NumberFormat (Java Platform SE 7 )

java.lang.Object
- java.text.Format
- - java.text.NumberFormat

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

ChoiceFormat, DecimalFormat
```
public abstract class NumberFormat
extends Format
```
NumberFormat is the abstract base class for all number formats. This class provides the interface for formatting and parsing numbers. NumberFormat also provides methods for determining which locales have number formats, and what their names are.
NumberFormat helps you to format and parse numbers for any locale. Your code can be completely independent of the locale conventions for decimal points, thousands-separators, or even the particular decimal digits used, or whether the number format is even decimal.
To format a number for the current Locale, use one of the factory class methods:
```
  myString = NumberFormat.getInstance().format(myNumber);
 
```
If you are formatting multiple numbers, it is more efficient to get the format and use it multiple times so that the system doesn't have to fetch the information about the local language and country conventions multiple times.
```
 NumberFormat nf = NumberFormat.getInstance();
 for (int i = 0; i < myNumber.length; ++i) {
     output.println(nf.format(myNumber[i]) + "; ");
 }
 
```
To format a number for a different Locale, specify it in the call to getInstance.
```
 NumberFormat nf = NumberFormat.getInstance(Locale.FRENCH);
 
```
You can also use a NumberFormat to parse numbers:
```
 myNumber = nf.parse(myString);
 
```
Use getInstance or getNumberInstance to get the normal number format. Use getIntegerInstance to get an integer number format. Use getCurrencyInstance to get the currency number format. And use getPercentInstance to get a format for displaying percentages. With this format, a fraction like 0.53 is displayed as 53%.
You can also control the display of numbers with such methods as setMinimumFractionDigits. If you want even more control over the format or parsing, or want to give your users more control, you can try casting the NumberFormat you get from the factory methods to a DecimalFormat. This will work for the vast majority of locales; just remember to put it in a try block in case you encounter an unusual one.
NumberFormat and DecimalFormat are designed such that some controls work for formatting and others work for parsing. The following is the detailed description for each these control methods,
setParseIntegerOnly : only affects parsing, e.g. if true, "3456.78" -> 3456 (and leaves the parse position just after index 6) if false, "3456.78" -> 3456.78 (and leaves the parse position just after index 8) This is independent of formatting. If you want to not show a decimal point where there might be no digits after the decimal point, use setDecimalSeparatorAlwaysShown.
setDecimalSeparatorAlwaysShown : only affects formatting, and only where there might be no digits after the decimal point, such as with a pattern like "#,##0.##", e.g., if true, 3456.00 -> "3,456." if false, 3456.00 -> "3456" This is independent of parsing. If you want parsing to stop at the decimal point, use setParseIntegerOnly.
You can also use forms of the parse and format methods with ParsePosition and FieldPosition to allow you to:
- progressively parse through pieces of a string
- align the decimal point and other areas
For example, you can align numbers in two ways:
1. If you are using a monospaced font with spacing for alignment, you can pass the FieldPosition in your format call, with field = INTEGER_FIELD. On output, getEndIndex will be set to the offset between the last character of the integer and the decimal. Add (desiredSpaceCount - getEndIndex) spaces at the front of the string.
2. If you are using proportional fonts, instead of padding with spaces, measure the width of the string in pixels from the start to getEndIndex. Then move the pen by (desiredPixelWidth - widthToAlignmentPoint) before drawing the text. It also works where there is no decimal, but possibly additional characters at the end, e.g., with parentheses in negative numbers: "(12)" for -12.
Synchronization

Number formats are generally not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.
See Also:
DecimalFormat, ChoiceFormat, Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`NumberFormat.Field` Defines constants that are used as attribute keys in the `AttributedCharacterIterator` returned from `NumberFormat.formatToCharacterIterator` and as field identifiers in `FieldPosition`.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`FRACTION_FIELD` Field constant used to construct a FieldPosition object.
`static int`	`INTEGER_FIELD` Field constant used to construct a FieldPosition object.

Constructor Summary

Constructors
Modifier Constructor and Description

protected NumberFormat()
Sole constructor.

Constructors
Modifier	Constructor and Description
`protected`	`NumberFormat()` Sole constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`Object`	`clone()` Overrides Cloneable
`boolean`	`equals(Object obj)` Overrides equals
`String`	`format(double number)` Specialization of format.
`abstract StringBuffer`	`format(double number, StringBuffer toAppendTo, FieldPosition pos)` Specialization of format.
`String`	`format(long number)` Specialization of format.
`abstract StringBuffer`	`format(long number, StringBuffer toAppendTo, FieldPosition pos)` Specialization of format.
`StringBuffer`	`format(Object number, StringBuffer toAppendTo, FieldPosition pos)` Formats a number and appends the resulting text to the given string buffer.
`static Locale[]`	`getAvailableLocales()` Returns an array of all locales for which the `get*Instance` methods of this class can return localized instances.
`Currency`	`getCurrency()` Gets the currency used by this number format when formatting currency values.
`static NumberFormat`	`getCurrencyInstance()` Returns a currency format for the current default locale.
`static NumberFormat`	`getCurrencyInstance(Locale inLocale)` Returns a currency format for the specified locale.
`static NumberFormat`	`getInstance()` Returns a general-purpose number format for the current default locale.
`static NumberFormat`	`getInstance(Locale inLocale)` Returns a general-purpose number format for the specified locale.
`static NumberFormat`	`getIntegerInstance()` Returns an integer number format for the current default locale.
`static NumberFormat`	`getIntegerInstance(Locale inLocale)` Returns an integer number format for the specified locale.
`int`	`getMaximumFractionDigits()` Returns the maximum number of digits allowed in the fraction portion of a number.
`int`	`getMaximumIntegerDigits()` Returns the maximum number of digits allowed in the integer portion of a number.
`int`	`getMinimumFractionDigits()` Returns the minimum number of digits allowed in the fraction portion of a number.
`int`	`getMinimumIntegerDigits()` Returns the minimum number of digits allowed in the integer portion of a number.
`static NumberFormat`	`getNumberInstance()` Returns a general-purpose number format for the current default locale.
`static NumberFormat`	`getNumberInstance(Locale inLocale)` Returns a general-purpose number format for the specified locale.
`static NumberFormat`	`getPercentInstance()` Returns a percentage format for the current default locale.
`static NumberFormat`	`getPercentInstance(Locale inLocale)` Returns a percentage format for the specified locale.
`RoundingMode`	`getRoundingMode()` Gets the `RoundingMode` used in this NumberFormat.
`int`	`hashCode()` Overrides hashCode
`boolean`	`isGroupingUsed()` Returns true if grouping is used in this format.
`boolean`	`isParseIntegerOnly()` Returns true if this format will parse numbers as integers only.
`Number`	`parse(String source)` Parses text from the beginning of the given string to produce a number.
`abstract Number`	`parse(String source, ParsePosition parsePosition)` Returns a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double.
`Object`	`parseObject(String source, ParsePosition pos)` Parses text from a string to produce a `Number`.
`void`	`setCurrency(Currency currency)` Sets the currency used by this number format when formatting currency values.
`void`	`setGroupingUsed(boolean newValue)` Set whether or not grouping will be used in this format.
`void`	`setMaximumFractionDigits(int newValue)` Sets the maximum number of digits allowed in the fraction portion of a number.
`void`	`setMaximumIntegerDigits(int newValue)` Sets the maximum number of digits allowed in the integer portion of a number.
`void`	`setMinimumFractionDigits(int newValue)` Sets the minimum number of digits allowed in the fraction portion of a number.
`void`	`setMinimumIntegerDigits(int newValue)` Sets the minimum number of digits allowed in the integer portion of a number.
`void`	`setParseIntegerOnly(boolean value)` Sets whether or not numbers should be parsed as integers only.
`void`	`setRoundingMode(RoundingMode roundingMode)` Sets the `RoundingMode` used in this NumberFormat.

Methods inherited from class java.text.Format
format, formatToCharacterIterator, parseObject

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

- Field Detail
  - INTEGER_FIELD
```
public static final 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.
    
    See Also:
    FieldPosition, Constant Field Values
  - FRACTION_FIELD
```
public static final 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.
    
    See Also:
    FieldPosition, Constant Field Values
- Constructor Detail
  - NumberFormat
```
protected NumberFormat()
```
    Sole constructor. (For invocation by subclass constructors, typically implicit.)
- Method Detail
  - format
```
public 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 extracts the number's value using Number.longValue() for all integral type values that can be converted to long without loss of information, including BigInteger values with a bit length of less than 64, and Number.doubleValue() for all other types. It then calls format(long,java.lang.StringBuffer,java.text.FieldPosition) or format(double,java.lang.StringBuffer,java.text.FieldPosition). This may result in loss of magnitude information and precision for BigInteger and BigDecimal values.
    
    Specified by:
    
    format in class Format
    
    Parameters:
    number - the number to format
    toAppendTo - the StringBuffer to which the formatted text is to be appended
    pos - On input: an alignment field, if desired. On output: the offsets of the alignment field.
    
    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:
    FieldPosition
  - parseObject
```
public final Object parseObject(String source,
                 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.
    See the parse(String, ParsePosition) method for more information on number parsing.
    
    Specified by:
    
    parseObject in class Format
    
    Parameters:
    source - A String, part of which should be parsed.
    pos - A ParsePosition object with index and error index information as described above.
    
    Returns:
    A Number parsed from the string. In case of error, returns null.
    
    Throws:
    
    NullPointerException - if pos is null.
  - format
```
public final String format(double number)
```
    Specialization of format.
    
    Throws:
    
    ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
    See Also:
    Format.format(java.lang.Object)
  - format
```
public final String format(long number)
```
    Specialization of format.
    
    Throws:
    
    ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
    See Also:
    Format.format(java.lang.Object)
  - format
```
public abstract StringBuffer format(double number,
                  StringBuffer toAppendTo,
                  FieldPosition pos)
```
    Specialization of format.
    
    Throws:
    
    ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
    See Also:
    Format.format(java.lang.Object)
  - format
```
public abstract StringBuffer format(long number,
                  StringBuffer toAppendTo,
                  FieldPosition pos)
```
    Specialization of format.
    
    Throws:
    
    ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
    See Also:
    Format.format(java.lang.Object)
  - parse
```
public abstract Number parse(String source,
           ParsePosition parsePosition)
```
    Returns a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double. If IntegerOnly is set, will stop at a decimal point (or equivalent; e.g., for rational numbers "1 2/3", will stop after the 1). Does not throw an exception; if no object can be parsed, index is unchanged!
    
    See Also:
    isParseIntegerOnly(), Format.parseObject(java.lang.String, java.text.ParsePosition)
  - parse
```
public Number parse(String source)
             throws ParseException
```
    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(String, ParsePosition) method for more information on number parsing.
    
    Parameters:
    source - A String whose beginning should be parsed.
    
    Returns:
    A Number parsed from the string.
    
    Throws:
    
    ParseException - if the beginning of the specified string cannot be parsed.
  - isParseIntegerOnly
```
public boolean isParseIntegerOnly()
```
    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 dependant and determined by sub-classes of NumberFormat.
  - setParseIntegerOnly
```
public void setParseIntegerOnly(boolean value)
```
    Sets whether or not numbers should be parsed as integers only.
    
    See Also:
    isParseIntegerOnly()
  - getInstance
```
public static final NumberFormat getInstance()
```
    Returns a general-purpose number format for the current default locale. This is the same as calling getNumberInstance().
  - getInstance
```
public static NumberFormat getInstance(Locale inLocale)
```
    Returns a general-purpose number format for the specified locale. This is the same as calling getNumberInstance(inLocale).
  - getNumberInstance
```
public static final NumberFormat getNumberInstance()
```
    Returns a general-purpose number format for the current default locale.
  - getNumberInstance
```
public static NumberFormat getNumberInstance(Locale inLocale)
```
    Returns a general-purpose number format for the specified locale.
  - getIntegerInstance
```
public static final NumberFormat getIntegerInstance()
```
    Returns an integer number format for the current default 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).
    
    Returns:
    a number format for integer values
    Since:
    
    1.4
    
    See Also:
    getRoundingMode()
  - getIntegerInstance
```
public static NumberFormat getIntegerInstance(Locale inLocale)
```
    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).
    
    Returns:
    a number format for integer values
    Since:
    
    1.4
    
    See Also:
    getRoundingMode()
  - getCurrencyInstance
```
public static final NumberFormat getCurrencyInstance()
```
    Returns a currency format for the current default locale.
  - getCurrencyInstance
```
public static NumberFormat getCurrencyInstance(Locale inLocale)
```
    Returns a currency format for the specified locale.
  - getPercentInstance
```
public static final NumberFormat getPercentInstance()
```
    Returns a percentage format for the current default locale.
  - getPercentInstance
```
public static NumberFormat getPercentInstance(Locale inLocale)
```
    Returns a percentage format for the specified locale.
  - getAvailableLocales
```
public static Locale[] getAvailableLocales()
```
    Returns an array of all locales for which the get*Instance methods of this class can return localized instances. The returned array represents the union of locales supported by the Java runtime and by installed NumberFormatProvider implementations. It must contain at least a Locale instance equal to Locale.US.
    
    Returns:
    An array of locales for which localized NumberFormat instances are available.
  - hashCode
```
public int hashCode()
```
    Overrides hashCode
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    a hash code value for this object.
    See Also:
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - equals
```
public boolean equals(Object obj)
```
    Overrides equals
    
    Overrides:
    
    equals in class Object
    
    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:
    Object.hashCode(), HashMap
  - clone
```
public Object clone()
```
    Overrides Cloneable
    
    Overrides:
    
    clone in class Format
    
    Returns:
    a clone of this instance.
    See Also:
    Cloneable
  - isGroupingUsed
```
public boolean isGroupingUsed()
```
    Returns true if grouping is used in this format. For example, in the English locale, with grouping on, the number 1234567 might be formatted as "1,234,567". The grouping separator as well as the size of each group is locale dependant and is determined by sub-classes of NumberFormat.
    
    See Also:
    setGroupingUsed(boolean)
  - setGroupingUsed
```
public void setGroupingUsed(boolean newValue)
```
    Set whether or not grouping will be used in this format.
    
    See Also:
    isGroupingUsed()
  - getMaximumIntegerDigits
```
public int getMaximumIntegerDigits()
```
    Returns the maximum number of digits allowed in the integer portion of a number.
    
    See Also:
    setMaximumIntegerDigits(int)
  - setMaximumIntegerDigits
```
public void setMaximumIntegerDigits(int newValue)
```
    Sets the maximum number of digits allowed in the integer portion of a number. maximumIntegerDigits must be >= minimumIntegerDigits. If the new value for maximumIntegerDigits is less than the current value of minimumIntegerDigits, then minimumIntegerDigits will also be set to the new value.
    
    Parameters:
    newValue - the maximum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
    See Also:
    getMaximumIntegerDigits()
  - getMinimumIntegerDigits
```
public int getMinimumIntegerDigits()
```
    Returns the minimum number of digits allowed in the integer portion of a number.
    
    See Also:
    setMinimumIntegerDigits(int)
  - setMinimumIntegerDigits
```
public void setMinimumIntegerDigits(int newValue)
```
    Sets the minimum number of digits allowed in the integer portion of a number. minimumIntegerDigits must be <= maximumIntegerDigits. If the new value for minimumIntegerDigits exceeds the current value of maximumIntegerDigits, then maximumIntegerDigits will also be set to the new value
    
    Parameters:
    newValue - the minimum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
    See Also:
    getMinimumIntegerDigits()
  - getMaximumFractionDigits
```
public int getMaximumFractionDigits()
```
    Returns the maximum number of digits allowed in the fraction portion of a number.
    
    See Also:
    setMaximumFractionDigits(int)
  - setMaximumFractionDigits
```
public void setMaximumFractionDigits(int newValue)
```
    Sets the maximum number of digits allowed in the fraction portion of a number. maximumFractionDigits must be >= minimumFractionDigits. If the new value for maximumFractionDigits is less than the current value of minimumFractionDigits, then minimumFractionDigits will also be set to the new value.
    
    Parameters:
    newValue - the maximum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
    See Also:
    getMaximumFractionDigits()
  - getMinimumFractionDigits
```
public int getMinimumFractionDigits()
```
    Returns the minimum number of digits allowed in the fraction portion of a number.
    
    See Also:
    setMinimumFractionDigits(int)
  - setMinimumFractionDigits
```
public void setMinimumFractionDigits(int newValue)
```
    Sets the minimum number of digits allowed in the fraction portion of a number. minimumFractionDigits must be <= maximumFractionDigits. If the new value for minimumFractionDigits exceeds the current value of maximumFractionDigits, then maximumIntegerDigits will also be set to the new value
    
    Parameters:
    newValue - the minimum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
    See Also:
    getMinimumFractionDigits()
  - getCurrency
```
public Currency getCurrency()
```
    Gets the currency used by this number format when formatting currency values. The initial value is derived in a locale dependent way. The returned value may be null if no valid currency could be determined and no currency has been set using setCurrency.
    The default implementation throws UnsupportedOperationException.
    
    Returns:
    the currency used by this number format, or null
    
    Throws:
    
    UnsupportedOperationException - if the number format class doesn't implement currency formatting
    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 default implementation throws UnsupportedOperationException.
    
    Parameters:
    currency - the new currency to be used by this number format
    
    Throws:
    
    UnsupportedOperationException - if the number format class doesn't implement currency formatting
    
    NullPointerException - if currency is null
    Since:
    
    1.4
  - getRoundingMode
```
public RoundingMode getRoundingMode()
```
    Gets the RoundingMode used in this NumberFormat. The default implementation of this method in NumberFormat always throws UnsupportedOperationException. Subclasses which handle different rounding modes should override this method.
    
    Returns:
    The RoundingMode used for this NumberFormat.
    
    Throws:
    
    UnsupportedOperationException - The default implementation always throws this exception
    Since:
    
    1.6
    
    See Also:
    setRoundingMode(RoundingMode)
  - setRoundingMode
```
public void setRoundingMode(RoundingMode roundingMode)
```
    Sets the RoundingMode used in this NumberFormat. The default implementation of this method in NumberFormat always throws UnsupportedOperationException. Subclasses which handle different rounding modes should override this method.
    
    Parameters:
    roundingMode - The RoundingMode to be used
    
    Throws:
    
    UnsupportedOperationException - The default implementation always throws this exception
    
    NullPointerException - if roundingMode is null
    Since:
    
    1.6
    
    See Also:
    getRoundingMode()

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2020, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class NumberFormat

Synchronization

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.text.Format

Methods inherited from class java.lang.Object

Field Detail

INTEGER_FIELD

FRACTION_FIELD

Constructor Detail

NumberFormat

Method Detail

format

parseObject

format

format

format

format

parse

parse

isParseIntegerOnly

setParseIntegerOnly

getInstance

getInstance

getNumberInstance

getNumberInstance

getIntegerInstance

getIntegerInstance

getCurrencyInstance

getCurrencyInstance

getPercentInstance

getPercentInstance

getAvailableLocales

hashCode

equals

clone

isGroupingUsed

setGroupingUsed

getMaximumIntegerDigits

setMaximumIntegerDigits

getMinimumIntegerDigits

setMinimumIntegerDigits

getMaximumFractionDigits

setMaximumFractionDigits

getMinimumFractionDigits

setMinimumFractionDigits

getCurrency

setCurrency

getRoundingMode

setRoundingMode