File	Doc	Category	Size	Date	Package
NumberFormat.java	API Doc	Java SE 5 API	40536	Fri Aug 26 14:57:20 BST 2005	java.text

NumberFormat

• java.lang.Object
  • java.text.Format

Fields Summary
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.
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.
private static final Hashtable	cachedLocaleData Cache to hold the NumberPatterns of a Locale.
private static final int	NUMBERSTYLE
private static final int	CURRENCYSTYLE
private static final int	PERCENTSTYLE
private static final int	SCIENTIFICSTYLE
private static final int	INTEGERSTYLE
private boolean	groupingUsed True if the the grouping (i.e. thousands) separator is used when formatting and parsing numbers.
private byte	maxIntegerDigits The maximum number of digits allowed in the integer portion of a number. maxIntegerDigits must be greater than or equal to minIntegerDigits. Note: This field exists only for serialization compatibility with JDK 1.1. In Java platform 2 v1.2 and higher, the new int field maximumIntegerDigits is used instead. When writing to a stream, maxIntegerDigits is set to maximumIntegerDigits or Byte.MAX_VALUE, whichever is smaller. When reading from a stream, this field is used only if serialVersionOnStream is less than 1.
private byte	minIntegerDigits The minimum number of digits allowed in the integer portion of a number. minimumIntegerDigits must be less than or equal to maximumIntegerDigits. Note: This field exists only for serialization compatibility with JDK 1.1. In Java platform 2 v1.2 and higher, the new int field minimumIntegerDigits is used instead. When writing to a stream, minIntegerDigits is set to minimumIntegerDigits or Byte.MAX_VALUE, whichever is smaller. When reading from a stream, this field is used only if serialVersionOnStream is less than 1.
private byte	maxFractionDigits The maximum number of digits allowed in the fractional portion of a number. maximumFractionDigits must be greater than or equal to minimumFractionDigits. Note: This field exists only for serialization compatibility with JDK 1.1. In Java platform 2 v1.2 and higher, the new int field maximumFractionDigits is used instead. When writing to a stream, maxFractionDigits is set to maximumFractionDigits or Byte.MAX_VALUE, whichever is smaller. When reading from a stream, this field is used only if serialVersionOnStream is less than 1.
private byte	minFractionDigits The minimum number of digits allowed in the fractional portion of a number. minimumFractionDigits must be less than or equal to maximumFractionDigits. Note: This field exists only for serialization compatibility with JDK 1.1. In Java platform 2 v1.2 and higher, the new int field minimumFractionDigits is used instead. When writing to a stream, minFractionDigits is set to minimumFractionDigits or Byte.MAX_VALUE, whichever is smaller. When reading from a stream, this field is used only if serialVersionOnStream is less than 1.
private boolean	parseIntegerOnly True if this format will parse numbers as integers only.
private int	maximumIntegerDigits The maximum number of digits allowed in the integer portion of a number. maximumIntegerDigits must be greater than or equal to minimumIntegerDigits.
private int	minimumIntegerDigits The minimum number of digits allowed in the integer portion of a number. minimumIntegerDigits must be less than or equal to maximumIntegerDigits.
private int	maximumFractionDigits The maximum number of digits allowed in the fractional portion of a number. maximumFractionDigits must be greater than or equal to minimumFractionDigits.
private int	minimumFractionDigits The minimum number of digits allowed in the fractional portion of a number. minimumFractionDigits must be less than or equal to maximumFractionDigits.
static final int	currentSerialVersion
private int	serialVersionOnStream Describes the version of NumberFormat present on the stream. Possible values are: 0 (or uninitialized): the JDK 1.1 version of the stream format. In this version, the int fields such as maximumIntegerDigits were not present, and the byte fields such as maxIntegerDigits are used instead. 1: the 1.2 version of the stream format. The values of the byte fields such as maxIntegerDigits are ignored, and the int fields such as maximumIntegerDigits are used instead. When streaming out a NumberFormat, the most recent format (corresponding to the highest allowable serialVersionOnStream) is always written.
static final long	serialVersionUID

Constructors Summary

Methods Summary
public java.lang.Object	clone() Overrides Cloneable NumberFormat other = (NumberFormat) super.clone(); return other;
public boolean	equals(java.lang.Object obj) Overrides equals if (obj == null) { return false; } if (this == obj) { return true; } if (getClass() != obj.getClass()) { return false; } NumberFormat other = (NumberFormat) obj; return (maximumIntegerDigits == other.maximumIntegerDigits && minimumIntegerDigits == other.minimumIntegerDigits && maximumFractionDigits == other.maximumFractionDigits && minimumFractionDigits == other.minimumFractionDigits && groupingUsed == other.groupingUsed && parseIntegerOnly == other.parseIntegerOnly);
public java.lang.StringBuffer	format(java.lang.Object number, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos) Formats a number and appends the resulting text to the given string buffer. The number can be of any subclass of {@link java.lang.Number}. This implementation extracts the number's value using {@link java.lang.Number#longValue()} for all integral type values that can be converted to long without loss of information, including BigInteger values with a {@link java.math.BigInteger#bitLength() bit length} of less than 64, and {@link java.lang.Number#doubleValue()} for all other types. It then calls {@link #format(long,java.lang.StringBuffer,java.text.FieldPosition)} or {@link #format(double,java.lang.StringBuffer,java.text.FieldPosition)}. This may result in loss of magnitude information and precision for BigInteger and BigDecimal values. param number the number to format param toAppendTo the StringBuffer to which the formatted text is to be appended param pos On input: an alignment field, if desired. On output: the offsets of the alignment field. return the value passed in as toAppendTo exception IllegalArgumentException if number is null or not an instance of Number. exception NullPointerException if toAppendTo or pos is null see java.text.FieldPosition if (number instanceof Long || number instanceof Integer || number instanceof Short || number instanceof Byte || (number instanceof BigInteger && ((BigInteger)number).bitLength() < 64)) { return format(((Number)number).longValue(), toAppendTo, pos); } else if (number instanceof Number) { return format(((Number)number).doubleValue(), toAppendTo, pos); } else { throw new IllegalArgumentException("Cannot format given Object as a Number"); }
public final java.lang.String	format(double number) Specialization of format. see java.text.Format#format return format(number, new StringBuffer(), DontCareFieldPosition.INSTANCE).toString();
public final java.lang.String	format(long number) Specialization of format. see java.text.Format#format return format(number, new StringBuffer(), DontCareFieldPosition.INSTANCE).toString();
public abstract java.lang.StringBuffer	format(double number, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos) Specialization of format. see java.text.Format#format
public abstract java.lang.StringBuffer	format(long number, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos) Specialization of format. see java.text.Format#format
public static java.util.Locale[]	getAvailableLocales() Returns an array of all locales for which the get*Instance methods of this class can return localized instances. The array returned must contain at least a Locale instance equal to {@link java.util.Locale#US Locale.US}. return An array of locales for which localized NumberFormat instances are available. return LocaleData.getAvailableLocales("NumberPatterns");
public java.util.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 {@link #setCurrency(java.util.Currency) setCurrency}. The default implementation throws UnsupportedOperationException. return the currency used by this number format, or null exception UnsupportedOperationException if the number format class doesn't implement currency formatting since 1.4 throw new UnsupportedOperationException();
public static final java.text.NumberFormat	getCurrencyInstance() Returns a currency format for the current default locale. return getInstance(Locale.getDefault(), CURRENCYSTYLE);
public static java.text.NumberFormat	getCurrencyInstance(java.util.Locale inLocale) Returns a currency format for the specified locale. return getInstance(inLocale, CURRENCYSTYLE);
public static final java.text.NumberFormat	getInstance() Returns a general-purpose number format for the current default locale. This is the same as calling {@link #getNumberInstance() getNumberInstance()}. return getInstance(Locale.getDefault(), NUMBERSTYLE);
public static java.text.NumberFormat	getInstance(java.util.Locale inLocale) Returns a general-purpose number format for the specified locale. This is the same as calling {@link #getNumberInstance(java.util.Locale) getNumberInstance(inLocale)}. return getInstance(inLocale, NUMBERSTYLE);
private static java.text.NumberFormat	getInstance(java.util.Locale desiredLocale, int choice) /* try the cache first */ String[] numberPatterns = (String[])cachedLocaleData.get(desiredLocale); if (numberPatterns == null) { /* cache miss */ ResourceBundle resource = LocaleData.getLocaleElements(desiredLocale); numberPatterns = resource.getStringArray("NumberPatterns"); /* update cache */ cachedLocaleData.put(desiredLocale, numberPatterns); } DecimalFormatSymbols symbols = new DecimalFormatSymbols(desiredLocale); int entry = (choice == INTEGERSTYLE) ? NUMBERSTYLE : choice; DecimalFormat format = new DecimalFormat(numberPatterns[entry], symbols); if (choice == INTEGERSTYLE) { format.setMaximumFractionDigits(0); format.setDecimalSeparatorAlwaysShown(false); format.setParseIntegerOnly(true); } else if (choice == CURRENCYSTYLE) { format.adjustForCurrencyDefaultFractionDigits(); } return format;
public static final java.text.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 IEEE half-even rounding (see {@link java.math.BigDecimal#ROUND_HALF_EVEN ROUND_HALF_EVEN}) for formatting, and to parse only the integer part of an input string (see {@link #isParseIntegerOnly isParseIntegerOnly}). return a number format for integer values since 1.4 return getInstance(Locale.getDefault(), INTEGERSTYLE);
public static java.text.NumberFormat	getIntegerInstance(java.util.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 IEEE half-even rounding (see {@link java.math.BigDecimal#ROUND_HALF_EVEN ROUND_HALF_EVEN}) for formatting, and to parse only the integer part of an input string (see {@link #isParseIntegerOnly isParseIntegerOnly}). param inLocale the locale for which a number format is needed return a number format for integer values since 1.4 return getInstance(inLocale, INTEGERSTYLE);
public int	getMaximumFractionDigits() Returns the maximum number of digits allowed in the fraction portion of a number. see #setMaximumFractionDigits return maximumFractionDigits;
public int	getMaximumIntegerDigits() Returns the maximum number of digits allowed in the integer portion of a number. see #setMaximumIntegerDigits return maximumIntegerDigits;
public int	getMinimumFractionDigits() Returns the minimum number of digits allowed in the fraction portion of a number. see #setMinimumFractionDigits return minimumFractionDigits;
public int	getMinimumIntegerDigits() Returns the minimum number of digits allowed in the integer portion of a number. see #setMinimumIntegerDigits return minimumIntegerDigits;
public static final java.text.NumberFormat	getNumberInstance() Returns a general-purpose number format for the current default locale. return getInstance(Locale.getDefault(), NUMBERSTYLE);
public static java.text.NumberFormat	getNumberInstance(java.util.Locale inLocale) Returns a general-purpose number format for the specified locale. return getInstance(inLocale, NUMBERSTYLE);
public static final java.text.NumberFormat	getPercentInstance() Returns a percentage format for the current default locale. return getInstance(Locale.getDefault(), PERCENTSTYLE);
public static java.text.NumberFormat	getPercentInstance(java.util.Locale inLocale) Returns a percentage format for the specified locale. return getInstance(inLocale, PERCENTSTYLE);
static final java.text.NumberFormat	getScientificInstance() Returns a scientific format for the current default locale. return getInstance(Locale.getDefault(), SCIENTIFICSTYLE);
static java.text.NumberFormat	getScientificInstance(java.util.Locale inLocale) Returns a scientific format for the specified locale. return getInstance(inLocale, SCIENTIFICSTYLE);
public int	hashCode() Overrides hashCode return maximumIntegerDigits * 37 + maxFractionDigits; // just enough fields for a reasonable distribution
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 #setGroupingUsed return groupingUsed;
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. return parseIntegerOnly;
public abstract java.lang.Number	parse(java.lang.String source, java.text.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 java.text.NumberFormat#isParseIntegerOnly see java.text.Format#parseObject
public java.lang.Number	parse(java.lang.String source) 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 {@link #parse(String, ParsePosition)} method for more information on number parsing. param source A String whose beginning should be parsed. return A Number parsed from the string. exception ParseException if the beginning of the specified string cannot be parsed. ParsePosition parsePosition = new ParsePosition(0); Number result = parse(source, parsePosition); if (parsePosition.index == 0) { throw new ParseException("Unparseable number: \"" + source + "\"", parsePosition.errorIndex); } return result;
public final java.lang.Object	parseObject(java.lang.String source, java.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. See the {@link #parse(String, ParsePosition)} method for more information on number parsing. param source A String, part of which should be parsed. param pos A ParsePosition object with index and error index information as described above. return A Number parsed from the string. In case of error, returns null. exception NullPointerException if pos is null. return parse(source, pos);
private void	readObject(java.io.ObjectInputStream stream) First, read in the default serializable data. Then, if serialVersionOnStream is less than 1, indicating that the stream was written by JDK 1.1, set the int fields such as maximumIntegerDigits to be equal to the byte fields such as maxIntegerDigits, since the int fields were not present in JDK 1.1. Finally, set serialVersionOnStream back to the maximum allowed value so that default serialization will work properly if this object is streamed out again. If minimumIntegerDigits is greater than maximumIntegerDigits or minimumFractionDigits is greater than maximumFractionDigits, then the stream data is invalid and this method throws an InvalidObjectException. In addition, if any of these values is negative, then this method throws an InvalidObjectException. since 1.2 stream.defaultReadObject(); if (serialVersionOnStream < 1) { // Didn't have additional int fields, reassign to use them. maximumIntegerDigits = maxIntegerDigits; minimumIntegerDigits = minIntegerDigits; maximumFractionDigits = maxFractionDigits; minimumFractionDigits = minFractionDigits; } if (minimumIntegerDigits > maximumIntegerDigits || minimumFractionDigits > maximumFractionDigits || minimumIntegerDigits < 0 || minimumFractionDigits < 0) { throw new InvalidObjectException("Digit count range invalid"); } serialVersionOnStream = currentSerialVersion;
public void	setCurrency(java.util.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. param currency the new currency to be used by this number format exception UnsupportedOperationException if the number format class doesn't implement currency formatting exception NullPointerException if currency is null since 1.4 throw new UnsupportedOperationException();
public void	setGroupingUsed(boolean newValue) Set whether or not grouping will be used in this format. see #isGroupingUsed groupingUsed = newValue;
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. param 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 #getMaximumFractionDigits maximumFractionDigits = Math.max(0,newValue); if (maximumFractionDigits < minimumFractionDigits) { minimumFractionDigits = maximumFractionDigits; }
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. param 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 #getMaximumIntegerDigits maximumIntegerDigits = Math.max(0,newValue); if (minimumIntegerDigits > maximumIntegerDigits) { minimumIntegerDigits = maximumIntegerDigits; }
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 param 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 #getMinimumFractionDigits minimumFractionDigits = Math.max(0,newValue); if (maximumFractionDigits < minimumFractionDigits) { maximumFractionDigits = minimumFractionDigits; }
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 param 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 #getMinimumIntegerDigits minimumIntegerDigits = Math.max(0,newValue); if (minimumIntegerDigits > maximumIntegerDigits) { maximumIntegerDigits = minimumIntegerDigits; }
public void	setParseIntegerOnly(boolean value) Sets whether or not numbers should be parsed as integers only. see #isParseIntegerOnly parseIntegerOnly = value;
private void	writeObject(java.io.ObjectOutputStream stream) Write out the default serializable data, after first setting the byte fields such as maxIntegerDigits to be equal to the int fields such as maximumIntegerDigits (or to Byte.MAX_VALUE, whichever is smaller), for compatibility with the JDK 1.1 version of the stream format. since 1.2 maxIntegerDigits = (maximumIntegerDigits > Byte.MAX_VALUE) ? Byte.MAX_VALUE : (byte)maximumIntegerDigits; minIntegerDigits = (minimumIntegerDigits > Byte.MAX_VALUE) ? Byte.MAX_VALUE : (byte)minimumIntegerDigits; maxFractionDigits = (maximumFractionDigits > Byte.MAX_VALUE) ? Byte.MAX_VALUE : (byte)maximumFractionDigits; minFractionDigits = (minimumFractionDigits > Byte.MAX_VALUE) ? Byte.MAX_VALUE : (byte)minimumFractionDigits; stream.defaultWriteObject();