateFormat.getInstance(String, TimeZone, Locale) or another variation of the factory methods of FastDateFormat.

Since FastDatePrinter is thread safe, you can use a static member instance:
private static final DatePrinter DATE_PRINTER = FastDateFormat.getInstance("yyyy-MM-dd");
This class can be used as a direct replacement to SimpleDateFormat in most formatting 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.

Only formatting is supported by this class, but all patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).

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.

Starting with JDK7, ISO 8601 support was added using the pattern 'X'. To maintain compatibility, 'ZZ' will continue to be supported, but using one of the 'X' formats is recommended.
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. FastDatePrinter implements the behavior of Java 7.

Since:

3.2

See Also:

FastDateParser, Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`private static class`	`FastDatePrinter.CharacterLiteral`	Inner class to output a constant single character.
`private static class`	`FastDatePrinter.DayInWeekField`	Inner class to output the numeric day in week.
`private static class`	`FastDatePrinter.Iso8601_Rule`	Inner class to output a time zone as a number `+/-HHMM` or `+/-HH:MM`.
`private static interface`	`FastDatePrinter.NumberRule`	Inner class defining a numeric rule.
`private static class`	`FastDatePrinter.PaddedNumberField`	Inner class to output a padded number.
`private static interface`	`FastDatePrinter.Rule`	Inner class defining a rule.
`private static class`	`FastDatePrinter.StringLiteral`	Inner class to output a constant string.
`private static class`	`FastDatePrinter.TextField`	Inner class to output one of a set of values.
`private static class`	`FastDatePrinter.TimeZoneDisplayKey`	Inner class that acts as a compound key for time zone names.
`private static class`	`FastDatePrinter.TimeZoneNameRule`	Inner class to output a time zone name.
`private static class`	`FastDatePrinter.TimeZoneNumberRule`	Inner class to output a time zone as a number `+/-HHMM` or `+/-HH:MM`.
`private static class`	`FastDatePrinter.TwelveHourField`	Inner class to output the twelve hour field.
`private static class`	`FastDatePrinter.TwentyFourHourField`	Inner class to output the twenty four hour field.
`private static class`	`FastDatePrinter.TwoDigitMonthField`	Inner class to output a two digit month.
`private static class`	`FastDatePrinter.TwoDigitNumberField`	Inner class to output a two digit number.
`private static class`	`FastDatePrinter.TwoDigitYearField`	Inner class to output a two digit year.
`private static class`	`FastDatePrinter.UnpaddedMonthField`	Inner class to output an unpadded month.
`private static class`	`FastDatePrinter.UnpaddedNumberField`	Inner class to output an unpadded number.
`private static class`	`FastDatePrinter.WeekYear`	Inner class to output the numeric day in week.

Field Summary

Fields
Modifier and Type	Field	Description
`private static FastDatePrinter.Rule[]`	`EMPTY_RULE_ARRAY`	Empty array.
`static int`	`FULL`	FULL locale dependent date or time style.
`private java.util.Locale`	`locale`	The locale.
`static int`	`LONG`	LONG locale dependent date or time style.
`private static int`	`MAX_DIGITS`
`private int`	`maxLengthEstimate`	The estimated maximum length.
`static int`	`MEDIUM`	MEDIUM locale dependent date or time style.
`private java.lang.String`	`pattern`	The pattern.
`private FastDatePrinter.Rule[]`	`rules`	The parsed rules.
`private static long`	`serialVersionUID`	Required for serialization support.
`static int`	`SHORT`	SHORT locale dependent date or time style.
`private java.util.TimeZone`	`timeZone`	The time zone.
`private static java.util.concurrent.ConcurrentMap<FastDatePrinter.TimeZoneDisplayKey,java.lang.String>`	`timeZoneDisplayCache`

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`FastDatePrinter(java.lang.String pattern, java.util.TimeZone timeZone, java.util.Locale locale)`	Constructs a new FastDatePrinter.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`private static void`	`appendDigits(java.lang.Appendable buffer, int value)`	Appends two digits to the given buffer.
`private static void`	`appendFullDigits(java.lang.Appendable buffer, int value, int minFieldWidth)`	Appends all digits to the given buffer.
`private <B extends java.lang.Appendable> B`	`applyRules(java.util.Calendar calendar, B buf)`	Performs the formatting by applying the rules to the specified calendar.
`protected java.lang.StringBuffer`	`applyRules(java.util.Calendar calendar, java.lang.StringBuffer buf)`	Deprecated. use `format(Calendar)` or `format(Calendar, Appendable)`
`private java.lang.String`	`applyRulesToString(java.util.Calendar c)`	Creates a String representation of the given Calendar by applying the rules of this printer to it.
`(package private) static void`	`clear()`
`boolean`	`equals(java.lang.Object obj)`	Compares two objects for equality.
`java.lang.String`	`format(long millis)`	Formats a millisecond `long` value.
`<B extends java.lang.Appendable> B`	`format(long millis, B buf)`	Formats a millisecond `long` value into the supplied `Appendable`.
`java.lang.StringBuffer`	`format(long millis, java.lang.StringBuffer buf)`	Formats a millisecond `long` value into the supplied `StringBuffer`.
`(package private) java.lang.String`	`format(java.lang.Object obj)`	Formats a `Date`, `Calendar` or `Long` (milliseconds) object.
`java.lang.StringBuffer`	`format(java.lang.Object obj, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos)`	Deprecated. Use {`format(Date)`, {`format(Calendar)`, {`format(long)`.
`java.lang.String`	`format(java.util.Calendar calendar)`	Formats a `Calendar` object.
`<B extends java.lang.Appendable> B`	`format(java.util.Calendar calendar, B buf)`	Formats a `Calendar` object into the supplied `Appendable`.
`java.lang.StringBuffer`	`format(java.util.Calendar calendar, java.lang.StringBuffer buf)`	Formats a `Calendar` object into the supplied `StringBuffer`.
`java.lang.String`	`format(java.util.Date date)`	Formats a `Date` object using a `GregorianCalendar`.
`<B extends java.lang.Appendable> B`	`format(java.util.Date date, B buf)`	Formats a `Date` object into the supplied `Appendable` using a `GregorianCalendar`.
`java.lang.StringBuffer`	`format(java.util.Date date, java.lang.StringBuffer buf)`	Formats a `Date` object into the supplied `StringBuffer` using a `GregorianCalendar`.
`java.util.Locale`	`getLocale()`	Gets the locale used by this printer.
`int`	`getMaxLengthEstimate()`	Gets an estimate for the maximum string length that the formatter will produce.
`java.lang.String`	`getPattern()`	Gets the pattern used by this printer.
`java.util.TimeZone`	`getTimeZone()`	Gets the time zone used by this printer.
`(package private) static java.lang.String`	`getTimeZoneDisplay(java.util.TimeZone tz, boolean daylight, int style, java.util.Locale locale)`	Gets the time zone display name, using a cache for performance.
`int`	`hashCode()`	Returns a hash code compatible with equals.
`private void`	`init()`	Initializes the instance for first use.
`private java.util.Calendar`	`newCalendar()`	Creates a new Calendar instance.
`protected java.util.List<FastDatePrinter.Rule>`	`parsePattern()`	Returns a list of Rules given a pattern.
`protected java.lang.String`	`parseToken(java.lang.String pattern, int[] indexRef)`	Performs the parsing of tokens.
`private void`	`readObject(java.io.ObjectInputStream in)`	Create the object after serialization.
`protected FastDatePrinter.NumberRule`	`selectNumberRule(int field, int padding)`	Gets an appropriate rule for the padding required.
`java.lang.String`	`toString()`	Gets a debugging string version of this formatter.

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

- Field Detail
  - EMPTY_RULE_ARRAY
```
private static final FastDatePrinter.Rule[] EMPTY_RULE_ARRAY
```
    Empty array.
  - serialVersionUID
```
private static final long serialVersionUID
```
    Required for serialization support.
    
    See Also:
    
    Serializable, Constant Field Values
  - FULL
```
public static final int FULL
```
    FULL locale dependent date or time style.
    
    See Also:
    
    Constant Field Values
  - LONG
```
public static final int LONG
```
    LONG locale dependent date or time style.
    
    See Also:
    
    Constant Field Values
  - MEDIUM
```
public static final int MEDIUM
```
    MEDIUM locale dependent date or time style.
    
    See Also:
    
    Constant Field Values
  - SHORT
```
public static final int SHORT
```
    SHORT locale dependent date or time style.
    
    See Also:
    
    Constant Field Values
  - MAX_DIGITS
```
private static final int MAX_DIGITS
```
    See Also:
    
    Constant Field Values
  - timeZoneDisplayCache
```
private static final java.util.concurrent.ConcurrentMap<FastDatePrinter.TimeZoneDisplayKey,java.lang.String> timeZoneDisplayCache
```
  - pattern
```
private final java.lang.String pattern
```
    The pattern.
  - timeZone
```
private final java.util.TimeZone timeZone
```
    The time zone.
  - locale
```
private final java.util.Locale locale
```
    The locale.
  - rules
```
private transient FastDatePrinter.Rule[] rules
```
    The parsed rules.
  - maxLengthEstimate
```
private transient int maxLengthEstimate
```
    The estimated maximum length.
- Constructor Detail
  - FastDatePrinter
```
protected FastDatePrinter(java.lang.String pattern,
                          java.util.TimeZone timeZone,
                          java.util.Locale locale)
```
    Constructs a new FastDatePrinter. Use FastDateFormat.getInstance(String, TimeZone, Locale) or another variation of the factory methods of FastDateFormat to get a cached FastDatePrinter instance.
    
    Parameters:
    
    pattern - SimpleDateFormat compatible pattern
    
    timeZone - non-null time zone to use
    
    locale - non-null locale to use
    
    Throws:
    
    java.lang.NullPointerException - if pattern, timeZone, or locale is null.
- Method Detail
  - appendDigits
```
private static void appendDigits(java.lang.Appendable buffer,
                                 int value)
                          throws java.io.IOException
```
    Appends two digits to the given buffer.
    
    Parameters:
    
    buffer - the buffer to append to.
    
    value - the value to append digits from.
    
    Throws:
    
    java.io.IOException - If an I/O error occurs
  - appendFullDigits
```
private static void appendFullDigits(java.lang.Appendable buffer,
                                     int value,
                                     int minFieldWidth)
                              throws java.io.IOException
```
    Appends all digits to the given buffer.
    
    Parameters:
    
    buffer - the buffer to append to.
    
    value - the value to append digits from.
    
    minFieldWidth - Minimum field width.
    
    Throws:
    
    java.io.IOException - If an I/O error occurs
  - clear
```
static void clear()
```
  - getTimeZoneDisplay
```
static java.lang.String getTimeZoneDisplay(java.util.TimeZone tz,
                                           boolean daylight,
                                           int style,
                                           java.util.Locale locale)
```
    Gets the time zone display name, using a cache for performance.
    
    Parameters:
    
    tz - the zone to query
    
    daylight - true if daylight savings
    
    style - the style to use TimeZone.LONG or TimeZone.SHORT
    
    locale - the locale to use
    
    Returns:
    
    the textual name of the time zone
  - applyRules
```
private <B extends java.lang.Appendable> B applyRules(java.util.Calendar calendar,
                                                      B buf)
```
    Performs the formatting by applying the rules to the specified calendar.
    
    Type Parameters:
    
    B - the Appendable class type, usually StringBuilder or StringBuffer.
    
    Parameters:
    
    calendar - the calendar to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - applyRules
```
@Deprecated
protected java.lang.StringBuffer applyRules(java.util.Calendar calendar,
                                            java.lang.StringBuffer buf)
```
    Deprecated.
    use format(Calendar) or format(Calendar, Appendable)
    
    Performs the formatting by applying the rules to the specified calendar.
    
    Parameters:
    
    calendar - the calendar to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - applyRulesToString
```
private java.lang.String applyRulesToString(java.util.Calendar c)
```
    Creates a String representation of the given Calendar by applying the rules of this printer to it.
    
    Parameters:
    
    c - the Calendar to apply the rules to.
    
    Returns:
    
    a String representation of the given Calendar.
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Compares two objects for equality.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    obj - the object to compare to
    
    Returns:
    
    true if equal
  - format
```
public java.lang.String format(java.util.Calendar calendar)
```
    Description copied from interface: DatePrinter
    
    Formats a Calendar object. The TimeZone set on the Calendar is only used to adjust the time offset. The TimeZone specified during the construction of the Parser will determine the TimeZone used in the formatted string.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    calendar - the calendar to format.
    
    Returns:
    
    the formatted string
  - format
```
public <B extends java.lang.Appendable> B format(java.util.Calendar calendar,
                                                 B buf)
```
    Description copied from interface: DatePrinter
    
    Formats a Calendar object into the supplied Appendable. The TimeZone set on the Calendar is only used to adjust the time offset. The TimeZone specified during the construction of the Parser will determine the TimeZone used in the formatted string.
    
    Specified by:
    
    format in interface DatePrinter
    
    Type Parameters:
    
    B - the Appendable class type, usually StringBuilder or StringBuffer.
    
    Parameters:
    
    calendar - the calendar to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
public java.lang.StringBuffer format(java.util.Calendar calendar,
                                     java.lang.StringBuffer buf)
```
    Description copied from interface: DatePrinter
    
    Formats a Calendar object into the supplied StringBuffer. The TimeZone set on the Calendar is only used to adjust the time offset. The TimeZone specified during the construction of the Parser will determine the TimeZone used in the formatted string.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    calendar - the calendar to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
public java.lang.String format(java.util.Date date)
```
    Description copied from interface: DatePrinter
    
    Formats a Date object using a GregorianCalendar.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    date - the date to format
    
    Returns:
    
    the formatted string
  - format
```
public <B extends java.lang.Appendable> B format(java.util.Date date,
                                                 B buf)
```
    Description copied from interface: DatePrinter
    
    Formats a Date object into the supplied Appendable using a GregorianCalendar.
    
    Specified by:
    
    format in interface DatePrinter
    
    Type Parameters:
    
    B - the Appendable class type, usually StringBuilder or StringBuffer.
    
    Parameters:
    
    date - the date to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
public java.lang.StringBuffer format(java.util.Date date,
                                     java.lang.StringBuffer buf)
```
    Description copied from interface: DatePrinter
    
    Formats a Date object into the supplied StringBuffer using a GregorianCalendar.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    date - the date to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
public java.lang.String format(long millis)
```
    Description copied from interface: DatePrinter
    
    Formats a millisecond long value.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    millis - the millisecond value to format
    
    Returns:
    
    the formatted string
  - format
```
public <B extends java.lang.Appendable> B format(long millis,
                                                 B buf)
```
    Description copied from interface: DatePrinter
    
    Formats a millisecond long value into the supplied Appendable.
    
    Specified by:
    
    format in interface DatePrinter
    
    Type Parameters:
    
    B - the Appendable class type, usually StringBuilder or StringBuffer.
    
    Parameters:
    
    millis - the millisecond value to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
public java.lang.StringBuffer format(long millis,
                                     java.lang.StringBuffer buf)
```
    Description copied from interface: DatePrinter
    
    Formats a millisecond long value into the supplied StringBuffer.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    millis - the millisecond value to format
    
    buf - the buffer to format into
    
    Returns:
    
    the specified string buffer
  - format
```
java.lang.String format(java.lang.Object obj)
```
    Formats a Date, Calendar or Long (milliseconds) object.
    
    Parameters:
    
    obj - the object to format
    
    Returns:
    
    The formatted value.
    
    Since:
    
    3.5
  - format
```
@Deprecated
public java.lang.StringBuffer format(java.lang.Object obj,
                                     java.lang.StringBuffer toAppendTo,
                                     java.text.FieldPosition pos)
```
    Deprecated.
    Use {format(Date), {format(Calendar), {format(long).
    
    Formats a Date, Calendar or Long (milliseconds) object.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    
    obj - the object to format
    
    toAppendTo - the buffer to append to
    
    pos - the position - ignored
    
    Returns:
    
    the buffer passed in
    
    See Also:
    
    DateFormat.format(Object, StringBuffer, FieldPosition)
  - getLocale
```
public java.util.Locale getLocale()
```
    Description copied from interface: DatePrinter
    
    Gets the locale used by this printer.
    
    Specified by:
    
    getLocale in interface DatePrinter
    
    Returns:
    
    the locale
  - getMaxLengthEstimate
```
public 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.
    
    Returns:
    
    the maximum formatted length
  - getPattern
```
public java.lang.String getPattern()
```
    Description copied from interface: DatePrinter
    
    Gets the pattern used by this printer.
    
    Specified by:
    
    getPattern in interface DatePrinter
    
    Returns:
    
    the pattern, SimpleDateFormat compatible
  - getTimeZone
```
public java.util.TimeZone getTimeZone()
```
    Description copied from interface: DatePrinter
    
    Gets the time zone used by this printer.
    This zone is always used for Date printing.
    
    Specified by:
    
    getTimeZone in interface DatePrinter
    
    Returns:
    
    the time zone
  - hashCode
```
public int hashCode()
```
    Returns a hash code compatible with equals.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    a hash code compatible with equals
  - init
```
private void init()
```
    Initializes the instance for first use.
  - newCalendar
```
private java.util.Calendar newCalendar()
```
    Creates a new Calendar instance.
    
    Returns:
    
    a new Calendar instance.
  - parsePattern
```
protected java.util.List<FastDatePrinter.Rule> parsePattern()
```
    Returns a list of Rules given a pattern.
    
    Returns:
    
    a List of Rule objects
    
    Throws:
    
    java.lang.IllegalArgumentException - if pattern is invalid
  - parseToken
```
protected java.lang.String parseToken(java.lang.String pattern,
                                      int[] indexRef)
```
    Performs the parsing of tokens.
    
    Parameters:
    
    pattern - the pattern
    
    indexRef - index references
    
    Returns:
    
    parsed token
  - readObject
```
private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException
```
    Create the object after serialization. This implementation reinitializes the transient properties.
    
    Parameters:
    
    in - ObjectInputStream from which the object is being deserialized.
    
    Throws:
    
    java.io.IOException - if there is an IO issue.
    
    java.lang.ClassNotFoundException - if a class cannot be found.
  - selectNumberRule
```
protected FastDatePrinter.NumberRule selectNumberRule(int field,
                                                      int padding)
```
    Gets an appropriate rule for the padding required.
    
    Parameters:
    
    field - the field to get a rule for
    
    padding - the padding required
    
    Returns:
    
    a new rule with the correct padding
  - toString
```
public java.lang.String toString()
```
    Gets a debugging string version of this formatter.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    a debugging string

Class FastDatePrinter

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

EMPTY_RULE_ARRAY

serialVersionUID

FULL

LONG

MEDIUM

SHORT

MAX_DIGITS

timeZoneDisplayCache

pattern

timeZone

locale

rules

maxLengthEstimate

Constructor Detail

FastDatePrinter

Method Detail

appendDigits

appendFullDigits

clear

getTimeZoneDisplay

applyRules

applyRules

applyRulesToString

equals

format

format

format

format

format

format

format

format

format

format

format

getLocale

getMaxLengthEstimate

getPattern

getTimeZone

hashCode

init

newCalendar

parsePattern

parseToken

readObject

selectNumberRule

toString