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## javax.swing.text
Class NumberFormatter

    java.lang.Object
      javax.swing.JFormattedTextField.AbstractFormatter
          javax.swing.text.DefaultFormatter
              javax.swing.text.InternationalFormatter
                  javax.swing.text.NumberFormatter

All Implemented Interfaces:
  Serializable, Cloneable

    public class NumberFormatter

extends InternationalFormatter

`NumberFormatter` subclasses `InternationalFormatter` adding special behavior for numbers. Among the specializations are (these are only used if the `NumberFormatter` does not display invalid nubers, eg `setAllowsInvalid(false)`):

- Pressing +/- (- is determined from the `DecimalFormatSymbols` associated with the `DecimalFormat`) in any field but the exponent field will attempt to change the sign of the number to positive/negative.
- Pressing +/- (- is determined from the `DecimalFormatSymbols` associated with the `DecimalFormat`) in the exponent field will attemp to change the sign of the exponent to positive/negative.

If you are displaying scientific numbers, you may wish to turn on overwrite mode, `setOverwriteMode(true)`. For example:

     DecimalFormat decimalFormat = new DecimalFormat("0.000E0");
     NumberFormatter textFormatter = new NumberFormatter(decimalFormat);
     textFormatter.setOverwriteMode(true);
     textFormatter.setAllowsInvalid(false);

If you are going to allow the user to enter decimal values, you should either force the DecimalFormat to contain at least one decimal (`#.0###`), or allow the value to be invalid `setAllowsInvalid(true)`. Otherwise users may not be able to input decimal values.

`NumberFormatter` provides slightly different behavior to `stringToValue` than that of its superclass. If you have specified a Class for values, `DefaultFormatter.setValueClass(java.lang.Class)`, that is one of of `Integer`, `Long`, `Float`, `Double`, `Byte` or `Short` and the Format's `parseObject` returns an instance of `Number`, the corresponding instance of the value class will be created using the constructor appropriate for the primitive type the value class represents. For example: `setValueClass(Integer.class)` will cause the resulting value to be created via `new Integer(((Number)formatter.parseObject(string)).intValue())`. This is typically useful if you wish to set a min/max value as the various `Number` implementations are generally not comparable to each other. This is also useful if for some reason you need a specific `Number` implementation for your values.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

Since:
  1.4

Constructor Summary
`NumberFormatter()` Creates a `NumberFormatter` with the a default `NumberFormat` instance obtained from `NumberFormat.getNumberInstance()`.
`NumberFormatter(NumberFormat format)` Creates a NumberFormatter with the specified Format instance.

Method Summary
`void` | `setFormat(Format format)` Sets the format that dictates the legal values that can be edited and displayed.

Methods inherited from class javax.swing.text.InternationalFormatter
`clone, getActions, getFields, getFormat, getMaximum, getMinimum, install, setMaximum, setMinimum, stringToValue, valueToString`

Methods inherited from class javax.swing.text.DefaultFormatter
`getAllowsInvalid, getCommitsOnValidEdit, getDocumentFilter, getNavigationFilter, getOverwriteMode, getValueClass, setAllowsInvalid, setCommitsOnValidEdit, setOverwriteMode, setValueClass`

Methods inherited from class javax.swing.JFormattedTextField.AbstractFormatter
`getFormattedTextField, invalidEdit, setEditValid, uninstall`

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

Constructor Detail

### NumberFormatter

    public NumberFormatter()

  Creates a `NumberFormatter` with the a default `NumberFormat` instance obtained from `NumberFormat.getNumberInstance()`.

### NumberFormatter

    public NumberFormatter(NumberFormat format)

  Creates a NumberFormatter with the specified Format instance.

  Parameters:
    `format` - Format used to dictate legal values

Method Detail

### setFormat

    public void setFormat(Format format)

  Sets the format that dictates the legal values that can be edited and displayed.

  If you have used the nullary constructor the value of this property will be determined for the current locale by way of the `NumberFormat.getNumberInstance()` method.

  Overrides:
    `setFormat` in class `InternationalFormatter`
  Parameters:
    `format` - NumberFormat instance used to dictate legal values

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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