Class CompactNumberFormat
- All Implemented Interfaces:
Serializable, Cloneable
public final class CompactNumberFormat extends NumberFormat
CompactNumberFormat is a concrete subclass of NumberFormat that formats a decimal number in a localized compact form. Compact number formatting is designed for an environment with limited space. For example, displaying the formatted number 7M instead of
7,000,000.00 in the US locale. The
CompactNumberFormat class is defined by LDML's specification for Compact Number Formats.
Getting a CompactNumberFormat
To get a compact number format, use one of the ways listed below.- Use the factory method
NumberFormat.getCompactNumberInstance()to obtain a format for the default locale withSHORTstyle. - Use the factory methood
NumberFormat.getCompactNumberInstance(Locale, Style)to obtain a format for a different locale and to control the Style. - Use one of the
CompactNumberFormatconstructors, for example,CompactNumberFormat(decimalPattern, symbols, compactPatterns), to obtain aCompactNumberFormatwith further customization.
If a standard compact format for a given locale and style is desired, it is recommended to use one of the NumberFormat factory methods listed above. To use an instance method defined by CompactNumberFormat, the NumberFormat returned by these factory methods should be type checked before converted to CompactNumberFormat. 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.
Style
When usingNumberFormat.getCompactNumberInstance(Locale, Style), a compact form can be retrieved with either a SHORT or LONG style. For example, a SHORT style compact number instance in the US locale formats 10000 as
"10K". However, a LONG style instance in the same locale formats 10000 as "10 thousand". Using CompactNumberFormat
The following is an example of formatting and parsing in a localized manner,NumberFormat compactFormat = NumberFormat.getCompactNumberInstance(Locale.US, NumberFormat.Style.SHORT);
compactFormat.format(1000); // returns "1K"
compactFormat.parse("1K"); // returns 1000
Formatting
The default formatting behavior returns a formatted string with no fractional digits, however users can use thesetMinimumFractionDigits(int) method to include the fractional part. The number 1000.0 or 1000 is formatted as "1K" not "1.00K" (in the US locale). For this reason, the patterns provided for formatting contain only the minimum integer digits, prefix and/or suffix, but no fractional part. For example, patterns used are {"", "", "", 0K, 00K, ...}. If the pattern selected for formatting a number is "0" (special pattern), either explicit or defaulted, then the general number formatting provided by DecimalFormat for the specified locale is used. Rounding
CompactNumberFormat provides rounding modes defined in RoundingMode for formatting. By default, it uses RoundingMode.HALF_EVEN. Parsing
The default parsing behavior does not allow a grouping separator until grouping used is set totrue by using setGroupingUsed(boolean). The parsing of the fractional part depends on the isParseIntegerOnly(). For example, if the parse integer only is set to true, then the fractional part is skipped. Compact Number Patterns
The compactPatterns in CompactNumberFormat(decimalPattern, symbols, compactPatterns) are represented as a series of strings, where each string is a pattern that is used to format a range of numbers.
An example of the SHORT styled compact number patterns for the US locale is {"", "", "", "0K",
"00K", "000K", "0M", "00M", "000M", "0B", "00B", "000B", "0T", "00T", "000T"}, ranging from 100 to 1014. There can be any number of patterns and they are strictly index based starting from the range 100. For example, in the above patterns, the pattern at index 3 ("0K") is used for formatting a number in the range: 1000 <= number < 10000, index 4 ("00K") for formatting a number the range: 10000 <=
number < 100000, and so forth.
In most locales, patterns with the range 100-102 are empty strings, which implicitly means a special pattern "0". A special pattern "0" is used for any range which does not contain a compact pattern. This special pattern can appear explicitly for any specific range, or considered as a default pattern for an empty string.
Negative Subpatterns
A compact pattern contains a positive and negative subpattern separated by a subpattern boundary character';', for example, "0K;-0K". Each subpattern has a prefix, minimum integer digits, and suffix. The negative subpattern is optional, if absent, then the positive subpattern prefixed with the minus sign '-' (U+002D HYPHEN-MINUS) is used as the negative subpattern. That is, "0K" alone is equivalent to "0K;-0K". If there is an explicit negative subpattern, it serves only to specify the negative prefix and suffix. The number of minimum integer digits, and other characteristics are all the same as the positive pattern. That means that "0K;-00K" produces precisely the same behavior as "0K;-0K". Escaping Special Characters
Many characters in a compact pattern are taken literally, they are matched during parsing and output unchanged during formatting. Special characters, on the other hand, stand for other characters, strings, or classes of characters. These characters must be quoted using single quotes' (U+0027) unless noted otherwise, if they are to appear in the prefix or suffix as literals. For example, 0à¤'.'. Plurals
CompactNumberFormat support patterns for both singular and plural compact forms. For the plural form, the Pattern should consist of PluralPattern(s) separated by a space ' ' (U+0020) that are enumerated within a pair of curly brackets '{' (U+007B) and '}' (U+007D). In this format, each PluralPattern consists of its count, followed by a single colon ':' (U+003A) and a SimplePattern. As a space is reserved for separating subsequent PluralPatterns, it must be quoted to be used literally in either the prefix or suffix.
For example, while the pattern representing millions (106 ) in the US locale can be specified as the SimplePattern: "0 Million", for the German locale it can be specified as the PluralPattern: "{one:0' 'Million other:0' 'Millionen}".
A compact pattern has the following syntax, with count following LDML's Language Plural Rules:
Pattern:
SimplePattern
'{' PluralPattern [' ' PluralPattern]optional '}'
SimplePattern:
PositivePattern
PositivePattern [; NegativePattern]optional
PluralPattern:
Count:SimplePattern
Count:
"zero" / "one" / "two" / "few" / "many" / "other"
PositivePattern:
Prefixoptional MinimumInteger Suffixoptional
NegativePattern:
Prefixoptional MinimumInteger Suffixoptional
Prefix:
Any characters except the special pattern characters
Suffix:
Any characters except the special pattern characters
MinimumInteger:
0
0 MinimumInteger
- Since:
- 12
- External Specifications
- See Also:
Nested Class Summary
Nested classes/interfaces declared in class NumberFormat
NumberFormat.Field, NumberFormat.Style
Field Summary
Fields declared in class NumberFormat
FRACTION_FIELD, INTEGER_FIELD
Constructor Summary
| Constructor | Description |
|---|---|
CompactNumberFormat |
Creates a CompactNumberFormat using the given decimal pattern, decimal format symbols and compact patterns. |
CompactNumberFormat |
Creates a CompactNumberFormat using the given decimal pattern, decimal format symbols, compact patterns, and plural rules. |
Method Summary
| Modifier and Type | Method | Description |
|---|---|---|
CompactNumberFormat |
clone() |
Creates and returns a copy of this CompactNumberFormat instance. |
boolean |
equals |
Compares the specified object with this CompactNumberFormat for equality. |
StringBuffer |
format |
Formats a double to produce a string representing its compact form. |
StringBuffer |
format |
Formats a long to produce a string representing its compact form. |
final StringBuffer |
format |
Formats a number to produce a string representing its compact form. |
AttributedCharacterIterator |
formatToCharacterIterator |
Formats an Object producing an AttributedCharacterIterator. |
int |
getGroupingSize() |
Returns the grouping size. |
RoundingMode |
getRoundingMode() |
Gets the RoundingMode used in this CompactNumberFormat. |
int |
hashCode() |
Returns the hash code for this CompactNumberFormat. |
boolean |
isGroupingUsed() |
Returns true if grouping is used in this format. |
boolean |
isParseBigDecimal() |
Returns whether the parse(String, ParsePosition) method returns BigDecimal. |
boolean |
isParseIntegerOnly() |
Returns true if this format parses only an integer from the number component of a compact number. |
boolean |
isStrict() |
Returns true if this format will parse numbers strictly; false otherwise. |
Number |
parse |
Parses text from the beginning of the given string to produce a Number. |
void |
setGroupingSize |
Sets the grouping size. |
void |
setGroupingUsed |
Sets whether or not grouping will be used in this format. |
void |
setMaximumFractionDigits |
Sets the maximum number of digits allowed in the fraction portion of a number during formatting. |
void |
setMaximumIntegerDigits |
Sets the maximum number of digits allowed in the integer portion of a number during formatting. |
void |
setMinimumFractionDigits |
Sets the minimum number of digits allowed in the fraction portion of a number during formatting. |
void |
setMinimumIntegerDigits |
Sets the minimum number of digits allowed in the integer portion of a number during formatting. |
void |
setParseBigDecimal |
Sets whether the parse(String, ParsePosition) method returns BigDecimal. |
void |
setParseIntegerOnly |
Sets whether or not this format parses only an integer from the number component of a compact number. |
void |
setRoundingMode |
Sets the RoundingMode used in this CompactNumberFormat. |
void |
setStrict |
Change the leniency value for parsing. |
String |
toString() |
Returns a string identifying this CompactNumberFormat, for debugging. |
Methods declared in class NumberFormat
format, format, getAvailableLocales, getCompactNumberInstance, getCompactNumberInstance, getCurrency, getCurrencyInstance, getCurrencyInstance, getInstance, getInstance, getIntegerInstance, getIntegerInstance, getMaximumFractionDigits, getMaximumIntegerDigits, getMinimumFractionDigits, getMinimumIntegerDigits, getNumberInstance, getNumberInstance, getPercentInstance, getPercentInstance, parse, parseObject, setCurrency
Methods declared in class Format
format, parseObject
Constructor Details
CompactNumberFormat
public CompactNumberFormat(String decimalPattern, DecimalFormatSymbols symbols, String[] compactPatterns)
CompactNumberFormat using the given decimal pattern, decimal format symbols and compact patterns. To obtain the instance of CompactNumberFormat with the standard compact patterns for a Locale and Style, it is recommended to use the factory methods given by NumberFormat for compact number formatting. Below is an example of using the constructor,
String[] compactPatterns = {"", "", "", "a lot"};
NumberFormat fmt = new CompactNumberFormat("00", DecimalFormatSymbols.getInstance(Locale.US), compactPatterns);
fmt.format(1); // returns "01"
fmt.format(1000); // returns "a lot"
- Parameters:
-
decimalPattern- a decimal pattern for general number formatting -
symbols- the set of symbols to be used -
compactPatterns- an array of compact number patterns - Throws:
-
NullPointerException- if any of the given arguments isnull -
IllegalArgumentException- if the givendecimalPatternor thecompactPatternsarray contains an invalid pattern or if anullappears in the array of compact patterns - See Also:
CompactNumberFormat
public CompactNumberFormat(String decimalPattern, DecimalFormatSymbols symbols, String[] compactPatterns, String pluralRules)
CompactNumberFormat using the given decimal pattern, decimal format symbols, compact patterns, and plural rules. To obtain the instance of CompactNumberFormat with the standard compact patterns for a Locale, Style, and pluralRules, it is recommended to use the factory methods given by NumberFormat for compact number formatting. For example, NumberFormat.getCompactNumberInstance(Locale, Style).- Parameters:
-
decimalPattern- a decimal pattern for general number formatting -
symbols- the set of symbols to be used -
compactPatterns- an array of compact number patterns -
pluralRules- a String designating plural rules which associate theCountkeyword, such as "one", and the actual integer number. Its syntax is defined in Unicode Consortium's Plural rules syntax - Throws:
-
NullPointerException- if any of the given arguments isnull -
IllegalArgumentException- if the givendecimalPattern, thecompactPatternsarray contains an invalid pattern, anullappears in the array of compact patterns, or if the givenpluralRulescontains an invalid syntax - Since:
- 14
- External Specifications
- See Also:
Method Details
format
public final StringBuffer format(Object number, StringBuffer toAppendTo, FieldPosition fieldPosition)
Number.- Overrides:
-
formatin classNumberFormat - Parameters:
-
number- the number to format -
toAppendTo- theStringBufferto which the formatted text is to be appended -
fieldPosition- keeps track on the position of the field within the returned string. For example, for formatting a number123456789in theUS locale, if the givenfieldPositionisNumberFormat.INTEGER_FIELD, the begin index and end index offieldPositionwill be set to 0 and 3, respectively for the output string123M. Similarly, positions of the prefix and the suffix fields can be obtained usingNumberFormat.Field.PREFIXandNumberFormat.Field.SUFFIXrespectively. - Returns:
- the
StringBufferpassed in astoAppendTo - Throws:
-
IllegalArgumentException- ifnumberisnullor not an instance ofNumber -
NullPointerException- iftoAppendToorfieldPositionisnull -
ArithmeticException- if rounding is needed with rounding mode being set toRoundingMode.UNNECESSARY - See Also:
format
public StringBuffer format(double number, StringBuffer result, FieldPosition fieldPosition)
- Specified by:
-
formatin classNumberFormat - Parameters:
-
number- the double number to format -
result- where the text is to be appended -
fieldPosition- keeps track on the position of the field within the returned string. For example, to format a number1234567.89in theUS localeif the givenfieldPositionisNumberFormat.INTEGER_FIELD, the begin index and end index offieldPositionwill be set to 0 and 1, respectively for the output string1M. Similarly, positions of the prefix and the suffix fields can be obtained usingNumberFormat.Field.PREFIXandNumberFormat.Field.SUFFIXrespectively. - Returns:
- the
StringBufferpassed in asresult - Throws:
-
NullPointerException- ifresultorfieldPositionisnull -
ArithmeticException- if rounding is needed with rounding mode being set toRoundingMode.UNNECESSARY - See Also:
format
public StringBuffer format(long number, StringBuffer result, FieldPosition fieldPosition)
- Specified by:
-
formatin classNumberFormat - Parameters:
-
number- the long number to format -
result- where the text is to be appended -
fieldPosition- keeps track on the position of the field within the returned string. For example, to format a number123456789in theUS locale, if the givenfieldPositionisNumberFormat.INTEGER_FIELD, the begin index and end index offieldPositionwill be set to 0 and 3, respectively for the output string123M. Similarly, positions of the prefix and the suffix fields can be obtained usingNumberFormat.Field.PREFIXandNumberFormat.Field.SUFFIXrespectively. - Returns:
- the
StringBufferpassed in asresult - Throws:
-
NullPointerException- ifresultorfieldPositionisnull -
ArithmeticException- if rounding is needed with rounding mode being set toRoundingMode.UNNECESSARY - See Also:
formatToCharacterIterator
public AttributedCharacterIterator formatToCharacterIterator(Object obj)
AttributedCharacterIterator. The returned AttributedCharacterIterator can be used to build the resulting string, as well as to determine information about the resulting string. Each attribute key of the AttributedCharacterIterator will be of type NumberFormat.Field, with the attribute value being the same as the attribute key. The prefix and the suffix parts of the returned iterator (if present) are represented by the attributes NumberFormat.Field.PREFIX and NumberFormat.Field.SUFFIX respectively.
- Overrides:
-
formatToCharacterIteratorin classFormat - Parameters:
-
obj- The object to format - Returns:
- an
AttributedCharacterIteratordescribing the formatted value - Throws:
-
NullPointerException- if obj is null -
IllegalArgumentException- when the Format cannot format the given object -
ArithmeticException- if rounding is needed with rounding mode being set toRoundingMode.UNNECESSARY
parse
public Number parse(String text, ParsePosition pos)
Number. This method attempts to parse text starting at the index given by the ParsePosition. If parsing succeeds, then the index of the
ParsePosition is 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 updated
ParsePosition can be used to indicate the starting point for the next call to this method. If an error occurs, then the index of the ParsePosition is not changed, the error index of the ParsePosition is set to the index of the character where the error occurred, and null is 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.
The returned value is the numeric part in the given text multiplied by the numeric equivalent of the affix attached (For example, "K" = 1000 in US locale).
A CompactNumberFormat can match the default prefix/suffix to a compact prefix/suffix interchangeably.
Parsing can be done in either a strict or lenient manner, by default it is lenient.
Parsing fails when lenient, if the prefix and/or suffix are non-empty and cannot be found due to parsing ending early, or the first character after the prefix cannot be parsed.
Parsing fails when strict, if in text,
- The default or a compact prefix is not found. For example, the
Locale.UScurrency format prefix: "$" - The default or a compact suffix is not found. For example, a
Locale.USNumberFormat.Style.SHORTcompact suffix: "K" -
isGroupingUsed()returnsfalse, and the grouping symbol is found -
isGroupingUsed()returnstrue, andgetGroupingSize()is not adhered to -
isParseIntegerOnly()returnstrue, and the decimal separator is found -
isGroupingUsed()returnstrueandisParseIntegerOnly()returnsfalse, and the grouping symbol occurs after the decimal separator - Any other characters are found, that are not the expected symbols, and are not digits that occur within the numerical portion
The subclass returned depends on the value of isParseBigDecimal().
- If
isParseBigDecimal()is false (the default), most integer values are returned asLongobjects, no matter how they are written:"17K"and"17.000K"both parse toLong.valueOf(17000). If the value cannot fit intoLong, then the result is returned asDouble. This includes values with a fractional part, infinite values,NaN, and the value -0.0.Callers may use the
NumbermethodsdoubleValue,longValue, etc., to obtain the type they want. - If
isParseBigDecimal()is true, values are returned asBigDecimalobjects. The special cases negative and positive infinity and NaN are returned asDoubleinstances holding the values of the correspondingDoubleconstants.
CompactNumberFormat parses all Unicode characters that represent decimal digits, as defined by Character.digit(). In addition, CompactNumberFormat also recognizes as digits the ten consecutive characters starting with the localized zero digit defined in the DecimalFormatSymbols object.
CompactNumberFormat parse does not allow parsing scientific notations. For example, parsing a string "1.05E4K" in US locale breaks at character 'E' and returns 1.05.
- Specified by:
-
parsein classNumberFormat - Parameters:
-
text- the string to be parsed -
pos- aParsePositionobject with index and error index information as described above - Returns:
- the parsed value, or
nullif the parse fails - Throws:
-
NullPointerException- iftextorposis null - See Also:
setMaximumIntegerDigits
public void setMaximumIntegerDigits(int newValue)
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. Negative input values are replaced with 0. The maximum allowed integer range is 309, if the newValue > 309, then the maximum integer digits count is set to 309.
- Overrides:
-
setMaximumIntegerDigitsin classNumberFormat - Parameters:
-
newValue- the maximum number of integer digits to be shown. - See Also:
setMinimumIntegerDigits
public void setMinimumIntegerDigits(int newValue)
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. Negative input values are replaced with 0. The maximum allowed integer range is 309, if the newValue > 309, then the minimum integer digits count is set to 309.
- Overrides:
-
setMinimumIntegerDigitsin classNumberFormat - Parameters:
-
newValue- the minimum number of integer digits to be shown. - See Also:
setMinimumFractionDigits
public void setMinimumFractionDigits(int newValue)
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. Negative input values are replaced with 0. The maximum allowed fraction range is 340, if the newValue > 340, then the minimum fraction digits count is set to 340.
- Overrides:
-
setMinimumFractionDigitsin classNumberFormat - Parameters:
-
newValue- the minimum number of fraction digits to be shown. - See Also:
setMaximumFractionDigits
public void setMaximumFractionDigits(int newValue)
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. Negative input values are replaced with 0. The maximum allowed fraction range is 340, if the newValue > 340, then the maximum fraction digits count is set to 340.
- Overrides:
-
setMaximumFractionDigitsin classNumberFormat - Parameters:
-
newValue- the maximum number of fraction digits to be shown. - See Also:
getRoundingMode
public RoundingMode getRoundingMode()
RoundingMode used in this CompactNumberFormat.- Overrides:
-
getRoundingModein classNumberFormat - Returns:
- the
RoundingModeused for thisCompactNumberFormat - See Also:
setRoundingMode
public void setRoundingMode(RoundingMode roundingMode)
RoundingMode used in this CompactNumberFormat.- Overrides:
-
setRoundingModein classNumberFormat - Parameters:
-
roundingMode- theRoundingModeto be used - Throws:
-
NullPointerException- ifroundingModeisnull - See Also:
getGroupingSize
public int getGroupingSize()
"12,347 trillion" for the US locale, the grouping size is 3.- Returns:
- the grouping size
- See Also:
setGroupingSize
public void setGroupingSize(int newValue)
"12,347 trillion" for the US locale, the grouping size is 3. The grouping size must be greater than or equal to zero and less than or equal to 127.- Parameters:
-
newValue- the new grouping size - Throws:
-
IllegalArgumentException- ifnewValueis negative or larger than 127 - See Also:
isGroupingUsed
public boolean isGroupingUsed()
12346567890987654 can be formatted as "12,347 trillion" in the US locale. The grouping separator is locale dependent.- Overrides:
-
isGroupingUsedin classNumberFormat - Returns:
-
trueif grouping is used;falseotherwise - See Also:
setGroupingUsed
public void setGroupingUsed(boolean newValue)
- Overrides:
-
setGroupingUsedin classNumberFormat - Parameters:
-
newValue-trueif grouping is used;falseotherwise - See Also:
isParseIntegerOnly
public boolean isParseIntegerOnly()
US locale, if this method returns true, the string "1234.78 thousand" would be parsed as the value 1234000 (1234 (integer part) * 1000 (thousand)) and the fractional part would be skipped. The exact format accepted by the parse operation is locale dependent.- Overrides:
-
isParseIntegerOnlyin classNumberFormat - Implementation Requirements:
- This implementation does not set the
ParsePositionindex to the position of the decimal symbol, but rather the end of the string. - Returns:
-
trueif compact numbers should be parsed as integers only;falseotherwise
setParseIntegerOnly
public void setParseIntegerOnly(boolean value)
- Overrides:
-
setParseIntegerOnlyin classNumberFormat - Parameters:
-
value-trueif compact numbers should be parsed as integers only;falseotherwise - See Also:
isStrict
public boolean isStrict()
true if this format will parse numbers strictly; false otherwise.- Overrides:
-
isStrictin classNumberFormat - Returns:
-
trueif this format will parse numbers strictly;falseotherwise - Since:
- 23
- See Also:
setStrict
public void setStrict(boolean strict)
- Overrides:
-
setStrictin classNumberFormat - Parameters:
-
strict-trueif parsing should be done strictly;falseotherwise - Since:
- 23
- See Also:
isParseBigDecimal
public boolean isParseBigDecimal()
parse(String, ParsePosition) method returns BigDecimal. The default value is false.- Returns:
-
trueif the parse method returns BigDecimal;falseotherwise - See Also:
setParseBigDecimal
public void setParseBigDecimal(boolean newValue)
parse(String, ParsePosition) method returns BigDecimal.- Parameters:
-
newValue-trueif the parse method returns BigDecimal;falseotherwise - See Also:
equals
public boolean equals(Object obj)
CompactNumberFormat for equality. Returns true if the object is also a CompactNumberFormat and the two formats would format any value the same.- Overrides:
-
equalsin classNumberFormat - 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- the object to compare with - Returns:
- true if this is equal to the other
CompactNumberFormat - See Also:
hashCode
public int hashCode()
CompactNumberFormat.- Overrides:
-
hashCodein classNumberFormat - Implementation Requirements:
- Non-transient instance fields of this class are used to calculate a hash code value which adheres to the contract defined in
Objects.hashCode(Object) - Returns:
- the hash code for this
CompactNumberFormat - See Also:
toString
clone
public CompactNumberFormat clone()
CompactNumberFormat instance.- Overrides:
-
clonein classNumberFormat - Returns:
- a clone of this instance
- See Also:
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