Examples of com.ibm.icu.text.NumberFormat

com.ibm.icu.text.NumberFormat
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.
This is an enhanced version of NumberFormat that is based on the standard version in the JDK. New or changed functionality is labeled NEW or CHANGED.
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 < a.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 is 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 '6') if false, "3456.78" -> 3456.78 (and leaves the parse position just after '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 on DecimalFormat.
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.

DecimalFormat

DecimalFormat is the concrete implementation of NumberFormat, and the NumberFormat API is essentially an abstraction from DecimalFormat's API. Refer to DecimalFormat for more information about this API.
see DecimalFormat see java.text.ChoiceFormat @author Mark Davis @author Helena Shih @author Alan Liu @stable ICU 2.0


    /*
     * Test method for 'com.ibm.icu.x.text.NumberFormat.setMinimumFractionDigits(int)'
     */
    public void testSetMinimumFractionDigits() {
        NumberFormat nf = NumberFormat.getInstance();
        nf.setMinimumFractionDigits(4);
        assertEquals("1.2000", nf.format(1.2));
    }

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    /*
     * Test method for 'com.ibm.icu.x.text.NumberFormat.hashCode()'
     */
    public void testHashCode() {
        NumberFormat nf = NumberFormat.getInstance();
        NumberFormat eq = NumberFormat.getInstance(Locale.US);
        NumberFormat neq = NumberFormat.getInstance(Locale.GERMANY);
                
        ICUTestCase.testEHCS(nf, eq, neq);
    }

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     * Test method for 'com.ibm.icu.text.MessageFormat.getFormats()'
     */
    public void testGetFormats() {
        MessageFormat mf = new MessageFormat(pattern, Locale.US);
        Format[] formats = mf.getFormats();
        NumberFormat nf = NumberFormat.getNumberInstance(Locale.US);
        assertEquals(formats[0], nf);
        DateFormat tf = DateFormat.getTimeInstance(DateFormat.SHORT, Locale.US);
        assertEquals(formats[1], tf);
        DateFormat df = DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.US);
        assertEquals(formats[2], df);

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   * hour is set to fields[1], minute is set to fields[2] and second is
   * set to fields[3].
   * @return Returns true when the given custom id is valid.
   */
  static boolean parseCustomID(String id, int[] fields) {
    NumberFormat numberFormat = null;


    if (id != null && id.length() > kGMT_ID.length() && id.toUpperCase(Locale.ENGLISH).startsWith(kGMT_ID)) {
      ParsePosition pos = new ParsePosition(kGMT_ID.length());
      int sign = 1;
      int hour = 0;
      int min = 0;
      int sec = 0;


      if (id.charAt(pos.getIndex()) == 0x002D /*'-'*/) {
        sign = -1;
      } else if (id.charAt(pos.getIndex()) != 0x002B /*'+'*/) {
        return false;
      }
      pos.setIndex(pos.getIndex() + 1);


      numberFormat = NumberFormat.getInstance();
      numberFormat.setParseIntegerOnly(true);


      // Look for either hh:mm, hhmm, or hh
      int start = pos.getIndex();


      Number n = numberFormat.parse(id, pos);
      if (pos.getIndex() == start) {
        return false;
      }
      hour = n.intValue();


      if (pos.getIndex() < id.length()) {
        if (pos.getIndex() - start > 2 || id.charAt(pos.getIndex()) != 0x003A /*':'*/) {
          return false;
        }
        // hh:mm
        pos.setIndex(pos.getIndex() + 1);
        int oldPos = pos.getIndex();
        n = numberFormat.parse(id, pos);
        if ((pos.getIndex() - oldPos) != 2) {
          // must be 2 digits
          return false;
        }
        min = n.intValue();
        if (pos.getIndex() < id.length()) {
          if (id.charAt(pos.getIndex()) != 0x003A /*':'*/) {
            return false;
          }
          // [:ss]
          pos.setIndex(pos.getIndex() + 1);
          oldPos = pos.getIndex();
          n = numberFormat.parse(id, pos);
          if (pos.getIndex() != id.length() || (pos.getIndex() - oldPos) != 2) {
            return false;
          }
          sec = n.intValue();
        }

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     */
    public NumberFormat getNumberFormat(int style) {
        if (style < 0 || style >= NF_LIMIT) {
            throw new IllegalArgumentException("Illegal number format type");
        }
        NumberFormat result = null;
        if (numberFormats != null) {
            result = numberFormats[style];
        }
        if (result != null) {
            result = (NumberFormat) result.clone(); // clone for safety (later optimize)
        } else {
            result = guessNumberFormat(style);
        }
        return result;
    }

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     * @param style
     * @draft ICU 3.6
     * @provisional This API might change or be removed in a future release.
     */
    protected NumberFormat guessNumberFormat(int style) {
        NumberFormat result;
        ULocale nfLocale = getAvailableLocale(TYPE_NUMBERFORMAT);
        if (nfLocale == null) {
            nfLocale = ULocale.ROOT;
        }
        switch (style) {
        case NF_NUMBER:
            result = NumberFormat.getInstance(nfLocale);
            break;
        case NF_SCIENTIFIC:
            result = NumberFormat.getScientificInstance(nfLocale);
            break;
        case NF_INTEGER:
            result = NumberFormat.getIntegerInstance(nfLocale);
            break;
        case NF_PERCENT:
            result = NumberFormat.getPercentInstance(nfLocale);
            break;
        case NF_CURRENCY:
            result = NumberFormat.getCurrencyInstance(nfLocale);
            result.setCurrency(getCurrency());
            break;
        default:
            throw new IllegalArgumentException("Unknown number format style");
        }
        return result;

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     */
    public NumberFormat getNumberFormat(int style) {
        if (style < 0 || style >= NF_LIMIT) {
            throw new IllegalArgumentException("Illegal number format type");
        }
        NumberFormat result = null;
        if (numberFormats != null) {
            result = numberFormats[style];
        }
        if (result != null) {
            result = (NumberFormat) result.clone(); // clone for safety (later optimize)
        } else {
            result = guessNumberFormat(style);
        }
        return result;
    }

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     * @param style
     * @draft ICU 3.6
     * @provisional This API might change or be removed in a future release.
     */
    protected NumberFormat guessNumberFormat(int style) {
        NumberFormat result;
        ULocale nfLocale = getAvailableLocale(TYPE_NUMBERFORMAT);
        if (nfLocale == null) {
            nfLocale = ULocale.ROOT;
        }
        switch (style) {
        case NF_NUMBER:
            result = NumberFormat.getInstance(nfLocale);
            break;
        case NF_SCIENTIFIC:
            result = NumberFormat.getScientificInstance(nfLocale);
            break;
        case NF_INTEGER:
            result = NumberFormat.getIntegerInstance(nfLocale);
            break;
        case NF_PERCENT:
            result = NumberFormat.getPercentInstance(nfLocale);
            break;
        case NF_CURRENCY:
            result = NumberFormat.getCurrencyInstance(nfLocale);
            result.setCurrency(getCurrency());
            break;
        default:
            throw new IllegalArgumentException("Unknown number format style");
        }
        return result;

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  private synchronized static Map getConverterMap() {
    // using string-based lookup avoids loading of too many classes
    if (converterMap == null) {
      // NumberFormat to be shared across converters for the formatting of
      // integer values
      NumberFormat integerFormat = NumberFormat.getIntegerInstance();
      // NumberFormat to be shared across converters for formatting non
      // integer values
      NumberFormat numberFormat = NumberFormat.getNumberInstance();


      converterMap = new HashMap();
      // Standard and Boxed Types
      converterMap
          .put(

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     */
    public NumberFormat getNumberFormat(int style) {
        if (style < 0 || style >= NF_LIMIT) {
            throw new IllegalArgumentException("Illegal number format type");
        }
        NumberFormat result = null;
        if (numberFormats != null) {
            result = numberFormats[style];
        }
        if (result != null) {
            result = (NumberFormat) result.clone(); // clone for safety (later optimize)
        } else {
            result = guessNumberFormat(style);
        }
        return result;
    }

View Full Code Here

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Examples of com.ibm.icu.text.NumberFormat

Synchronization

DecimalFormat

Related Classes of com.ibm.icu.text.NumberFormat