javax.swing
Class JFormattedTextField

java.lang.Object   
  java.awt.Component   
      java.awt.Container   
          javax.swing.JComponent   
              javax.swing.text.JTextComponent   
                  javax.swing.JTextField   
                      javax.swing.JFormattedTextField

All Implemented Interfaces:

ImageObserver , MenuContainer , Serializable , Accessible , Scrollable , SwingConstants

public class JFormattedTextField
extends JTextField   

JFormattedTextField extends JTextField adding support for formatting arbitrary values, as well as retrieving a particular object once the user has edited the text. The following illustrates configuring a JFormattedTextField to edit dates:

   JFormattedTextField ftf = new JFormattedTextField();
   ftf.setValue(new Date());
 

Once a JFormattedTextField has been created, you can listen for editing changes by way of adding a PropertyChangeListener and listening for PropertyChangeEvents with the property name value.

JFormattedTextField allows configuring what action should be taken when focus is lost. The possible configurations are:

Value	Description
JFormattedTextField.REVERT	Revert the display to match that of getValue, possibly losing the current edit.
JFormattedTextField.COMMIT	Commits the current value. If the value being edited isn't considered a legal value by the AbstractFormatter that is, a ParseException is thrown, then the value will not change, and then edited value will persist.
JFormattedTextField.COMMIT_OR_REVERT	Similar to COMMIT, but if the value isn't legal, behave like REVERT.
JFormattedTextField.PERSIST	Do nothing, don't obtain a new AbstractFormatter, and don't update the value.

The default is JFormattedTextField.COMMIT_OR_REVERT, refer to setFocusLostBehavior(int) for more information on this.

JFormattedTextField allows the focus to leave, even if the currently edited value is invalid. To lock the focus down while the JFormattedTextField is an invalid edit state you can attach an InputVerifier. The following code snippet shows a potential implementation of such an InputVerifier:

 public class FormattedTextFieldVerifier extends InputVerifier {
     public boolean verify(JComponent input) {
         if (input instanceof JFormattedTextField) {
             JFormattedTextField ftf = (JFormattedTextField)input;
             AbstractFormatter formatter = ftf.getFormatter();
             if (formatter != null) {
                 String text = ftf.getText();
                 try {
                      formatter.stringToValue(text);
                      return true;
                  } catch (ParseException pe) {
                      return false;
                  }
              }
          }
          return true;
      }
      public boolean shouldYieldFocus(JComponent input) {
          return verify(input);
      }
  }
 

Alternatively, you could invoke commitEdit, which would also commit the value.

JFormattedTextField does not do the formatting it self, rather formatting is done through an instance of JFormattedTextField.AbstractFormatter which is obtained from an instance of JFormattedTextField.AbstractFormatterFactory. Instances of JFormattedTextField.AbstractFormatter are notified when they become active by way of the install method, at which point the JFormattedTextField.AbstractFormatter can install whatever it needs to, typically a DocumentFilter. Similarly when JFormattedTextField no longer needs the AbstractFormatter, it will invoke uninstall.

JFormattedTextField typically queries the AbstractFormatterFactory for an AbstractFormat when it gains or loses focus. Although this can change based on the focus lost policy. If the focus lost policy is JFormattedTextField.PERSIST and the JFormattedTextField has been edited, the AbstractFormatterFactory will not be queried until the value has been commited. Similarly if the focus lost policy is JFormattedTextField.COMMIT and an exception is thrown from stringToValue, the AbstractFormatterFactory will not be querired when focus is lost or gained.

JFormattedTextField.AbstractFormatter is also responsible for determining when values are commited to the JFormattedTextField. Some JFormattedTextField.AbstractFormatters will make new values available on every edit, and others will never commit the value. You can force the current value to be obtained from the current JFormattedTextField.AbstractFormatter by way of invoking commitEdit. commitEdit will be invoked whenever return is pressed in the JFormattedTextField.

If an AbstractFormatterFactory has not been explicitly set, one will be set based on the Class of the value type after setValue has been invoked (assuming value is non-null). For example, in the following code an appropriate AbstractFormatterFactory and AbstractFormatter will be created to handle formatting of numbers:

   JFormattedTextField tf = new JFormattedTextField();
   tf.setValue(new Number(100));
 

Warning: As the AbstractFormatter will typically install a DocumentFilter on the Document, and a NavigationFilter on the JFormattedTextField you should not install your own. If you do, you are likely to see odd behavior in that the editing policy of the AbstractFormatter will not be enforced.

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^TM has been added to the java.beans package. Please see XMLEncoder .

Since:

1.4

See Also:

Serialized Form

Nested Class Summary

static class	JFormattedTextField.AbstractFormatter Instances of AbstractFormatter are used by JFormattedTextField to handle the conversion both from an Object to a String, and back from a String to an Object.
static class	JFormattedTextField.AbstractFormatterFactory Instances of AbstractFormatterFactory are used by JFormattedTextField to obtain instances of AbstractFormatter which in turn are used to format values.

Nested classes/interfaces inherited from class javax.swing.JTextField

JTextField.AccessibleJTextField

Nested classes/interfaces inherited from class javax.swing.text.JTextComponent

JTextComponent.AccessibleJTextComponent , JTextComponent.KeyBinding

Nested classes/interfaces inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent , Component.BltBufferStrategy , Component.FlipBufferStrategy

Field Summary

static int	COMMIT Constant identifying that when focus is lost, commitEdit should be invoked.
static int	COMMIT_OR_REVERT Constant identifying that when focus is lost, commitEdit should be invoked.
static int	PERSIST Constant identifying that when focus is lost, the edited value should be left.
static int	REVERT Constant identifying that when focus is lost, editing value should be reverted to current value set on the JFormattedTextField.

Fields inherited from class javax.swing.JTextField

notifyAction

Fields inherited from class javax.swing.text.JTextComponent

DEFAULT_KEYMAP , FOCUS_ACCELERATOR_KEY

Fields inherited from class javax.swing.JComponent

accessibleContext , listenerList , TOOL_TIP_TEXT_KEY , ui , UNDEFINED_CONDITION , WHEN_ANCESTOR_OF_FOCUSED_COMPONENT , WHEN_FOCUSED , WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT , CENTER_ALIGNMENT , LEFT_ALIGNMENT , RIGHT_ALIGNMENT , TOP_ALIGNMENT

Fields inherited from interface javax.swing.SwingConstants

BOTTOM , CENTER , EAST , HORIZONTAL , LEADING , LEFT , NEXT , NORTH , NORTH_EAST , NORTH_WEST , PREVIOUS , RIGHT , SOUTH , SOUTH_EAST , SOUTH_WEST , TOP , TRAILING , VERTICAL , WEST

Fields inherited from interface java.awt.image.ImageObserver

ABORT , ALLBITS , ERROR , FRAMEBITS , HEIGHT , PROPERTIES , SOMEBITS , WIDTH

Constructor Summary

JFormattedTextField ()
Creates a JFormattedTextField with no AbstractFormatterFactory.

JFormattedTextField (Format format)
Creates a JFormattedTextField.

JFormattedTextField (JFormattedTextField.AbstractFormatter formatter)
Creates a JFormattedTextField with the specified AbstractFormatter.

JFormattedTextField (JFormattedTextField.AbstractFormatterFactory factory)
Creates a JFormattedTextField with the specified AbstractFormatterFactory.

JFormattedTextField (JFormattedTextField.AbstractFormatterFactory factory, Object currentValue)
Creates a JFormattedTextField with the specified AbstractFormatterFactory and initial value.

JFormattedTextField (Object value)
Creates a JFormattedTextField with the specified value.

Method Summary

void	commitEdit () Forces the current value to be taken from the AbstractFormatter and set as the current value.
Action []	getActions () Fetches the command list for the editor.
int	getFocusLostBehavior () Returns the behavior when focus is lost.
JFormattedTextField.AbstractFormatter	getFormatter () Returns the AbstractFormatter that is used to format and parse the current value.
JFormattedTextField.AbstractFormatterFactory	getFormatterFactory () Returns the current AbstractFormatterFactory.
String	getUIClassID () Gets the class ID for a UI.
Object	getValue () Returns the last valid value.
protected void	invalidEdit () Invoked when the user inputs an invalid value.
boolean	isEditValid () Returns true if the current value being edited is valid.
protected void	processFocusEvent (FocusEvent e) Processes any focus events, such as FocusEvent.FOCUS_GAINED or FocusEvent.FOCUS_LOST.
protected void	processInputMethodEvent (InputMethodEvent e) Processes any input method events, such as InputMethodEvent.INPUT_METHOD_TEXT_CHANGED or InputMethodEvent.CARET_POSITION_CHANGED.
void	setDocument (Document doc) Associates the editor with a text document.
void	setFocusLostBehavior (int behavior) Sets the behavior when focus is lost.
protected void	setFormatter (JFormattedTextField.AbstractFormatter format) Sets the current AbstractFormatter.
void	setFormatterFactory (JFormattedTextField.AbstractFormatterFactory tf) Sets the AbstractFormatterFactory.
void	setValue (Object value) Sets the value that will be formatted by an AbstractFormatter obtained from the current AbstractFormatterFactory.

Methods inherited from class javax.swing.JTextField

addActionListener , configurePropertiesFromAction , createActionPropertyChangeListener , createDefaultModel , fireActionPerformed , getAccessibleContext , getAction , getActionListeners , getColumns , getColumnWidth , getHorizontalAlignment , getHorizontalVisibility , getPreferredSize , getScrollOffset , isValidateRoot , paramString , postActionEvent , removeActionListener , scrollRectToVisible , setAction , setActionCommand , setColumns , setFont , setHorizontalAlignment , setScrollOffset

Methods inherited from class javax.swing.text.JTextComponent

addCaretListener