Class NumberFormat
- All Implemented Interfaces:
- Serializable,- Cloneable
- Direct Known Subclasses:
- ChoiceFormat,- CompactNumberFormat,- DecimalFormat
NumberFormat is the abstract base class for all number
 formats. This class provides the interface for formatting and parsing
 numbers in a localized manner. This enables code that can be completely
 independent of the locale conventions for decimal points, thousands-separators,
 the particular decimal digits used, or whether the number format is even
 decimal. For example, this class could be used within an application to
 produce a number in a currency format according to the conventions of the desired
 locale.
 Getting a NumberFormat
To get aNumberFormat for the default Locale, use one of the static
 factory methods that return a concrete subclass of NumberFormat.
 The following formats all provide an example of formatting the Number
 "2000.50" with the US locale as the default locale.
 -  Use getInstance()orgetNumberInstance()to get a decimal format. For example,"2,000.5".
-  Use getIntegerInstance()to get an integer number format. For example,"2,000".
-  Use getCurrencyInstance()to get a currency number format. For example,"$2,000.50".
-  Use getCompactNumberInstance()to get a compact number format. For example,"2K".
-  Use getPercentInstance()to get a format for displaying percentages. For example,"200,050%".
NumberFormat for a different locale is required, use
 one of the overloaded factory methods that take Locale as a parameter,
 for example, getIntegerInstance(Locale). If the installed locale-sensitive
 service implementation does not support the given Locale, the parent
 locale chain will be looked up, and a Locale used that is supported.
 Locale Extensions
Formatting behavior can be changed when using a locale that contains any of the following Unicode extensions,- "nu" ( Numbering System) - Overrides the decimal digits used
- "rg" ( Region Override) - Overrides the country used
- "cf" ( Currency Format style) - Overrides the Currency Format style used
If both "nu" and "rg" are specified, the decimal digits from the "nu" extension supersedes the implicit one from the "rg" extension. Although Unicode extensions defines various keys and values, actual locale-sensitive service implementations in a Java Runtime Environment might not support any particular Unicode locale attributes or key/type pairs.
Below is an example of a "US" locale currency format with accounting style,
NumberFormat.getCurrencyInstance(Locale.forLanguageTag("en-US-u-cf-account"));Using NumberFormat
The following is an example of formatting and parsing in a localized fashion,NumberFormat currencyFormat = NumberFormat.getCurrencyInstance(Locale.US);
currencyFormat.format(100000); // returns "$100,000.00"
currencyFormat.parse("$100,000.00"); // returns 100000
Customizing NumberFormat
NumberFormat provides API to customize formatting and parsing behavior,
 -  setParseIntegerOnly(boolean); whentrue, will only return the integer portion of the number parsed from the String.
-  setMinimumFractionDigits(int); Use to adjust the expected digits when formatting. Use any of the other minimum/maximum or fraction/integer setter methods in the same manner.
-  setGroupingUsed(boolean); whentrue, formatted numbers will be displayed with grouping separators. Additionally, whenfalse, parsing will not expect grouping separators in the parsed String.
-  setStrict(boolean); whentrue, parsing will be done strictly. The behavior of strict parsing should be referred to in the implementingNumberFormatsubclass.
 To provide more control over formatting or parsing behavior, type checking can
 be done to safely convert to an implementing subclass of NumberFormat; this
 provides additional methods defined by the subclass.
 For example,
 
NumberFormat nFmt = NumberFormat.getInstance(Locale.US);
if (nFmt instanceof DecimalFormat dFmt) {
    dFmt.setDecimalSeparatorAlwaysShown(true);
    dFmt.format(100); // returns "100."
}
NumberFormat subclass returned by the factory methods is dependent
 on the locale-service provider implementation installed, and may not always
 be DecimalFormat or CompactNumberFormat.
 
 You can also use forms of the parse and format
 methods with ParsePosition and FieldPosition to
 allow you to:
 
- Progressively parse through pieces of a string
- Align the decimal point and other areas
-  If you are using a monospaced font with spacing for alignment,
      you can pass the FieldPositionin your format call, withfield=INTEGER_FIELD. On output,getEndIndexwill be set to the offset between the last character of the integer and the decimal. Add (desiredSpaceCount - getEndIndex) spaces at the front of the string.
-  If you are using proportional fonts,
      instead of padding with spaces, measure the width
      of the string in pixels from the start to getEndIndex. Then move the pen by (desiredPixelWidth - widthToAlignmentPoint) before drawing the text. It also works where there is no decimal, but possibly additional characters at the end, e.g., with parentheses in negative numbers: "(12)" for -12.
Leniency
NumberFormat by default, parses leniently. Subclasses may consider
 implementing strict parsing and as such, overriding and providing
 implementations for the optional isStrict() and setStrict(boolean) methods.
 
 Lenient parsing should be used when attempting to parse a number
 out of a String that contains non-numerical or non-format related values.
 For example, using a Locale.US currency format to parse the number
 1000 out of the String "$1,000.00 was paid".
 
 Strict parsing should be used when attempting to ensure a String adheres exactly
 to a locale's conventions, and can thus serve to validate input. For example, successfully
 parsing the number 1000.55 out of the String "1.000,55" confirms the String
 exactly adhered to the Locale.GERMANY numerical conventions.
 
Synchronization
Number formats are generally not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.- Implementation Requirements:
- Null Parameter Handling
 -  The format(double, StringBuffer, FieldPosition),format(long, StringBuffer, FieldPosition)andparse(String, ParsePosition)methods may throwNullPointerException, if any of their parameter isnull. The subclass may provide its own implementation and specification aboutNullPointerException.
 -  The default implementation provides rounding modes defined
 in RoundingModefor formatting numbers. It uses the round half-even algorithm. To change the rounding mode usesetRoundingMode. TheNumberFormatreturned by the static factory methods is configured to round floating point numbers using half-even rounding (seeRoundingMode.HALF_EVEN) for formatting.
 
-  The 
- Since:
- 1.1
- External Specifications
- See Also:
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Nested Class SummaryNested ClassesModifier and TypeClassDescriptionstatic classDefines constants that are used as attribute keys in theAttributedCharacterIteratorreturned fromNumberFormat.formatToCharacterIteratorand as field identifiers inFieldPosition.static enumA number format style.
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Field SummaryFieldsModifier and TypeFieldDescriptionstatic final intField constant used to construct a FieldPosition object.static final intField constant used to construct a FieldPosition object.
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptionclone()Overrides Cloneable.booleanCompares the specified object with thisNumberFormatfor equality.final Stringformat(double number) Specialization of format.abstract StringBufferformat(double number, StringBuffer toAppendTo, FieldPosition pos) Specialization of format.final Stringformat(long number) Specialization of format.abstract StringBufferformat(long number, StringBuffer toAppendTo, FieldPosition pos) Specialization of format.format(Object number, StringBuffer toAppendTo, FieldPosition pos) Formats a number and appends the resulting text to the given string buffer.static Locale[]Returns an array of all locales for which theget*Instancemethods of this class can return localized instances.static NumberFormatstatic NumberFormatgetCompactNumberInstance(Locale locale, NumberFormat.Style formatStyle) Returns a compact number format for the specifiedlocaleandformatStyle.Gets the currency used by this number format when formatting currency values.static final NumberFormatReturns a currency format for the current defaultFORMATlocale.static NumberFormatgetCurrencyInstance(Locale inLocale) Returns a currency format for the specified locale.static final NumberFormatReturns a general-purpose number format for the current defaultFORMATlocale.static NumberFormatgetInstance(Locale inLocale) Returns a general-purpose number format for the specified locale.static final NumberFormatReturns an integer number format for the current defaultFORMATlocale.static NumberFormatgetIntegerInstance(Locale inLocale) Returns an integer number format for the specified locale.intReturns the maximum number of digits allowed in the fraction portion of a number.intReturns the maximum number of digits allowed in the integer portion of a number.intReturns the minimum number of digits allowed in the fraction portion of a number.intReturns the minimum number of digits allowed in the integer portion of a number.static final NumberFormatReturns a general-purpose number format for the current defaultFORMATlocale.static NumberFormatgetNumberInstance(Locale inLocale) Returns a general-purpose number format for the specified locale.static final NumberFormatReturns a percentage format for the current defaultFORMATlocale.static NumberFormatgetPercentInstance(Locale inLocale) Returns a percentage format for the specified locale.Gets theRoundingModeused in this NumberFormat.inthashCode()Returns the hash code for thisNumberFormat.booleanReturns true if grouping is used in this format.booleanReturnstrueif this format will parse numbers as integers only.booleanisStrict()Returnstrueif this format will parse numbers strictly;falseotherwise.Parses text from the beginning of the given string to produce aNumber.abstract Numberparse(String source, ParsePosition parsePosition) Parses text from the beginning of the given string to produce aNumber.final ObjectparseObject(String source, ParsePosition pos) Parses text from the given string to produce an object.voidsetCurrency(Currency currency) Sets the currency used by this number format when formatting currency values.voidsetGroupingUsed(boolean newValue) Set whether or not grouping will be used in this format.voidsetMaximumFractionDigits(int newValue) Sets the maximum number of digits allowed in the fraction portion of a number. maximumFractionDigits must be ≥ minimumFractionDigits.voidsetMaximumIntegerDigits(int newValue) Sets the maximum number of digits allowed in the integer portion of a number. maximumIntegerDigits must be ≥ minimumIntegerDigits.voidsetMinimumFractionDigits(int newValue) Sets the minimum number of digits allowed in the fraction portion of a number. minimumFractionDigits must be ≤ maximumFractionDigits.voidsetMinimumIntegerDigits(int newValue) Sets the minimum number of digits allowed in the integer portion of a number. minimumIntegerDigits must be ≤ maximumIntegerDigits.voidsetParseIntegerOnly(boolean value) Sets whether or not numbers should be parsed as integers only.voidsetRoundingMode(RoundingMode roundingMode) Sets theRoundingModeused in this NumberFormat.voidsetStrict(boolean strict) Change the leniency value for parsing.Methods declared in class java.text.Formatformat, formatToCharacterIterator, parseObject
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Field Details- 
INTEGER_FIELDpublic static final int INTEGER_FIELDField constant used to construct a FieldPosition object. Signifies that the position of the integer part of a formatted number should be returned.- See Also:
 
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FRACTION_FIELDpublic static final int FRACTION_FIELDField constant used to construct a FieldPosition object. Signifies that the position of the fraction part of a formatted number should be returned.- See Also:
 
 
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Constructor Details- 
NumberFormatprotected NumberFormat()Sole constructor. (For invocation by subclass constructors, typically implicit.)
 
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Method Details- 
formatFormats a number and appends the resulting text to the given string buffer. The number can be of any subclass ofNumber.This implementation extracts the number's value using Number.longValue()for all integral type values that can be converted tolongwithout loss of information, includingBigIntegervalues with abit lengthof less than 64, andNumber.doubleValue()for all other types. It then callsformat(long,java.lang.StringBuffer,java.text.FieldPosition)orformat(double,java.lang.StringBuffer,java.text.FieldPosition). This may result in loss of magnitude information and precision forBigIntegerandBigDecimalvalues.- Specified by:
- formatin class- Format
- Parameters:
- number- the number to format
- toAppendTo- the- StringBufferto which the formatted text is to be appended
- pos- keeps track on the position of the field within the returned string. For example, for formatting a number- 1234567.89in- Locale.USlocale, if the given- fieldPositionis- INTEGER_FIELD, the begin index and end index of- fieldPositionwill be set to 0 and 9, respectively for the output string- 1,234,567.89.
- Returns:
- the value passed in as toAppendTo
- Throws:
- IllegalArgumentException- if- numberis null or not an instance of- Number.
- NullPointerException- if- toAppendToor- posis null
- ArithmeticException- if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
- See Also:
 
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parseObjectParses text from the given string to produce an object.This method attempts to parse text starting at the index given by pos. If parsing succeeds, then the index ofposis updated to the index after the last character used (parsing does not necessarily use all characters up to the end of the string), and the parsed object is returned. The updatedposcan be used to indicate the starting point for the next call to this method. If an error occurs, then the index ofposis not changed, the error index ofposis set to the index of the character where the error occurred, andnullis returned.- Specified by:
- parseObjectin class- Format
- Implementation Requirements:
- This implementation is equivalent to calling parse(source, pos).
- Parameters:
- source- the- Stringto parse
- pos- A- ParsePositionobject with index and error index information as described above.
- Returns:
- A Numberparsed from the string. In case of error, returns null.
- Throws:
- NullPointerException- if- sourceor- posis null.
 
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formatSpecialization of format.- Parameters:
- number- the double number to format
- Returns:
- the formatted String
- Throws:
- ArithmeticException- if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
- See Also:
 
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formatSpecialization of format.- Parameters:
- number- the long number to format
- Returns:
- the formatted String
- Throws:
- ArithmeticException- if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
- See Also:
 
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formatSpecialization of format.- Parameters:
- number- the double number to format
- toAppendTo- the StringBuffer to which the formatted text is to be appended
- pos- keeps track on the position of the field within the returned string. For example, for formatting a number- 1234567.89in- Locale.USlocale, if the given- fieldPositionis- INTEGER_FIELD, the begin index and end index of- fieldPositionwill be set to 0 and 9, respectively for the output string- 1,234,567.89.
- Returns:
- the formatted StringBuffer
- Throws:
- ArithmeticException- if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
- See Also:
 
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formatSpecialization of format.- Parameters:
- number- the long number to format
- toAppendTo- the StringBuffer to which the formatted text is to be appended
- pos- keeps track on the position of the field within the returned string. For example, for formatting a number- 123456789in- Locale.USlocale, if the given- fieldPositionis- INTEGER_FIELD, the begin index and end index of- fieldPositionwill be set to 0 and 11, respectively for the output string- 123,456,789.
- Returns:
- the formatted StringBuffer
- Throws:
- ArithmeticException- if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
- See Also:
 
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parseParses text from the beginning of the given string to produce aNumber.This method attempts to parse text starting at the index given by the ParsePosition. If parsing succeeds, then the index of theParsePositionis updated to the index after the last character used (parsing does not necessarily use all characters up to the end of the string), and the parsed number is returned. The updatedParsePositioncan be used to indicate the starting point for the next call to this method. If an error occurs, then the index of theParsePositionis not changed, the error index of theParsePositionis set to the index of the character where the error occurred, andnullis returned.This method will return a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double. - Parameters:
- source- the- Stringto parse
- parsePosition- A- ParsePositionobject with index and error index information as described above.
- Returns:
- A Numberparsed from the string. In case of failure, returnsnull.
- Throws:
- NullPointerException- if- sourceor- ParsePositionis- null.
- See Also:
 
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parseParses text from the beginning of the given string to produce aNumber.This method will return a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double. - Parameters:
- source- A- String, to be parsed from the beginning.
- Returns:
- A Numberparsed from the string.
- Throws:
- ParseException- if parsing fails
- NullPointerException- if- sourceis- null.
- See Also:
 
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isParseIntegerOnlypublic boolean isParseIntegerOnly()Returnstrueif this format will parse numbers as integers only. TheParsePositionindex will be set to the position of the decimal symbol. The exact format accepted by the parse operation is locale dependent. For example in the English locale, with ParseIntegerOnly true, the string "123.45" would be parsed as the integer value 123.- Returns:
- trueif numbers should be parsed as integers only;- falseotherwise
 
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setParseIntegerOnlypublic void setParseIntegerOnly(boolean value) Sets whether or not numbers should be parsed as integers only.- Parameters:
- value-- trueif numbers should be parsed as integers only;- falseotherwise
- See Also:
 
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isStrictpublic boolean isStrict()Returnstrueif this format will parse numbers strictly;falseotherwise.- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses should override this method when implementing strict parsing.
- Returns:
- trueif this format will parse numbers strictly;- falseotherwise
- Throws:
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 23
- See Also:
 
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setStrictpublic void setStrict(boolean strict) Change the leniency value for parsing. Parsing can either be strict or lenient, by default it is lenient.- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses should override this method when implementing strict parsing.
- Parameters:
- strict-- trueif parsing should be done strictly;- falseotherwise
- Throws:
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 23
- See Also:
 
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getInstanceReturns a general-purpose number format for the current defaultFORMATlocale. This is the same as callinggetNumberInstance().- Returns:
- the NumberFormatinstance for general-purpose number formatting
 
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getInstanceReturns a general-purpose number format for the specified locale. This is the same as callinggetNumberInstance(inLocale).- Parameters:
- inLocale- the desired locale
- Returns:
- the NumberFormatinstance for general-purpose number formatting
 
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getNumberInstanceReturns a general-purpose number format for the current defaultFORMATlocale.This is equivalent to calling getNumberInstance(Locale.getDefault(Locale.Category.FORMAT)).- Returns:
- the NumberFormatinstance for general-purpose number formatting
- See Also:
 
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getNumberInstanceReturns a general-purpose number format for the specified locale.- Parameters:
- inLocale- the desired locale
- Returns:
- the NumberFormatinstance for general-purpose number formatting
 
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getIntegerInstanceReturns an integer number format for the current defaultFORMATlocale. The returned number format is configured to round floating point numbers to the nearest integer using half-even rounding (seeRoundingMode.HALF_EVEN) for formatting, and to parse only the integer part of an input string (seeisParseIntegerOnly).This is equivalent to calling getIntegerInstance(Locale.getDefault(Locale.Category.FORMAT)).- Returns:
- a number format for integer values
- Since:
- 1.4
- See Also:
 
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getIntegerInstanceReturns an integer number format for the specified locale. The returned number format is configured to round floating point numbers to the nearest integer using half-even rounding (seeRoundingMode.HALF_EVEN) for formatting, and to parse only the integer part of an input string (seeisParseIntegerOnly).- Parameters:
- inLocale- the desired locale
- Returns:
- a number format for integer values
- Since:
- 1.4
- See Also:
 
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getCurrencyInstanceReturns a currency format for the current defaultFORMATlocale.This is equivalent to calling getCurrencyInstance(Locale.getDefault(Locale.Category.FORMAT)).- Returns:
- the NumberFormatinstance for currency formatting
- See Also:
 
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getCurrencyInstanceReturns a currency format for the specified locale.If the specified locale contains the " cf" ( currency format style) Unicode extension, the returned currency format uses the style if it is available. Otherwise, the style uses the default "standard" currency format. For example, if the style designates "account", negative currency amounts use a pair of parentheses in some locales.- Parameters:
- inLocale- the desired locale
- Returns:
- the NumberFormatinstance for currency formatting
- External Specifications
 
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getPercentInstanceReturns a percentage format for the current defaultFORMATlocale.This is equivalent to calling getPercentInstance(Locale.getDefault(Locale.Category.FORMAT)).- Returns:
- the NumberFormatinstance for percentage formatting
- See Also:
 
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getPercentInstanceReturns a percentage format for the specified locale.- Parameters:
- inLocale- the desired locale
- Returns:
- the NumberFormatinstance for percentage formatting
 
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getCompactNumberInstance- Returns:
- A NumberFormatinstance for compact number formatting
- Since:
- 12
- See Also:
 
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getCompactNumberInstanceReturns a compact number format for the specifiedlocaleandformatStyle.- Parameters:
- locale- the desired locale
- formatStyle- the style for formatting a number
- Returns:
- A NumberFormatinstance for compact number formatting
- Throws:
- NullPointerException- if- localeor- formatStyleis- null
- Since:
- 12
- See Also:
 
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getAvailableLocalesReturns an array of all locales for which theget*Instancemethods of this class can return localized instances. The returned array represents the union of locales supported by the Java runtime and by installedNumberFormatProviderimplementations. At a minimum, the returned array must contain aLocaleinstance equal toLocale.ROOTand aLocaleinstance equal toLocale.US.- Returns:
- An array of locales for which localized
         NumberFormatinstances are available.
 
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hashCodepublic int hashCode()Returns the hash code for thisNumberFormat.- Overrides:
- hashCodein class- Object
- Implementation Requirements:
- This method calculates the hash code value using the values returned by
 getMaximumIntegerDigits()andgetMaximumFractionDigits().
- Returns:
- the hash code for this NumberFormat
- See Also:
 
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equalsCompares the specified object with thisNumberFormatfor equality. Returns true if the object is also aNumberFormatand the two formats would format any value the same.- Overrides:
- equalsin class- Object
- Implementation Requirements:
- This method performs an equality check with a notion of class
 identity based on getClass(), rather thaninstanceof. Therefore, in the equals methods in subclasses, no instance of this class should compare as equal to an instance of a subclass.
- Parameters:
- obj- object to be compared for equality
- Returns:
- trueif the specified object is equal to this- NumberFormat
- See Also:
 
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clone
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isGroupingUsedpublic boolean isGroupingUsed()Returns true if grouping is used in this format. For example, in the English locale, with grouping on, the number 1234567 might be formatted as "1,234,567". The grouping separator as well as the size of each group is locale dependent and is determined by sub-classes of NumberFormat.- Returns:
- trueif grouping is used;- falseotherwise
- See Also:
 
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setGroupingUsedpublic void setGroupingUsed(boolean newValue) Set whether or not grouping will be used in this format.- Parameters:
- newValue-- trueif grouping is used;- falseotherwise
- See Also:
 
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getMaximumIntegerDigitspublic int getMaximumIntegerDigits()Returns the maximum number of digits allowed in the integer portion of a number.- Returns:
- the maximum number of digits
- See Also:
 
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setMaximumIntegerDigitspublic void setMaximumIntegerDigits(int newValue) Sets the maximum number of digits allowed in the integer portion of a number. maximumIntegerDigits must be ≥ minimumIntegerDigits. If the new value for maximumIntegerDigits is less than the current value of minimumIntegerDigits, then minimumIntegerDigits will also be set to the new value.- Parameters:
- newValue- the maximum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
- See Also:
 
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getMinimumIntegerDigitspublic int getMinimumIntegerDigits()Returns the minimum number of digits allowed in the integer portion of a number.- Returns:
- the minimum number of digits
- See Also:
 
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setMinimumIntegerDigitspublic void setMinimumIntegerDigits(int newValue) Sets the minimum number of digits allowed in the integer portion of a number. minimumIntegerDigits must be ≤ maximumIntegerDigits. If the new value for minimumIntegerDigits exceeds the current value of maximumIntegerDigits, then maximumIntegerDigits will also be set to the new value- Parameters:
- newValue- the minimum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
- See Also:
 
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getMaximumFractionDigitspublic int getMaximumFractionDigits()Returns the maximum number of digits allowed in the fraction portion of a number.- Returns:
- the maximum number of digits.
- See Also:
 
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setMaximumFractionDigitspublic void setMaximumFractionDigits(int newValue) Sets the maximum number of digits allowed in the fraction portion of a number. maximumFractionDigits must be ≥ minimumFractionDigits. If the new value for maximumFractionDigits is less than the current value of minimumFractionDigits, then minimumFractionDigits will also be set to the new value.- Parameters:
- newValue- the maximum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
- See Also:
 
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getMinimumFractionDigitspublic int getMinimumFractionDigits()Returns the minimum number of digits allowed in the fraction portion of a number.- Returns:
- the minimum number of digits
- See Also:
 
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setMinimumFractionDigitspublic void setMinimumFractionDigits(int newValue) Sets the minimum number of digits allowed in the fraction portion of a number. minimumFractionDigits must be ≤ maximumFractionDigits. If the new value for minimumFractionDigits exceeds the current value of maximumFractionDigits, then maximumFractionDigits will also be set to the new value- Parameters:
- newValue- the minimum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
- See Also:
 
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getCurrencyGets the currency used by this number format when formatting currency values. The initial value is derived in a locale dependent way. The returned value may benullif no valid currency could be determined and no currency has been set usingsetCurrency(Currency).- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses should override this method if currency formatting is desired.
- Returns:
- the currency used by this number format, or null
- Throws:
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 1.4
 
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setCurrencySets the currency used by this number format when formatting currency values. This does not update the minimum or maximum number of fraction digits used by the number format.- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses should override this method if currency formatting is desired.
- Parameters:
- currency- the new currency to be used by this number format
- Throws:
- NullPointerException- if- currencyis- null
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 1.4
 
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getRoundingModeGets theRoundingModeused in this NumberFormat.- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses which handle different rounding modes should override this method.
- Returns:
- The RoundingModeused for this NumberFormat.
- Throws:
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 1.6
- See Also:
 
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setRoundingModeSets theRoundingModeused in this NumberFormat.- Implementation Requirements:
- The default implementation always throws UnsupportedOperationException. Subclasses which handle different rounding modes should override this method.
- Parameters:
- roundingMode- The- RoundingModeto be used
- Throws:
- NullPointerException- if- roundingModeis- null
- UnsupportedOperationException- if the implementation of this method does not support this operation
- Since:
- 1.6
- See Also:
 
 
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