Module java.base
Package java.text

Class DecimalFormat

java.lang.Object
java.text.Format
java.text.NumberFormat
java.text.DecimalFormat
All Implemented Interfaces:
Serializable, Cloneable
public class DecimalFormat extends NumberFormat
DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers. It has a variety of features designed to make it possible to parse and format numbers in any locale, including support for Western, Arabic, and Indic digits. It also supports different kinds of numbers, including integers (123), fixed-point numbers (123.4), scientific notation (1.23E4), percentages (12%), and currency amounts ($123). All of these can be localized.

To obtain a NumberFormat for a specific locale, including the default locale, call one of NumberFormat's factory methods, such as getInstance(). In general, do not call the DecimalFormat constructors directly, since the NumberFormat factory methods may return subclasses other than DecimalFormat. If you need to customize the format object, do something like this: 

NumberFormat numFormat = NumberFormat.getInstance(loc);
if (numFormat instanceof DecimalFormat decFormat) {
    decFormat.setDecimalSeparatorAlwaysShown(true);
}

A DecimalFormat comprises a pattern and a set of symbols. The pattern may be set directly using applyPattern(), or indirectly using the API methods. The symbols are stored in a DecimalFormatSymbols object. When using the NumberFormat factory methods, the pattern and symbols are read from localized ResourceBundles.

Patterns

DecimalFormat patterns have the following syntax: 
 Pattern:
         PositivePattern
         PositivePattern ; NegativePattern
 PositivePattern:
         Prefixopt Number Suffixopt
 NegativePattern:
         Prefixopt Number Suffixopt
 Prefix:
         any Unicode characters except U+FFFE, U+FFFF, and special characters
 Suffix:
         any Unicode characters except U+FFFE, U+FFFF, and special characters
 Number:
         Integer Exponentopt
         Integer . Fraction Exponentopt
 Integer:
         MinimumInteger
         #
         # Integer
         # , Integer
 MinimumInteger:
         0
         0 MinimumInteger
         0 , MinimumInteger
 Fraction:
         MinimumFractionopt OptionalFractionopt
 MinimumFraction:
         0 MinimumFractionopt
 OptionalFraction:
         # OptionalFractionopt
 Exponent:
         E MinimumExponent
 MinimumExponent:
         0 MinimumExponentopt

A DecimalFormat pattern contains a positive and negative subpattern, for example, "#,##0.00;(#,##0.00)". Each subpattern has a prefix, numeric part, 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, "0.00" alone is equivalent to "0.00;-0.00". If there is an explicit negative subpattern, it serves only to specify the negative prefix and suffix; the number of digits, minimal digits, and other characteristics are all the same as the positive pattern. That means that "#,##0.0#;(#)" produces precisely the same behavior as "#,##0.0#;(#,##0.0#)".

The prefixes, suffixes, and various symbols used for infinity, digits, grouping separators, decimal separators, etc. may be set to arbitrary values, and they will appear properly during formatting. However, care must be taken that the symbols and strings do not conflict, or parsing will be unreliable. For example, either the positive and negative prefixes or the suffixes must be distinct for DecimalFormat.parse() to be able to distinguish positive from negative values. (If they are identical, then DecimalFormat will behave as if no negative subpattern was specified.) Another example is that the decimal separator and grouping separator should be distinct characters, or parsing will be impossible.

The grouping separator is commonly used for thousands, but in some countries it separates ten-thousands. The grouping size is a constant number of digits between the grouping characters, such as 3 for 100,000,000 or 4 for 1,0000,0000. If you supply a pattern with multiple grouping characters, the interval between the last one and the end of the integer is the one that is used. So "#,##,###,####" == "######,####" == "##,####,####".

Special Pattern Characters

Many characters in a 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. They must be quoted, unless noted otherwise, if they are to appear in the prefix or suffix as literals.

The characters listed here are used in non-localized patterns. Localized patterns use the corresponding characters taken from this formatter's DecimalFormatSymbols object instead, and these characters lose their special status. Two exceptions are the currency sign and quote, which are not localized.

Chart showing symbol, location, localized, and meaning.
Symbol Location Localized? Meaning
0 Number Yes Digit
# Number Yes Digit, zero shows as absent
. Number Yes Decimal separator or monetary decimal separator
- Number Yes Minus sign
, Number Yes Grouping separator or monetary grouping separator
E Number Yes Separates mantissa and exponent in scientific notation. Need not be quoted in prefix or suffix.
; Subpattern boundary Yes Separates positive and negative subpatterns
% Prefix or suffix Yes Multiply by 100 and show as percentage
U+2030 Prefix or suffix Yes Multiply by 1000 and show as per mille value
¤ (U+00A4) Prefix or suffix No Currency sign, replaced by currency symbol. If doubled, replaced by international currency symbol. If present in a pattern, the monetary decimal/grouping separators are used instead of the decimal/grouping separators.
' Prefix or suffix No Used to quote special characters in a prefix or suffix, for example, "'#'#" formats 123 to "#123". To create a single quote itself, use two in a row: "# o''clock".

Scientific Notation

Numbers in scientific notation are expressed as the product of a mantissa and a power of ten, for example, 1234 can be expressed as 1.234 x 10^3. The mantissa is often in the range 1.0 ≤ x < 10.0, but it need not be. DecimalFormat can be instructed to format and parse scientific notation only via a pattern; there is currently no factory method that creates a scientific notation format. In a pattern, the exponent character immediately followed by one or more digit characters indicates scientific notation. Example: "0.###E0" formats the number 1234 as "1.234E3".

  • The number of digit characters after the exponent character gives the minimum exponent digit count. There is no maximum. Negative exponents are formatted using the localized minus sign, not the prefix and suffix from the pattern. This allows patterns such as "0.###E0 m/s".
  • The maximum integer digits is the sum of '0's and '#'s prior to the decimal point. The minimum integer digits is the sum of the '0's prior to the decimal point. The maximum fraction and minimum fraction digits follow the same rules, but apply to the digits after the decimal point but before the exponent. For example, the following pattern: "#00.0####E0" would have a minimum number of integer digits = 2("00") and a maximum number of integer digits = 3("#00"). It would have a minimum number of fraction digits = 1("0") and a maximum number of fraction digits= 5("0####").
  • The minimum and maximum number of integer digits are interpreted together:
    • If the maximum number of integer digits is greater than their minimum number and greater than 1, it forces the exponent to be a multiple of the maximum number of integer digits, and the minimum number of integer digits to be interpreted as 1. The most common use of this is to generate engineering notation, in which the exponent is a multiple of three, e.g., "##0.#####E0". Using this pattern, the number 12345 formats to "12.345E3", and 123456 formats to "123.456E3".
    • Otherwise, the minimum number of integer digits is achieved by adjusting the exponent. Example: 0.00123 formatted with "00.###E0" yields "12.3E-4".
  • For a given number, the amount of significant digits in the mantissa can be calculated as such 
     Mantissa Digits:
         min(max(Minimum Pattern Digits, Original Number Digits), Maximum Pattern Digits)
 Minimum pattern Digits:
         Minimum Integer Digits + Minimum Fraction Digits
 Maximum pattern Digits:
         Maximum Integer Digits + Maximum Fraction Digits
 Original Number Digits:
         The amount of significant digits in the number to be formatted
    This means that generally, a mantissa will have up to the combined maximum integer and fraction digits, if the original number itself has enough significant digits. However, if there are more minimum pattern digits than significant digits in the original number, the mantissa will have significant digits that equals the combined minimum integer and fraction digits. The number of significant digits does not affect parsing.

    It should be noted, that the integer portion of the mantissa will give any excess digits to the fraction portion, whether it be for precision or for satisfying the total amount of combined minimum digits.

    This behavior can be observed in the following example, 

        DecimalFormat df = new DecimalFormat("#000.000##E0");
    df.format(12); // returns "12.0000E0"
    df.format(123456789) // returns "1.23456789E8"
  • Exponential patterns may not contain grouping separators.

Rounding

DecimalFormat provides rounding modes defined in RoundingMode for formatting. By default, it uses RoundingMode.HALF_EVEN.

Digits

For formatting, DecimalFormat uses the ten consecutive characters starting with the localized zero digit defined in the DecimalFormatSymbols object as digits. For parsing, these digits as well as all Unicode decimal digits, as defined by Character.digit, are recognized.

Special Values

Not a Number(NaN) is formatted as a string, which typically has a single character U+FFFD. This string is determined by the DecimalFormatSymbols object. This is the only value for which the prefixes and suffixes are not used.

Infinity is formatted as a string, which typically has a single character U+221E, with the positive or negative prefixes and suffixes applied. The infinity string is determined by the DecimalFormatSymbols object.

Negative zero ("-0") parses to

  • BigDecimal(0) if isParseBigDecimal() is true,
  • Long(0) if isParseBigDecimal() is false and isParseIntegerOnly() is true,
  • Double(-0.0) if both isParseBigDecimal() and isParseIntegerOnly() are false.

Synchronization

Decimal 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.

Example

// Print out a number using the localized number, integer, currency,
// and percent format for each locale
Locale[] locales = NumberFormat.getAvailableLocales();
double myNumber = -1234.56;
NumberFormat form;
for (int j = 0; j < 4; ++j) {
    System.out.println("FORMAT");
    for (Locale locale : locales) {
        if (locale.getCountry().length() == 0) {
            continue; // Skip language-only locales
        }
        System.out.print(locale.getDisplayName());
        form = switch (j) {
            case 0 -> NumberFormat.getInstance(locale);
            case 1 -> NumberFormat.getIntegerInstance(locale);
            case 2 -> NumberFormat.getCurrencyInstance(locale);
            default -> NumberFormat.getPercentInstance(locale);
        };
        if (form instanceof DecimalFormat decForm) {
            System.out.print(": " + decForm.toPattern());
        }
        System.out.print(" -> " + form.format(myNumber));
        try {
            System.out.println(" -> " + form.parse(form.format(myNumber)));
        } catch (ParseException e) {}
    }
}
Since:
1.1
See Also:

  • Constructor Details

  • Method Details

    • format

      public final StringBuffer format(Object number, StringBuffer toAppendTo, FieldPosition pos)
      Formats a number and appends the resulting text to the given string buffer. The number can be of any subclass of Number.

      This implementation uses the maximum precision permitted.

      Overrides:
      format in class NumberFormat
      Parameters:
      number - the 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 1234567.89 in Locale.US locale, if the given fieldPosition is NumberFormat.INTEGER_FIELD, the begin index and end index of fieldPosition will 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 number is null or not an instance of Number.
      NullPointerException - if toAppendTo or pos is null
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • format

      public StringBuffer format(double number, StringBuffer result, FieldPosition fieldPosition)
      Formats a double to produce a string.
      Specified by:
      format in class NumberFormat
      Parameters:
      number - The double 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, for formatting a number 1234567.89 in Locale.US locale, if the given fieldPosition is NumberFormat.INTEGER_FIELD, the begin index and end index of fieldPosition will be set to 0 and 9, respectively for the output string 1,234,567.89.
      Returns:
      The formatted number string
      Throws:
      NullPointerException - if result or fieldPosition is null
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • format

      public StringBuffer format(long number, StringBuffer result, FieldPosition fieldPosition)
      Format a long to produce a string.
      Specified by:
      format in class NumberFormat
      Parameters:
      number - The long 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, for formatting a number 123456789 in Locale.US locale, if the given fieldPosition is NumberFormat.INTEGER_FIELD, the begin index and end index of fieldPosition will be set to 0 and 11, respectively for the output string 123,456,789.
      Returns:
      The formatted number string
      Throws:
      NullPointerException - if result or fieldPosition is null
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • formatToCharacterIterator

      public AttributedCharacterIterator formatToCharacterIterator(Object obj)
      Formats an Object producing an AttributedCharacterIterator. You can use the returned AttributedCharacterIterator 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.

      Overrides:
      formatToCharacterIterator in class Format
      Parameters:
      obj - The object to format
      Returns:
      AttributedCharacterIterator describing 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 to RoundingMode.UNNECESSARY
      Since:
      1.4

    • parse

      public Number parse(String text, ParsePosition pos)
      Parses text from a string to produce a Number.

      The method attempts to parse text starting at the index given by pos. If parsing succeeds, then the index of pos 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 pos can be used to indicate the starting point for the next call to this method. If an error occurs, then the index of pos is not changed, the error index of pos is set to the index of the character where the error occurred, and null is returned.

      The subclass returned depends on the value of isParseBigDecimal() as well as on the string being parsed.

      • If isParseBigDecimal() is false (the default), most integer values are returned as Long objects, no matter how they are written: "17" and "17.000" both parse to Long(17). Values that cannot fit into a Long are returned as Doubles. This includes values with a fractional part, infinite values, NaN, and the value -0.0. DecimalFormat does not decide whether to return a Double or a Long based on the presence of a decimal separator in the source string. Doing so would prevent integers that overflow the mantissa of a double, such as "-9,223,372,036,854,775,808.00", from being parsed accurately.

        Callers may use the Number methods doubleValue, longValue, etc., to obtain the type they want.

      • If isParseBigDecimal() is true, values are returned as BigDecimal objects. The values are the ones constructed by BigDecimal(String) for corresponding strings in locale-independent format. The special cases negative and positive infinity and NaN are returned as Double instances holding the values of the corresponding Double constants.

      DecimalFormat parses all Unicode characters that represent decimal digits, as defined by Character.digit(). In addition, DecimalFormat also recognizes as digits the ten consecutive characters starting with the localized zero digit defined in the DecimalFormatSymbols object.

      Specified by:
      parse in class NumberFormat
      Parameters:
      text - the string to be parsed
      pos - A ParsePosition object with index and error index information as described above.
      Returns:
      the parsed value, or null if the parse fails
      Throws:
      NullPointerException - if text or pos is null.
      See Also:

    • getDecimalFormatSymbols

      public DecimalFormatSymbols getDecimalFormatSymbols()
      Returns a copy of the decimal format symbols, which is generally not changed by the programmer or user.
      Returns:
      a copy of the desired DecimalFormatSymbols
      See Also:

    • setDecimalFormatSymbols

      public void setDecimalFormatSymbols(DecimalFormatSymbols newSymbols)
      Sets the decimal format symbols, which is generally not changed by the programmer or user.
      Parameters:
      newSymbols - desired DecimalFormatSymbols
      See Also:

    • getPositivePrefix

      public String getPositivePrefix()
      Get the positive prefix.

      Examples: +123, $123, sFr123

      Returns:
      the positive prefix

    • setPositivePrefix

      public void setPositivePrefix(String newValue)
      Set the positive prefix.

      Examples: +123, $123, sFr123

      Parameters:
      newValue - the new positive prefix

    • getNegativePrefix

      public String getNegativePrefix()
      Get the negative prefix.

      Examples: -123, ($123) (with negative suffix), sFr-123

      Returns:
      the negative prefix

    • setNegativePrefix

      public void setNegativePrefix(String newValue)
      Set the negative prefix.

      Examples: -123, ($123) (with negative suffix), sFr-123

      Parameters:
      newValue - the new negative prefix

    • getPositiveSuffix

      public String getPositiveSuffix()
      Get the positive suffix.

      Example: 123%

      Returns:
      the positive suffix

    • setPositiveSuffix

      public void setPositiveSuffix(String newValue)
      Set the positive suffix.

      Example: 123%

      Parameters:
      newValue - the new positive suffix

    • getNegativeSuffix

      public String getNegativeSuffix()
      Get the negative suffix.

      Examples: -123%, ($123) (with positive suffixes)

      Returns:
      the negative suffix

    • setNegativeSuffix

      public void setNegativeSuffix(String newValue)
      Set the negative suffix.

      Examples: 123%

      Parameters:
      newValue - the new negative suffix

    • getMultiplier

      public int getMultiplier()
      Gets the multiplier for use in percent, per mille, and similar formats.
      Returns:
      the multiplier
      See Also:

    • setMultiplier

      public void setMultiplier(int newValue)
      Sets the multiplier for use in percent, per mille, and similar formats. For a percent format, set the multiplier to 100 and the suffixes to have '%' (for Arabic, use the Arabic percent sign). For a per mille format, set the multiplier to 1000 and the suffixes to have 'U+2030'.

      Example: with multiplier 100, 1.23 is formatted as "123", and "123" is parsed into 1.23.

      Parameters:
      newValue - the new multiplier
      See Also:

    • getGroupingSize

      public int getGroupingSize()
      Return the grouping size. Grouping size is the number of digits between grouping separators in the integer portion of a number. For example, in the number "123,456.78", the grouping size is 3. Grouping size of zero designates that grouping is not used, which provides the same formatting as if calling setGroupingUsed(false).
      Returns:
      the grouping size
      See Also:

    • setGroupingSize

      public void setGroupingSize(int newValue)
      Set the grouping size. Grouping size is the number of digits between grouping separators in the integer portion of a number. For example, in the number "123,456.78", the grouping size is 3. Grouping size of zero designates that grouping is not used, which provides the same formatting as if calling setGroupingUsed(false).

      The value passed in is converted to a byte, which may lose information. Values that are negative or greater than Byte.MAX_VALUE, will throw an IllegalArgumentException.

      Parameters:
      newValue - the new grouping size
      Throws:
      IllegalArgumentException - if newValue is negative or greater than Byte.MAX_VALUE
      See Also:

    • isDecimalSeparatorAlwaysShown

      public boolean isDecimalSeparatorAlwaysShown()
      Allows you to get the behavior of the decimal separator with integers. (The decimal separator will always appear with decimals.)

      Example: Decimal ON: 12345 → 12345.; OFF: 12345 → 12345

      Returns:
      true if the decimal separator is always shown; false otherwise

    • setDecimalSeparatorAlwaysShown

      public void setDecimalSeparatorAlwaysShown(boolean newValue)
      Allows you to set the behavior of the decimal separator with integers. (The decimal separator will always appear with decimals.)

      Example: Decimal ON: 12345 → 12345.; OFF: 12345 → 12345

      Parameters:
      newValue - true if the decimal separator is always shown; false otherwise

    • isParseBigDecimal

      public boolean isParseBigDecimal()
      Returns whether the parse(java.lang.String, java.text.ParsePosition) method returns BigDecimal. The default value is false.
      Returns:
      true if the parse method returns BigDecimal; false otherwise
      Since:
      1.5
      See Also:

    • setParseBigDecimal

      public void setParseBigDecimal(boolean newValue)
      Sets whether the parse(java.lang.String, java.text.ParsePosition) method returns BigDecimal.
      Parameters:
      newValue - true if the parse method returns BigDecimal; false otherwise
      Since:
      1.5
      See Also:

    • clone

      public Object clone()
      Standard override; no change in semantics.
      Overrides:
      clone in class NumberFormat
      Returns:
      a clone of this instance.
      See Also:

    • equals

      public boolean equals(Object obj)
      Overrides equals
      Overrides:
      equals in class NumberFormat
      Parameters:
      obj - the reference object with which to compare.
      Returns:
      true if this object is the same as the obj argument; false otherwise.
      See Also:

    • hashCode

      public int hashCode()
      Overrides hashCode
      Overrides:
      hashCode in class NumberFormat
      Returns:
      a hash code value for this object.
      See Also:

    • toPattern

      public String toPattern()
      Synthesizes a pattern string that represents the current state of this Format object.
      Returns:
      a pattern string
      See Also:

    • toLocalizedPattern

      public String toLocalizedPattern()
      Synthesizes a localized pattern string that represents the current state of this Format object.
      Returns:
      a localized pattern string
      See Also:

    • applyPattern

      public void applyPattern(String pattern)
      Apply the given pattern to this Format object. A pattern is a short-hand specification for the various formatting properties. These properties can also be changed individually through the various setter methods.

      There is no limit to integer digits set by this routine, since that is the typical end-user desire; use setMaximumInteger if you want to set a real value. For negative numbers, use a second pattern, separated by a semicolon

      Example "#,#00.0#" → 1,234.56

      This means a minimum of 2 integer digits, 1 fraction digit, and a maximum of 2 fraction digits.

      Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.

      In negative patterns, the minimum and maximum counts are ignored; these are presumed to be set in the positive pattern.

      Parameters:
      pattern - a new pattern
      Throws:
      NullPointerException - if pattern is null
      IllegalArgumentException - if the given pattern is invalid.

    • applyLocalizedPattern

      public void applyLocalizedPattern(String pattern)
      Apply the given pattern to this Format object. The pattern is assumed to be in a localized notation. A pattern is a short-hand specification for the various formatting properties. These properties can also be changed individually through the various setter methods.

      There is no limit to integer digits set by this routine, since that is the typical end-user desire; use setMaximumInteger if you want to set a real value. For negative numbers, use a second pattern, separated by a semicolon

      Example "#,#00.0#" → 1,234.56

      This means a minimum of 2 integer digits, 1 fraction digit, and a maximum of 2 fraction digits.

      Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.

      In negative patterns, the minimum and maximum counts are ignored; these are presumed to be set in the positive pattern.

      Parameters:
      pattern - a new pattern
      Throws:
      NullPointerException - if pattern is null
      IllegalArgumentException - if the given pattern is invalid.

    • setMaximumIntegerDigits

      public void setMaximumIntegerDigits(int newValue)
      Sets the maximum number of digits allowed in the integer portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of newValue and 309 is used. Negative input values are replaced with 0.
      Overrides:
      setMaximumIntegerDigits in class NumberFormat
      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:

    • setMinimumIntegerDigits

      public void setMinimumIntegerDigits(int newValue)
      Sets the minimum number of digits allowed in the integer portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of newValue and 309 is used. Negative input values are replaced with 0.
      Overrides:
      setMinimumIntegerDigits in class NumberFormat
      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:

    • setMaximumFractionDigits

      public void setMaximumFractionDigits(int newValue)
      Sets the maximum number of digits allowed in the fraction portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of newValue and 340 is used. Negative input values are replaced with 0.
      Overrides:
      setMaximumFractionDigits in class NumberFormat
      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:

    • setMinimumFractionDigits

      public void setMinimumFractionDigits(int newValue)
      Sets the minimum number of digits allowed in the fraction portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of newValue and 340 is used. Negative input values are replaced with 0.
      Overrides:
      setMinimumFractionDigits in class NumberFormat
      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:

    • getMaximumIntegerDigits

      public int getMaximumIntegerDigits()
      Gets the maximum number of digits allowed in the integer portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of the return value and 309 is used.
      Overrides:
      getMaximumIntegerDigits in class NumberFormat
      Returns:
      the maximum number of digits
      See Also:

    • getMinimumIntegerDigits

      public int getMinimumIntegerDigits()
      Gets the minimum number of digits allowed in the integer portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of the return value and 309 is used.
      Overrides:
      getMinimumIntegerDigits in class NumberFormat
      Returns:
      the minimum number of digits
      See Also:

    • getMaximumFractionDigits

      public int getMaximumFractionDigits()
      Gets the maximum number of digits allowed in the fraction portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of the return value and 340 is used.
      Overrides:
      getMaximumFractionDigits in class NumberFormat
      Returns:
      the maximum number of digits.
      See Also:

    • getMinimumFractionDigits

      public int getMinimumFractionDigits()
      Gets the minimum number of digits allowed in the fraction portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of the return value and 340 is used.
      Overrides:
      getMinimumFractionDigits in class NumberFormat
      Returns:
      the minimum number of digits
      See Also:

    • getCurrency

      public Currency getCurrency()
      Gets the currency used by this decimal format when formatting currency values. The currency is obtained by calling DecimalFormatSymbols.getCurrency on this number format's symbols.
      Overrides:
      getCurrency in class NumberFormat
      Returns:
      the currency used by this decimal format, or null
      Since:
      1.4

    • setCurrency

      public void setCurrency(Currency currency)
      Sets 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. The currency is set by calling DecimalFormatSymbols.setCurrency on this number format's symbols.
      Overrides:
      setCurrency in class NumberFormat
      Parameters:
      currency - the new currency to be used by this decimal format
      Throws:
      NullPointerException - if currency is null
      Since:
      1.4

    • getRoundingMode

      public RoundingMode getRoundingMode()
      Gets the RoundingMode used in this DecimalFormat.
      Overrides:
      getRoundingMode in class NumberFormat
      Returns:
      The RoundingMode used for this DecimalFormat.
      Since:
      1.6
      See Also:

    • setRoundingMode

      public void setRoundingMode(RoundingMode roundingMode)
      Sets the RoundingMode used in this DecimalFormat.
      Overrides:
      setRoundingMode in class NumberFormat
      Parameters:
      roundingMode - The RoundingMode to be used
      Throws:
      NullPointerException - if roundingMode is null.
      Since:
      1.6
      See Also: