public class JTextField extends JTextComponent implements SwingConstants
JTextField is a lightweight component that allows the editing
of a single line of text.
For information on and examples of using text fields,
see
How to Use Text Fields
in The Java Tutorial.
JTextField is intended to be source-compatible
with java.awt.TextField where it is reasonable to do so. This
component has capabilities not found in the java.awt.TextField
class. The superclass should be consulted for additional capabilities.
JTextField has a method to establish the string used as the
command string for the action event that gets fired. The
java.awt.TextField used the text of the field as the command
string for the ActionEvent.
JTextField will use the command
string set with the setActionCommand method if not null,
otherwise it will use the text of the field as a compatibility with
java.awt.TextField.
The method setEchoChar and getEchoChar
are not provided directly to avoid a new implementation of a
pluggable look-and-feel inadvertently exposing password characters.
To provide password-like services a separate class JPasswordField
extends JTextField to provide this service with an independently
pluggable look-and-feel.
The java.awt.TextField could be monitored for changes by adding
a TextListener for TextEvent's.
In the JTextComponent based
components, changes are broadcasted from the model via a
DocumentEvent to DocumentListeners.
The DocumentEvent gives
the location of the change and the kind of change if desired.
The code fragment might look something like:
DocumentListener myListener = ??;
JTextField myArea = ??;
myArea.getDocument().addDocumentListener(myListener);
The horizontal alignment of JTextField can be set to be left
justified, leading justified, centered, right justified or trailing justified.
Right/trailing justification is useful if the required size
of the field text is smaller than the size allocated to it.
This is determined by the setHorizontalAlignment
and getHorizontalAlignment methods. The default
is to be leading justified.
How the text field consumes VK_ENTER events depends on whether the text field has any action listeners. If so, then VK_ENTER results in the listeners getting an ActionEvent, and the VK_ENTER event is consumed. This is compatible with how AWT text fields handle VK_ENTER events. If the text field has no action listeners, then as of v 1.3 the VK_ENTER event is not consumed. Instead, the bindings of ancestor components are processed, which enables the default button feature of JFC/Swing to work.
Customized fields can easily be created by extending the model and changing the default model provided. For example, the following piece of code will create a field that holds only upper case characters. It will work even if text is pasted into from the clipboard or it is altered via programmatic changes.
public class UpperCaseField extends JTextField {
public UpperCaseField(int cols) {
super(cols);
}
protected Document createDefaultModel() {
return new UpperCaseDocument();
}
static class UpperCaseDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException {
if (str == null) {
return;
}
char[] upper = str.toCharArray();
for (int i = 0; i < upper.length; i++) {
upper[i] = Character.toUpperCase(upper[i]);
}
super.insertString(offs, new String(upper), a);
}
}
}
Warning: Swing is not thread safe. For more information see Swing's Threading Policy.
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.
| Modifier and Type | Class and Description |
|---|---|
protected class |
JTextField.AccessibleJTextField
This class implements accessibility support for the
JTextField class. |
JTextComponent.AccessibleJTextComponent, JTextComponent.DropLocation, JTextComponent.KeyBindingJComponent.AccessibleJComponentContainer.AccessibleAWTContainerComponent.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy| Modifier and Type | Field and Description |
|---|---|
static String |
notifyAction
Name of the action to send notification that the
contents of the field have been accepted.
|
DEFAULT_KEYMAP, FOCUS_ACCELERATOR_KEYlistenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOWaccessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENTBOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WESTABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH| Constructor and Description |
|---|
JTextField()
Constructs a new
TextField. |
JTextField(Document doc,
String text,
int columns)
Constructs a new
JTextField that uses the given text
storage model and the given number of columns. |
JTextField(int columns)
Constructs a new empty
TextField with the specified
number of columns. |
JTextField(String text)
Constructs a new
TextField initialized with the
specified text. |
JTextField(String text,
int columns)
Constructs a new
TextField initialized with the
specified text and columns. |
| Modifier and Type | Method and Description |
|---|---|
protected void |
actionPropertyChanged(Action action,
String propertyName)
Updates the textfield's state in response to property changes in
associated action.
|
void |
addActionListener(ActionListener l)
Adds the specified action listener to receive
action events from this textfield.
|
protected void |
configurePropertiesFromAction(Action a)
Sets the properties on this textfield to match those in the specified
Action. |
protected PropertyChangeListener |
createActionPropertyChangeListener(Action a)
Creates and returns a
PropertyChangeListener that is
responsible for listening for changes from the specified
Action and updating the appropriate properties. |
protected Document |
createDefaultModel()
Creates the default implementation of the model
to be used at construction if one isn't explicitly
given.
|
protected void |
fireActionPerformed()
Notifies all listeners that have registered interest for
notification on this event type.
|
AccessibleContext |
getAccessibleContext()
Gets the
AccessibleContext associated with this
JTextField. |
Action |
getAction()
Returns the currently set
Action for this
ActionEvent source, or null
if no Action is set. |
ActionListener[] |
getActionListeners()
Returns an array of all the
ActionListeners added
to this JTextField with addActionListener(). |
Action[] |
getActions()
Fetches the command list for the editor.
|
int |
getColumns()
Returns the number of columns in this
TextField. |
protected int |
getColumnWidth()
Returns the column width.
|
int |
getHorizontalAlignment()
Returns the horizontal alignment of the text.
|
BoundedRangeModel |
getHorizontalVisibility()
Gets the visibility of the text field.
|
Dimension |
getPreferredSize()
Returns the preferred size
Dimensions needed for this
TextField. |
int |
getScrollOffset()
Gets the scroll offset, in pixels.
|
String |
getUIClassID()
Gets the class ID for a UI.
|
boolean |
isValidateRoot()
Calls to
revalidate that come from within the
textfield itself will
be handled by validating the textfield, unless the textfield
is contained within a JViewport,
in which case this returns false. |
protected String |
paramString()
Returns a string representation of this
JTextField. |
void |
postActionEvent()
Processes action events occurring on this textfield by
dispatching them to any registered
ActionListener objects. |
void |
removeActionListener(ActionListener l)
Removes the specified action listener so that it no longer
receives action events from this textfield.
|
void |
scrollRectToVisible(Rectangle r)
Scrolls the field left or right.
|
void |
setAction(Action a)
Sets the
Action for the ActionEvent source. |
void |
setActionCommand(String command)
Sets the command string used for action events.
|
void |
setColumns(int columns)
Sets the number of columns in this
TextField,
and then invalidate the layout. |
void |
setDocument(Document doc)
Associates the editor with a text document.
|
void |
setFont(Font f)
Sets the current font.
|
void |
setHorizontalAlignment(int alignment)
Sets the horizontal alignment of the text.
|
void |
setScrollOffset(int scrollOffset)
Sets the scroll offset, in pixels.
|
addCaretListener, addInputMethodListener, addKeymap, copy, cut, fireCaretUpdate, getCaret, getCaretColor, getCaretListeners, getCaretPosition, getDisabledTextColor, getDocument, getDragEnabled, getDropLocation, getDropMode, getFocusAccelerator, getHighlighter, getInputMethodRequests, getKeymap, getKeymap, getMargin, getNavigationFilter, getPreferredScrollableViewportSize, getPrintable, getScrollableBlockIncrement, getScrollableTracksViewportHeight, getScrollableTracksViewportWidth, getScrollableUnitIncrement, getSelectedText, getSelectedTextColor, getSelectionColor, getSelectionEnd, getSelectionStart, getText, getText, getToolTipText, getUI, isEditable, loadKeymap, modelToView, moveCaretPosition, paste, print, print, print, processInputMethodEvent, read, removeCaretListener, removeKeymap, removeNotify, replaceSelection, restoreComposedText, saveComposedText, select, selectAll, setCaret, setCaretColor, setCaretPosition, setComponentOrientation, setDisabledTextColor, setDragEnabled, setDropMode, setEditable, setFocusAccelerator, setHighlighter, setKeymap, setMargin, setNavigationFilter, setSelectedTextColor, setSelectionColor, setSelectionEnd, setSelectionStart, setText, setUI, updateUI, viewToModel, writeaddAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, updateadd, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTreeaction, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCyclepublic static final String notifyAction
public JTextField()
TextField. A default model is created,
the initial string is null,
and the number of columns is set to 0.public JTextField(String text)
TextField initialized with the
specified text. A default model is created and the number of
columns is 0.text - the text to be displayed, or nullpublic JTextField(int columns)
TextField with the specified
number of columns.
A default model is created and the initial string is set to
null.columns - the number of columns to use to calculate
the preferred width; if columns is set to zero, the
preferred width will be whatever naturally results from
the component implementationpublic JTextField(String text, int columns)
TextField initialized with the
specified text and columns. A default model is created.text - the text to be displayed, or nullcolumns - the number of columns to use to calculate
the preferred width; if columns is set to zero, the
preferred width will be whatever naturally results from
the component implementationpublic JTextField(Document doc, String text, int columns)
JTextField that uses the given text
storage model and the given number of columns.
This is the constructor through which the other constructors feed.
If the document is null, a default model is created.doc - the text storage to use; if this is null,
a default will be provided by calling the
createDefaultModel methodtext - the initial string to display, or nullcolumns - the number of columns to use to calculate
the preferred width >= 0; if columns
is set to zero, the preferred width will be whatever
naturally results from the component implementationIllegalArgumentException - if columns < 0public String getUIClassID()
getUIClassID in class JComponentJComponent.getUIClassID(),
UIDefaults.getUI(javax.swing.JComponent)public void setDocument(Document doc)
setDocument in class JTextComponentdoc - the document to display/editJTextComponent.getDocument()public boolean isValidateRoot()
revalidate that come from within the
textfield itself will
be handled by validating the textfield, unless the textfield
is contained within a JViewport,
in which case this returns false.isValidateRoot in class JComponentJViewPort
return false, otherwise return trueJComponent.revalidate(),
JComponent.isValidateRoot(),
Container.isValidateRoot()public int getHorizontalAlignment()
JTextField.LEFT
JTextField.CENTER
JTextField.RIGHT
JTextField.LEADING
JTextField.TRAILING
public void setHorizontalAlignment(int alignment)
JTextField.LEFT
JTextField.CENTER
JTextField.RIGHT
JTextField.LEADING
JTextField.TRAILING
invalidate and repaint are called when the
alignment is set,
and a PropertyChange event ("horizontalAlignment") is fired.alignment - the alignmentIllegalArgumentException - if alignment
is not a valid keyprotected Document createDefaultModel()
PlainDocument is returned.public int getColumns()
TextField.public void setColumns(int columns)
TextField,
and then invalidate the layout.columns - the number of columns >= 0IllegalArgumentException - if columns
is less than 0protected int getColumnWidth()
public Dimension getPreferredSize()
Dimensions needed for this
TextField. If a non-zero number of columns has been
set, the width is set to the columns multiplied by
the column width.getPreferredSize in class JComponentJComponent.setPreferredSize(java.awt.Dimension),
ComponentUIpublic void setFont(Font f)
revalidate is called after setting the font.setFont in class JComponentf - the new fontComponent.getFont()public void addActionListener(ActionListener l)
l - the action listener to be addedpublic void removeActionListener(ActionListener l)
l - the action listener to be removedpublic ActionListener[] getActionListeners()
ActionListeners added
to this JTextField with addActionListener().ActionListeners added or an empty
array if no listeners have been addedprotected void fireActionPerformed()
EventListenerListpublic void setActionCommand(String command)
command - the command stringpublic void setAction(Action a)
Action for the ActionEvent source.
The new Action replaces
any previously set Action but does not affect
ActionListeners independently
added with addActionListener.
If the Action is already a registered
ActionListener
for the ActionEvent source, it is not re-registered.
Setting the Action results in immediately changing
all the properties described in
Swing Components Supporting Action.
Subsequently, the textfield's properties are automatically updated
as the Action's properties change.
This method uses three other methods to set
and help track the Action's property values.
It uses the configurePropertiesFromAction method
to immediately change the textfield's properties.
To track changes in the Action's property values,
this method registers the PropertyChangeListener
returned by createActionPropertyChangeListener. The
default PropertyChangeListener invokes the
actionPropertyChanged method when a property in the
Action changes.
a - the Action for the JTextField,
or nullAction,
getAction(),
configurePropertiesFromAction(javax.swing.Action),
createActionPropertyChangeListener(javax.swing.Action),
actionPropertyChanged(javax.swing.Action, java.lang.String)public Action getAction()
Action for this
ActionEvent source, or null
if no Action is set.Action for this ActionEvent source,
or nullAction,
setAction(javax.swing.Action)protected void configurePropertiesFromAction(Action a)
Action. Refer to
Swing Components Supporting Action for more
details as to which properties this sets.a - the Action from which to get the properties,
or nullAction,
setAction(javax.swing.Action)protected void actionPropertyChanged(Action action, String propertyName)
PropertyChangeListener returned from
createActionPropertyChangeListener. Subclasses do not normally
need to invoke this. Subclasses that support additional Action
properties should override this and
configurePropertiesFromAction.
Refer to the table at
Swing Components Supporting Action for a list of
the properties this method sets.
action - the Action associated with this textfieldpropertyName - the name of the property that changedAction,
configurePropertiesFromAction(javax.swing.Action)protected PropertyChangeListener createActionPropertyChangeListener(Action a)
PropertyChangeListener that is
responsible for listening for changes from the specified
Action and updating the appropriate properties.
Warning: If you subclass this do not create an anonymous
inner class. If you do the lifetime of the textfield will be tied to
that of the Action.
a - the textfield's actionAction,
setAction(javax.swing.Action)public Action[] getActions()
getActions in class JTextComponentpublic void postActionEvent()
ActionListener objects.
This is normally called by the controller registered with
textfield.public BoundedRangeModel getHorizontalVisibility()
The fields look-and-feel implementation manages
the values of the minimum, maximum, and extent
properties on the BoundedRangeModel.
BoundedRangeModelpublic int getScrollOffset()
public void setScrollOffset(int scrollOffset)
scrollOffset - the offset >= 0public void scrollRectToVisible(Rectangle r)
scrollRectToVisible in class JComponentr - the region to scrollJViewportprotected String paramString()
JTextField.
This method is intended to be used only for debugging purposes,
and the content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.paramString in class JTextComponentJTextFieldpublic AccessibleContext getAccessibleContext()
AccessibleContext associated with this
JTextField. For JTextFields,
the AccessibleContext takes the form of an
AccessibleJTextField.
A new AccessibleJTextField instance is created
if necessary.getAccessibleContext in interface AccessiblegetAccessibleContext in class JTextComponentAccessibleJTextField that serves as the
AccessibleContext of this JTextField 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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