Serial Number Format Factory 2
Mina Delahoussaye
You can't in anyway instantiate an abstract class so that method can't return a plain NumberFormat but something that is at least a NumberFormat. In this case the method is used to obtain a default formatter for your locale that will probably be a DecimalFormat or some variations of it
To obtain a NumberFormat for a specific locale, including the default locale, call one of NumberFormat's factory methods, such as getInstance(). In general, do not call the DecimalFormat constructors directly, since the NumberFormat factory methods may return subclasses other than DecimalFormat.
I know you can pass a format to JFormattedTextField constructor, but how would you change the formatter at runtime? For example I have a field that is supposed to be formated to integer values, but when a value of a certain combo box is changed, now the field is supposed to take float values.
Note that the constructor of DefaultFormatterFactory can take several formatters; a default one, a display format when it doesn't have focus, an edit format when it has focus, and a null format for when the field has a null value.
Formatted text fields provide a way for developers to specify the valid set of characters that can be typed in a text field. Specifically, the JFormattedTextField class adds a formatter and an object value to the features inherited from the JTextField class. The formatter translates the field's value into the text it displays, and the text into the field's value.
Using the formatters that Swing provides, you can set up formatted text fields to type dates and numbers in localized formats. Another kind of formatter enables you to use a character mask to specify the set of characters that can be typed at each position in the field. For example, you can specify a mask for typing phone numbers in a particular format, such as (XX) X-XX-XX-XX-XX.
If the possible values of a formatted text field have an obvious order, use a spinner instead. A spinner uses a formatted text field by default, but adds two buttons that enable the user to choose a value in a sequence.
Another alternative or adjunct to using a formatted text field is installing an input verifier on the field. A component's input verifier is called when the component nearly loses the keyboard focus. The input verifier enables you to check whether the value of the component is valid and optionally change it or stop the focus from being transferred.
The constructor used to create the amountField object takes a java.text.Format argument. The Format object is used by the field's formatter to translate the field's value to text and the text to the field's value.
The remaining code sets up the amountField object. The setValue method sets the field's value property to a floating-point number represented as a Double object. The setColumns method, inherited from the JTextField class, hints about the preferred size of the field. The call to the addPropertyChangeListener method registers a listener for the value property of the field, so the program can update the Monthly Payment field whenever the user changes the loan amount.
The code for setting up the rateField object is almost identical to the code listed previously for other fields. The only difference is that the format is slightly different, thanks to the code percentFormat.setMinimumFractionDigits(2).
The code that creates the numPeriodsField object does not explicitly set a format or formatter. Instead, it sets the value to an Integer and enables the field to use the default formatter for Integer objects. The code did not do this in the previous two fields because the default formatter is not being used for Double objects. The result was not what was needed. How to specify formats and formatters is covered later in this section.
To be more precise, the value of a formatted text field can be set by using either the setValue method or the commitEdit method. The setValue method sets the value to the specified argument. The argument can technically be any Object, but the formatter needs to be able to convert it into a string. Otherwise, the text field does not display any substantive information.
The commitEdit method sets the value to whatever object the formatter determines is represented by the field's text. The commitEdit method is automatically called when either of the following happens:
Note that although the JFormattedTextField class inherits the setText method from the JTextField class, you do not usually call the setText method on a formatted text field. If you do, the field's display changes accordingly but the value is not updated (unless the field's formatter updates it constantly).
To obtain a formatted text field's current value, use the getValue method. If necessary, you can ensure that the value reflects the text by calling the commitEdit method before getValue. Because the getValue method returns an Object, you need to cast it to the type used for your field's value. For example:
To detect changes in a formatted text field's value, you can register a property change listener on the formatted text field to listen for changes to the "value" property. The property change listener is taken from the FormattedTextFieldDemo example:
The Format class provides a way to format locale-sensitive information such as dates and numbers. Formatters that descend from the InternationalFormatter class, such as the DateFormatter and NumberFormatter classes, use Format objects to translate between the field's text and value. You can obtain a Format object by calling one of the factory methods in the DateFormat or NumberFormat classes, or by using one of the SimpleDateFormat constructors.
You can customize certain format aspects when you create the Format object, and others through a format-specific API. For example, DecimalFormat objects, which inherit from NumberFormat and are often returned by its factory methods, can be customized by using the setMaximumFractionDigits and setNegativePrefix methods. For information about using Format objects, see the Formatting lesson of the Internationalization trail.
The easiest way to associate a customized format with a formatted text field is to create the field by using the JFormattedTextField constructor that takes a Format as an argument. You can see this association in the previous code examples that create amountField and rateField objects.
The MaskFormatter class implements a formatter that specifies exactly which characters are valid in each position of the field's text. For example, the following code creates a MaskFormatter that lets the user to type a five-digit zip code:
When specifying formatters, keep in mind that each formatter object can be used by at most one formatted text field at a time. Each field should have at least one formatter associated with it, of which exactly one is used at any time.
You can set a field's formatter factory either by creating the field using a constructor that takes a formatter factory argument, or by calling the setFormatterFactory method on the field. To create a formatter factory, you can often use an instance of DefaultFormatterFactory class. A DefaultFormatterFactory object enables you to specify the formatters returned when a value is being edited, is not being edited, or has a null value.
The following figures show an application based on the FormattedTextFieldDemo example that uses formatter factories to set multiple editors for the Loan Amount and APR fields. While the user is editing the Loan Amount, the $ character is not used so that the user is not forced to type it. Similarly, while the user is editing the APR field, the % character is not required.
The boldface code highlights the calls to DefaultFormatterFactory constructors. The first argument to the constructor specifies the default formatter to use for the formatted text field. The second argument specifies the display formatter, which is used when the field does not have the focus. The third argument specifies the edit formatter, which is used when the field has the focus. The code does not use a fourth argument, but if it did, the fourth argument would specify the null formatter, which is used when the field's value is null. Because no null formatter is specified, the default formatter is used when the value is null.
The code customizes the formatter that uses percentEditFormat by creating a subclass of the NumberFormatter class. This subclass overrides the valueToString and stringToValue methods of NumberFormatter so that they convert the displayed number to the value actually used in calculations, and convert the value to a number. Specifically, the displayed number is 100 times the actual value. The reason is that the percent format used by the display formatter automatically displays the text as 100 times the value, so the corresponding editor formatter must display the text at the same value. The FormattedTextFieldDemo example does not need to take care of this conversion because this demo uses only one format for both display and editing.
Format Factory is an easy-to-use application that allows you to convert the format of one group of files at a time.editing. For example, you can use Format Factory to record, combine, combine, and cut videos.It can also be used to combine and mix sound.
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