Examples of java.text.NumberFormat

java.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.
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 DecimalFormat @see ChoiceFormat @version 1.74, 11/17/05 @author Mark Davis @author Helena Shih

   *
   * @param f The format.
   */
  public void setFormatter(final Format f)
  {
    final NumberFormat fm = (NumberFormat) f;
    super.setFormatter(fm);
  }

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     * @param number the number to format
     * @return a currency formatted number string
     */
    public String currency(Number number) {
        if (number != null) {
            NumberFormat format = NumberFormat.getCurrencyInstance(getLocale());


            return format.format(number.doubleValue());


        } else {
            return getEmptyString();
        }
    }

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     * @param number the number value to format
     * @return a percentage formatted number string
     */
    public String percentage(Number number) {
        if (number != null) {
            NumberFormat format = NumberFormat.getPercentInstance(getLocale());


            return format.format(number.doubleValue());


        } else {
            return getEmptyString();
        }
    }

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                                              String semisphere) {
        double valueAbs = Math.abs(value);
        int degrees = (int) valueAbs;
        double minutes = (valueAbs - degrees) * 60.0;


        NumberFormat nf = NumberFormat.getInstance();
        nf.setGroupingUsed(false);
        nf.setMinimumIntegerDigits(integerDigits);
        nf.setMaximumIntegerDigits(integerDigits);
        String strDegrees = nf.format(degrees);
        nf.setMinimumIntegerDigits(2);
        nf.setMaximumIntegerDigits(2);
        nf.setMinimumFractionDigits(3);
        nf.setMaximumFractionDigits(3);
        String strMinutes = nf.format(minutes);
        return strDegrees + DEGREE_SIGN + strMinutes + "'" + semisphere;
    }

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                                                 final Object value, final boolean isSelected,
                                                 final boolean hasFocus, final int row, final int column)
  {


    setFont(null);
    final NumberFormat nf = NumberFormat.getNumberInstance();
    if (value != null)
    {
      setText(nf.format(value));
    }
    else
    {
      setText("");
    }

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    // Get it's eng format. Get it as string without trailing 0's
    final double outputValue = rounded / Math.pow(10, Math.floor(log10 / 3.0) * 3);
    final int outputValueDecimalPlaces = Math.max (1, computeLog10(outputValue));
    
    final Locale locale = context.getLocalizationContext().getLocale();
    final NumberFormat decimalFormat = createDecimalFormat(fixedSize, outputValueDecimalPlaces, precision, locale);
    final String result = decimalFormat.format(outputValue) + SUFFIXES[index];
    return new TypeValuePair(TextType.TYPE, result);
  }

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  private NumberFormat createDecimalFormat(final boolean fixedSize,
                                           final int decimalPlaces,
                                           final int precision,
                                           final Locale locale)
  {
    final NumberFormat format = NumberFormat.getNumberInstance(locale);
    format.setGroupingUsed(false);
    if (fixedSize)
    {
      format.setMinimumFractionDigits(Math.max(0, precision - decimalPlaces - 1));
    }
    else
    {
      format.setMinimumFractionDigits(precision);
    }
    return format;
  }

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    public void setCurrency(Currency currency) {
        this.currency = currency;
    }


    @Override public String getCaption(Locale locale) {
        NumberFormat formatter = locale == null ? NumberFormat.getCurrencyInstance() : NumberFormat.getCurrencyInstance(locale);
        formatter.setCurrency(currency.getCurrency());
        return formatter.format(amount);
    }

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     */


    public String getCurveInformation(double xmin, double xmax){
        try{
            computeStatistics(xmin, xmax);
            NumberFormat nf = NumberFormat.getInstance();
            nf.setMaximumFractionDigits(STATISTIC_ACCURACY);    


            String curveStat ="";


            if (SHOW_X_MIN){
                curveStat += "X min = " + nf.format(localRangeMinPoint.x)  + "; ";
            }
            if (SHOW_X_MAX){
                curveStat += "X max = " + nf.format(localRangeMaxPoint.x)  + "; ";
            }
            if (SHOW_Y_MIN){
                curveStat += "Y min = " + nf.format(localRangeMinPoint.y)  + "; ";
            }
            if (SHOW_Y_MAX){
                curveStat += "Y max = " + nf.format(localRangeMaxPoint.y)  + "; ";
            }
            if (SHOW_POINT_NUMBER){
                curveStat += "Nb pts = " + getLocalNbPoints()  + "; ";
            }
            if (SHOW_MEAN){
                curveStat += "Mean = " + nf.format(getLocalRangeMean()) + "; ";
            }
            if (SHOW_DEVIATION){
                curveStat += "Deviation = " + nf.format(getLocalDeviationValue()) + "; ";
            }
            if (SHOW_INTEGRAL){
                curveStat += "Integral = " + nf.format(getLocalIntegralValue())  + "; ";
            }


            return curveStat;


        }catch (DataException e){

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   *
   * @param value Der Wert. (Zwischen 0 und 1)
   * @return Der Wert in Prozent.
   */
  public static String toPercentString(double value) {
    NumberFormat format = NumberFormat.getPercentInstance();
    format.setMinimumFractionDigits(2);
    format.setMaximumFractionDigits(2);
    return format.format(value);
  }

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