Added in API level 1

DecimalFormat

open class DecimalFormat : NumberFormat

kotlin.Any
↳	java.text.Format
	↳	java.text.NumberFormat
		↳	java.text.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 f = NumberFormat.getInstance(loc);
  if (f instanceof DecimalFormat) {
      ((DecimalFormat) f).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:

<i>Pattern:</i><i>PositivePattern</i><i>PositivePattern</i>; <i>NegativePattern</i><i>PositivePattern:</i><i>Prefix<sub>opt</sub></i><i>Number</i><i>Suffix<sub>opt</sub></i><i>NegativePattern:</i><i>Prefix<sub>opt</sub></i><i>Number</i><i>Suffix<sub>opt</sub></i><i>Prefix:</i>any Unicode characters except \uFFFE, \uFFFF, and special characters
  <i>Suffix:</i>any Unicode characters except \uFFFE, \uFFFF, and special characters
  <i>Number:</i><i>Integer</i><i>Exponent<sub>opt</sub></i><i>Integer</i>. <i>Fraction</i><i>Exponent<sub>opt</sub></i><i>Integer:</i><i>MinimumInteger</i>
          # <i>Integer</i> , <i>Integer</i><i>MinimumInteger:</i>0
          0 <i>MinimumInteger</i>0 , <i>MinimumInteger</i><i>Fraction:</i><i>MinimumFraction<sub>opt</sub></i><i>OptionalFraction<sub>opt</sub></i><i>MinimumFraction:</i>0 <i>MinimumFraction<sub>opt</sub></i><i>OptionalFraction:</i> <i>OptionalFraction<sub>opt</sub></i><i>Exponent:</i>E <i>MinimumExponent</i><i>MinimumExponent:</i>0 <i>MinimumExponent<sub>opt</sub></i>

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
`\u2030`	Prefix or suffix	Yes	Multiply by 1000 and show as per mille value
`¤` (`\u00A4`)	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 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".
The number of significant digits in the mantissa is the sum of the minimum integer and maximum fraction digits, and is unaffected by the maximum integer digits. For example, 12345 formatted with "##0.##E0" is "12.3E3". To show all digits, set the significant digits count to zero. The number of significant digits does not affect parsing.
Exponential patterns may not contain grouping separators.

Rounding

DecimalFormat provides rounding modes defined in java.math.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 java.lang.Character#digit, are recognized.

Special Values

NaN is formatted as a string, which typically has a single character \uFFFD. 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 \u221E, 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

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

Summary

Inherited constants

From class NumberFormat

Int

FRACTION_FIELD

Field constant used to construct a FieldPosition object. Signifies that the position of the fraction part of a formatted number should be returned.

Int

INTEGER_FIELD

Field constant used to construct a FieldPosition object. Signifies that the position of the integer part of a formatted number should be returned.

Public constructors
`DecimalFormat()` Creates a DecimalFormat using the default pattern and symbols for the default `FORMAT` locale.
`DecimalFormat(pattern: String!)` Creates a DecimalFormat using the given pattern and the symbols for the default `FORMAT` locale.
`DecimalFormat(pattern: String!, symbols: DecimalFormatSymbols!)` Creates a DecimalFormat using the given pattern and symbols.

Public methods
open Unit	`applyLocalizedPattern(pattern: String!)` Apply the given pattern to this Format object.
open Unit	`applyPattern(pattern: String!)` Apply the given pattern to this Format object.
open Any	`clone()` Standard override; no change in semantics.
open Boolean	`equals(other: Any?)` Overrides equals
StringBuffer	`format(number: Any, toAppendTo: StringBuffer, pos: FieldPosition)` Formats a number and appends the resulting text to the given string buffer.
open StringBuffer	`format(number: Double, result: StringBuffer, fieldPosition: FieldPosition)` Formats a double to produce a string.
open StringBuffer	`format(number: Long, result: StringBuffer, fieldPosition: FieldPosition)` Format a long to produce a string.
open AttributedCharacterIterator!	`formatToCharacterIterator(obj: Any!)` Formats an Object producing an `AttributedCharacterIterator`.
open Currency?	`getCurrency()` Gets the currency used by this decimal format when formatting currency values.
open DecimalFormatSymbols!	`getDecimalFormatSymbols()` Returns a copy of the decimal format symbols, which is generally not changed by the programmer or user.
open Int	`getGroupingSize()` Return the grouping size.
open Int	`getMaximumFractionDigits()` Gets the maximum number of digits allowed in the fraction portion of a number.
open Int	`getMaximumIntegerDigits()` Gets the maximum number of digits allowed in the integer portion of a number.
open Int	`getMinimumFractionDigits()` Gets the minimum number of digits allowed in the fraction portion of a number.
open Int	`getMinimumIntegerDigits()` Gets the minimum number of digits allowed in the integer portion of a number.
open Int	`getMultiplier()` Gets the multiplier for use in percent, per mille, and similar formats.
open String!	`getNegativePrefix()` Get the negative prefix.
open String!	`getNegativeSuffix()` Get the negative suffix.
open String!	`getPositivePrefix()` Get the positive prefix.
open String!	`getPositiveSuffix()` Get the positive suffix.
open RoundingMode	`getRoundingMode()` Gets the `java.math.RoundingMode` used in this DecimalFormat.
open Int	`hashCode()` Overrides hashCode
open Boolean	`isDecimalSeparatorAlwaysShown()` Allows you to get the behavior of the decimal separator with integers.
open Boolean	`isGroupingUsed()` Returns true if grouping is used in this format.
open Boolean	`isParseBigDecimal()` Returns whether the `parse(java.lang.String,java.text.ParsePosition)` method returns `BigDecimal`.
open Boolean	`isParseIntegerOnly()` Returns true if this format will parse numbers as integers only.
open Number?	`parse(text: String, pos: ParsePosition)` Parses text from a string to produce a `Number`.
open Unit	`setCurrency(currency: Currency)` Sets the currency used by this number format when formatting currency values.
open Unit	`setDecimalFormatSymbols(newSymbols: DecimalFormatSymbols!)` Sets the decimal format symbols, which is generally not changed by the programmer or user.
open Unit	`setDecimalSeparatorAlwaysShown(newValue: Boolean)` Allows you to set the behavior of the decimal separator with integers.
open Unit	`setGroupingSize(newValue: Int)` Set the grouping size.
open Unit	`setGroupingUsed(newValue: Boolean)` Set whether or not grouping will be used in this format.
open Unit	`setMaximumFractionDigits(newValue: Int)` Sets the maximum number of digits allowed in the fraction portion of a number.
open Unit	`setMaximumIntegerDigits(newValue: Int)` Sets the maximum number of digits allowed in the integer portion of a number.
open Unit	`setMinimumFractionDigits(newValue: Int)` Sets the minimum number of digits allowed in the fraction portion of a number.
open Unit	`setMinimumIntegerDigits(newValue: Int)` Sets the minimum number of digits allowed in the integer portion of a number.
open Unit	`setMultiplier(newValue: Int)` Sets the multiplier for use in percent, per mille, and similar formats.
open Unit	`setNegativePrefix(newValue: String!)` Set the negative prefix.
open Unit	`setNegativeSuffix(newValue: String!)` Set the negative suffix.
open Unit	`setParseBigDecimal(newValue: Boolean)` Sets whether the `parse(java.lang.String,java.text.ParsePosition)` method returns `BigDecimal`.
open Unit	`setParseIntegerOnly(value: Boolean)` Sets whether or not numbers should be parsed as integers only.
open Unit	`setPositivePrefix(newValue: String!)` Set the positive prefix.
open Unit	`setPositiveSuffix(newValue: String!)` Set the positive suffix.
open Unit	`setRoundingMode(roundingMode: RoundingMode?)` Sets the `java.math.RoundingMode` used in this DecimalFormat.
open String!	`toLocalizedPattern()` Synthesizes a localized pattern string that represents the current state of this Format object.
open String!	`toPattern()` Synthesizes a pattern string that represents the current state of this Format object.

Inherited functions

From class NumberFormat

`String`	`format(number: Double)` Specialization of format.
`String`	`format(number: Long)` Specialization of format.
`Array<Locale!>`	`getAvailableLocales()` Returns a scientific format for the current default locale. /public static final NumberFormat getScientificInstance() { return getInstance(Locale.getDefault(Locale.Category.FORMAT), null, SCIENTIFICSTYLE); } /** Returns a scientific format for the specified locale.
`NumberFormat`	`getCurrencyInstance()` Returns a currency format for the current default `FORMAT` locale. This is equivalent to calling `getCurrencyInstance(Locale.getDefault(Locale.Category.FORMAT))`.
`NumberFormat`	`getCurrencyInstance(inLocale: Locale)` Returns 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.
`NumberFormat`	`getInstance()` Returns a general-purpose number format for the current default `FORMAT` locale. This is the same as calling `getNumberInstance()`.
`NumberFormat`	`getInstance(inLocale: Locale)` Returns a general-purpose number format for the specified locale. This is the same as calling `getNumberInstance(inLocale)`.
`NumberFormat`	`getIntegerInstance()` Returns an integer number format for the current default `FORMAT` locale. The returned number format is configured to round floating point numbers to the nearest integer using half-even rounding (see `RoundingMode.HALF_EVEN`) for formatting, and to parse only the integer part of an input string (see `isParseIntegerOnly`). This is equivalent to calling `getIntegerInstance(Locale.getDefault(Locale.Category.FORMAT))`.
`NumberFormat`	`getIntegerInstance(inLocale: Locale)` Returns 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 (see `RoundingMode.HALF_EVEN`) for formatting, and to parse only the integer part of an input string (see `isParseIntegerOnly`).
`NumberFormat`	`getNumberInstance()` Returns a general-purpose number format for the current default `FORMAT` locale. This is equivalent to calling `getNumberInstance(Locale.getDefault(Locale.Category.FORMAT))`.
`NumberFormat`	`getNumberInstance(inLocale: Locale)` Returns a general-purpose number format for the specified locale.
`NumberFormat`	`getPercentInstance()` Returns a percentage format for the current default `FORMAT` locale. This is equivalent to calling `getPercentInstance(Locale.getDefault(Locale.Category.FORMAT))`.
`NumberFormat`	`getPercentInstance(inLocale: Locale)` Returns a percentage format for the specified locale.
`Number?`	`parse(source: String)` Parses text from the beginning of the given string to produce a number. The method may not use the entire text of the given string. See the `parse(java.lang.String,java.text.ParsePosition)` method for more information on number parsing. WARNING: Don't use this method to deserialize a number. The underlying localized number format and parsing behaviors can change across Android versions as common usage in the locale changes. Consider using the parse methods in the boxed types, e.g. `Long#parseLong(String)`, or `java.math.BigDecimal` for deserializing a locale-independent decimal number.
`Any?`	`parseObject(source: String, pos: ParsePosition)` 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. See the `parse(java.lang.String,java.text.ParsePosition)` method for more information on number parsing.

From class Format

String!

format(obj: Any!)

Formats an object to produce a string. This is equivalent to format(obj, new StringBuffer(), new FieldPosition(0)).toString();

AttributedCharacterIterator!

formatToCharacterIterator(obj: Any!)

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 Field. It is up to each Format implementation to define what the legal values are for each attribute in the AttributedCharacterIterator, but typically the attribute key is also used as the attribute value.

The default implementation creates an AttributedCharacterIterator with no attributes. Subclasses that support fields should override this and create an AttributedCharacterIterator with meaningful attributes.

Any!

parseObject(source: String!)

Parses text from the beginning of the given string to produce an object. The method may not use the entire text of the given string.

Public constructors

DecimalFormat

Added in API level 1

DecimalFormat()

Creates a DecimalFormat using the default pattern and symbols for the default FORMAT locale. This is a convenient way to obtain a DecimalFormat when internationalization is not the main concern.

To obtain standard formats for a given locale, use the factory methods on NumberFormat such as getNumberInstance. These factories will return the most appropriate sub-class of NumberFormat for a given locale.

See Also

DecimalFormat

Added in API level 1

DecimalFormat(pattern: String!)

Creates a DecimalFormat using the given pattern and the symbols for the default FORMAT locale. This is a convenient way to obtain a DecimalFormat when internationalization is not the main concern.

Parameters
`pattern`	String!: a non-localized pattern string.

Exceptions
`java.lang.NullPointerException`	if `pattern` is null
`java.lang.IllegalArgumentException`	if the given pattern is invalid.

See Also

DecimalFormat

Added in API level 1

DecimalFormat(
    pattern: String!, 
    symbols: DecimalFormatSymbols!)

Creates a DecimalFormat using the given pattern and symbols. Use this constructor when you need to completely customize the behavior of the format.

To obtain standard formats for a given locale, use the factory methods on NumberFormat such as getInstance or getCurrencyInstance. If you need only minor adjustments to a standard format, you can modify the format returned by a NumberFormat factory method.

Parameters
`pattern`	String!: a non-localized pattern string
`symbols`	DecimalFormatSymbols!: the set of symbols to be used

Exceptions
`java.lang.NullPointerException`	if any of the given arguments is null
`java.lang.IllegalArgumentException`	if the given pattern is invalid

See Also

java.text.DecimalFormatSymbols

Public methods

applyLocalizedPattern

Added in API level 1

open fun applyLocalizedPattern(pattern: String!): Unit

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`	String!: a new pattern

Exceptions
`java.lang.NullPointerException`	if `pattern` is null
`java.lang.IllegalArgumentException`	if the given pattern is invalid.

applyPattern

Added in API level 1

open fun applyPattern(pattern: String!): Unit

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.

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`	String!: a new pattern

Exceptions
`java.lang.NullPointerException`	if `pattern` is null
`java.lang.IllegalArgumentException`	if the given pattern is invalid.

clone

Added in API level 1

open fun clone(): Any

Standard override; no change in semantics.

Return
`Any`	a clone of this instance.

Exceptions
`java.lang.CloneNotSupportedException`	if the object's class does not support the `Cloneable` interface. Subclasses that override the `clone` method can also throw this exception to indicate that an instance cannot be cloned.

equals

Added in API level 1

open fun equals(other: Any?): Boolean

Overrides equals

Parameters
`obj`	the reference object with which to compare.

Return
`Boolean`	`true` if this object is the same as the obj argument; `false` otherwise.

format

Added in API level 1

fun format(
    number: Any, 
    toAppendTo: StringBuffer, 
    pos: FieldPosition
): StringBuffer

Formats a number and appends the resulting text to the given string buffer. The number can be of any subclass of java.lang.Number.

This implementation uses the maximum precision permitted.

Parameters
`obj`	The object to format
`toAppendTo`	StringBuffer: the `StringBuffer` to which the formatted text is to be appended
`pos`	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`.
`number`	Any: the number to format

Return
`StringBuffer`	the value passed in as `toAppendTo`

Exceptions
`java.lang.NullPointerException`	if `toAppendTo` or `pos` is null
`java.lang.IllegalArgumentException`	if `number` is null or not an instance of `Number`.
`java.lang.ArithmeticException`	if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY

See Also

java.text.FieldPosition

format

Added in API level 1

open fun format(
    number: Double, 
    result: StringBuffer, 
    fieldPosition: FieldPosition
): StringBuffer

Formats a double to produce a string.

Parameters
`number`	Double: The double 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`.
`result`	StringBuffer: where the text is to be appended
`fieldPosition`	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`.

Return
`StringBuffer`	The formatted number string

Exceptions
`java.lang.ArithmeticException`	if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
`java.lang.NullPointerException`	if `result` or `fieldPosition` is `null`

See Also

java.text.FieldPosition

format

Added in API level 1

open fun format(
    number: Long, 
    result: StringBuffer, 
    fieldPosition: FieldPosition
): StringBuffer

Format a long to produce a string.

Parameters
`number`	Long: The long 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 `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`.
`result`	StringBuffer: where the text is to be appended
`fieldPosition`	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`.

Return
`StringBuffer`	The formatted number string

Exceptions
`java.lang.ArithmeticException`	if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
`java.lang.NullPointerException`	if `result` or `fieldPosition` is `null`

See Also

java.text.FieldPosition

formatToCharacterIterator

Added in API level 1

open fun formatToCharacterIterator(obj: Any!): AttributedCharacterIterator!

Each attribute key of the AttributedCharacterIterator will be of type NumberFormat.Field, with the attribute value being the same as the attribute key.

Parameters
`obj`	Any!: The object to format

Return
`AttributedCharacterIterator!`	AttributedCharacterIterator describing the formatted value.

Exceptions
`java.lang.NullPointerException`	if obj is null.
`java.lang.IllegalArgumentException`	when the Format cannot format the given object.
`java.lang.ArithmeticException`	if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY

getCurrency

Added in API level 1

open fun getCurrency(): Currency?

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.

Return
`Currency?`	the currency used by this decimal format, or `null`

Exceptions
`java.lang.UnsupportedOperationException`	if the number format class doesn't implement currency formatting

getDecimalFormatSymbols

Added in API level 1

open fun getDecimalFormatSymbols(): DecimalFormatSymbols!

Returns a copy of the decimal format symbols, which is generally not changed by the programmer or user.

Return
`DecimalFormatSymbols!`	a copy of the desired DecimalFormatSymbols

See Also

java.text.DecimalFormatSymbols

getGroupingSize

Added in API level 1

open fun getGroupingSize(): Int

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).

Return
`Int`	the grouping size

See Also

getMaximumFractionDigits

Added in API level 1

open fun getMaximumFractionDigits(): Int

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.

Return
`Int`	the maximum number of digits.

See Also

#setMaximumFractionDigits

getMaximumIntegerDigits

Added in API level 1

open fun getMaximumIntegerDigits(): Int

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.

Return
`Int`	the maximum number of digits

See Also

#setMaximumIntegerDigits

getMinimumFractionDigits

Added in API level 1

open fun getMinimumFractionDigits(): Int

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.

Return
`Int`	the minimum number of digits

See Also

#setMinimumFractionDigits

getMinimumIntegerDigits

Added in API level 1

open fun getMinimumIntegerDigits(): Int

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.

Return
`Int`	the minimum number of digits

See Also

#setMinimumIntegerDigits

getMultiplier

Added in API level 1

open fun getMultiplier(): Int

Gets the multiplier for use in percent, per mille, and similar formats.

Return
`Int`	the multiplier

See Also

#setMultiplier(int)

getNegativePrefix

Added in API level 1

open fun getNegativePrefix(): String!

Get the negative prefix.

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

Return
`String!`	the negative prefix

getNegativeSuffix

Added in API level 1

open fun getNegativeSuffix(): String!

Get the negative suffix.

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

Return
`String!`	the negative suffix

getPositivePrefix

Added in API level 1

open fun getPositivePrefix(): String!

Get the positive prefix.

Examples: +123, $123, sFr123

Return
`String!`	the positive prefix

getPositiveSuffix

Added in API level 1

open fun getPositiveSuffix(): String!

Get the positive suffix.

Example: 123%

Return
`String!`	the positive suffix

getRoundingMode

Added in API level 9

open fun getRoundingMode(): RoundingMode

Gets the java.math.RoundingMode used in this DecimalFormat.

Return
`RoundingMode`	The `RoundingMode` used for this DecimalFormat.

Exceptions
`java.lang.UnsupportedOperationException`	The default implementation always throws this exception

See Also

#setRoundingMode(RoundingMode)

hashCode

Added in API level 1

open fun hashCode(): Int

Overrides hashCode

Return
`Int`	a hash code value for this object.

isDecimalSeparatorAlwaysShown

Added in API level 1

open fun isDecimalSeparatorAlwaysShown(): Boolean

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

Return
`Boolean`	`true` if the decimal separator is always shown; `false` otherwise

isGroupingUsed

Added in API level 1

open fun isGroupingUsed(): Boolean

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.

Return
`Boolean`	`true` if grouping is used; `false` otherwise

isParseBigDecimal

Added in API level 1

open fun isParseBigDecimal(): Boolean

Returns whether the parse(java.lang.String,java.text.ParsePosition) method returns BigDecimal. The default value is false.

Return
`Boolean`	`true` if the parse method returns BigDecimal; `false` otherwise

See Also

#setParseBigDecimal

isParseIntegerOnly

Added in API level 1

open fun isParseIntegerOnly(): Boolean

Returns true if this format will parse numbers as integers only. For example in the English locale, with ParseIntegerOnly true, the string "1234." would be parsed as the integer value 1234 and parsing would stop at the "." character. Of course, the exact format accepted by the parse operation is locale dependent and determined by sub-classes of NumberFormat.

Return
`Boolean`	`true` if numbers should be parsed as integers only; `false` otherwise

parse

Added in API level 1

open fun parse(
    text: String, 
    pos: ParsePosition
): Number?

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 java.math.BigDecimal#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.

Parameters
`source`	the String to parse
`parsePosition`	the parse position
`text`	String: the string to be parsed
`pos`	ParsePosition: A `ParsePosition` object with index and error index information as described above.

Return
`Number?`	the parsed value, or `null` if the parse fails

Exceptions
`java.lang.NullPointerException`	if `text` or `pos` is null.

setCurrency

Added in API level 1

open fun setCurrency(currency: Currency): Unit

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.

Parameters
`currency`	Currency: the new currency to be used by this decimal format

Exceptions
`java.lang.UnsupportedOperationException`	if the number format class doesn't implement currency formatting
`java.lang.NullPointerException`	if `currency` is null

setDecimalFormatSymbols

Added in API level 1

open fun setDecimalFormatSymbols(newSymbols: DecimalFormatSymbols!): Unit

Sets the decimal format symbols, which is generally not changed by the programmer or user.

Parameters
`newSymbols`	DecimalFormatSymbols!: desired DecimalFormatSymbols

See Also

java.text.DecimalFormatSymbols

setDecimalSeparatorAlwaysShown

Added in API level 1

open fun setDecimalSeparatorAlwaysShown(newValue: Boolean): Unit

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

setGroupingSize

Added in API level 1

open fun setGroupingSize(newValue: Int): Unit

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`	Int: the new grouping size

Exceptions
`java.lang.IllegalArgumentException`	if `newValue` is negative or greater than `Byte.MAX_VALUE`

See Also

setGroupingUsed

Added in API level 1

open fun setGroupingUsed(newValue: Boolean): Unit

Set whether or not grouping will be used in this format.

Parameters
`newValue`	Boolean: `true` if grouping is used; `false` otherwise

setMaximumFractionDigits

Added in API level 1

open fun setMaximumFractionDigits(newValue: Int): Unit

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.

Parameters
`newValue`	Int: 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

java.text.NumberFormat#setMaximumFractionDigits

setMaximumIntegerDigits

Added in API level 1

open fun setMaximumIntegerDigits(newValue: Int): Unit

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.

Parameters
`newValue`	Int: 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

java.text.NumberFormat#setMaximumIntegerDigits

setMinimumFractionDigits

Added in API level 1

open fun setMinimumFractionDigits(newValue: Int): Unit

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.

Parameters
`newValue`	Int: 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

java.text.NumberFormat#setMinimumFractionDigits

setMinimumIntegerDigits

Added in API level 1

open fun setMinimumIntegerDigits(newValue: Int): Unit

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.

Parameters
`newValue`	Int: 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

java.text.NumberFormat#setMinimumIntegerDigits

setMultiplier

Added in API level 1

open fun setMultiplier(newValue: Int): Unit

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 '\u2030'.

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

Parameters
`newValue`	Int: the new multiplier

See Also

#getMultiplier

setNegativePrefix

Added in API level 1

open fun setNegativePrefix(newValue: String!): Unit

Set the negative prefix.

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

Parameters
`newValue`	String!: the new negative prefix

setNegativeSuffix

Added in API level 1

open fun setNegativeSuffix(newValue: String!): Unit

Set the negative suffix.

Examples: 123%

Parameters
`newValue`	String!: the new negative suffix

setParseBigDecimal

Added in API level 1

open fun setParseBigDecimal(newValue: Boolean): Unit

Sets whether the parse(java.lang.String,java.text.ParsePosition) method returns BigDecimal.

Parameters
`newValue`	Boolean: `true` if the parse method returns BigDecimal; `false` otherwise

See Also

#isParseBigDecimal

setParseIntegerOnly

Added in API level 1

open fun setParseIntegerOnly(value: Boolean): Unit

Sets whether or not numbers should be parsed as integers only.

Parameters
`value`	Boolean: `true` if numbers should be parsed as integers only; `false` otherwise

setPositivePrefix

Added in API level 1

open fun setPositivePrefix(newValue: String!): Unit

Set the positive prefix.

Examples: +123, $123, sFr123

Parameters
`newValue`	String!: the new positive prefix

setPositiveSuffix

Added in API level 1

open fun setPositiveSuffix(newValue: String!): Unit

Set the positive suffix.

Example: 123%

Parameters
`newValue`	String!: the new positive suffix

setRoundingMode

Added in API level 9

open fun setRoundingMode(roundingMode: RoundingMode?): Unit

Sets the java.math.RoundingMode used in this DecimalFormat.

Parameters
`roundingMode`	RoundingMode?: The `RoundingMode` to be used

Exceptions
`java.lang.UnsupportedOperationException`	The default implementation always throws this exception
`java.lang.NullPointerException`	if `roundingMode` is null.

See Also

#getRoundingMode()

toLocalizedPattern

Added in API level 1

open fun toLocalizedPattern(): String!

Synthesizes a localized pattern string that represents the current state of this Format object.

Return
`String!`	a localized pattern string

See Also

#applyPattern

toPattern

Added in API level 1

open fun toPattern(): String!

Synthesizes a pattern string that represents the current state of this Format object.

Return
`String!`	a pattern string

See Also

#applyPattern