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 numbers, for example, setAllowsInvalid(false)):
DecimalFormatSymbols associated with the
DecimalFormat) in any field but the exponent
field will attempt to change the sign of the number to
positive/negative.
DecimalFormatSymbols associated with the
DecimalFormat) in the exponent field will
attempt 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 JavaBeans™
has been added to the java.beans package.
Please see XMLEncoder.
| Constructor and Description |
|---|
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.
|
| Modifier and Type | Method and Description |
|---|---|
void |
setFormat(Format format)
Sets the format that dictates the legal values that can be edited
and displayed.
|
clone, getActions, getFields, getFormat, getMaximum, getMinimum, install, setMaximum, setMinimum, stringToValue, valueToStringgetAllowsInvalid, getCommitsOnValidEdit, getDocumentFilter, getNavigationFilter, getOverwriteMode, getValueClass, setAllowsInvalid, setCommitsOnValidEdit, setOverwriteMode, setValueClassgetFormattedTextField, invalidEdit, setEditValid, uninstallpublic NumberFormatter()
NumberFormatter with the a default
NumberFormat instance obtained from
NumberFormat.getNumberInstance().public NumberFormatter(NumberFormat format)
format - Format used to dictate legal valuespublic void setFormat(Format format)
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.
setFormat in class InternationalFormatterformat - NumberFormat instance used to dictate legal values 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.
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