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java.awt
Class TextField
java.lang.Object
java.awt.Component
java.awt.TextComponent
java.awt.TextField
-
All Implemented Interfaces:
-
ImageObserver
,
MenuContainer
,
Serializable
,
Accessible
-
public class TextField
- extends TextComponent
A TextField object is a text component that allows for the editing of a single line of text.
For example, the following image depicts a frame with four text fields of varying widths. Two of these text fields display the predefined text "Hello".
Here is the code that produces these four text fields:
TextField tf1, tf2, tf3, tf4;
// a blank text field
tf1 = new TextField();
// blank field of 20 columns
tf2 = new TextField("", 20);
// predefined text displayed
tf3 = new TextField("Hello!");
// predefined text in 30 columns
tf4 = new TextField("Hello", 30);
Every time the user types a key in the text field, one or more key events are sent to the text field. A KeyEvent may be one of three types: keyPressed, keyReleased, or keyTyped. The properties of a key event indicate which of these types it is, as well as additional information about the event, such as what modifiers are applied to the key event and the time at which the event occurred.
The key event is passed to every KeyListener or KeyAdapter object which registered to receive such events using the component's addKeyListener method. (KeyAdapter objects implement the KeyListener interface.)
It is also possible to fire an ActionEvent. If action events are enabled for the text field, they may be fired by pressing the Return key.
The TextField class's processEvent method examines the action event and passes it along to processActionEvent. The latter method redirects the event to any ActionListener objects that have registered to receive action events generated by this text field.
-
Since:
-
JDK1.0
-
See Also:
-
KeyEvent
,
KeyAdapter
,
KeyListener
,
ActionEvent
,
Component.addKeyListener(java.awt.event.KeyListener)
,
processEvent(java.awt.AWTEvent)
,
processActionEvent(java.awt.event.ActionEvent)
,
addActionListener(java.awt.event.ActionListener)
,
Serialized Form
Nested Class Summary
|
protected class |
TextField.AccessibleAWTTextField
This class implements accessibility support for the TextField class. |
Nested classes/interfaces inherited from class java.awt.
TextComponent
|
TextComponent.AccessibleAWTTextComponent
|
Nested classes/interfaces inherited from class java.awt.
Component
|
Component.AccessibleAWTComponent
,
Component.BltBufferStrategy
,
Component.FlipBufferStrategy
|
Fields inherited from class java.awt.
TextComponent
|
textListener
|
Fields inherited from interface java.awt.image.
ImageObserver
|
ABORT
,
ALLBITS
,
ERROR
,
FRAMEBITS
,
HEIGHT
,
PROPERTIES
,
SOMEBITS
,
WIDTH
|
Constructor Summary
|
TextField
()
Constructs a new text field. |
TextField
(int columns)
Constructs a new empty text field with the specified number of columns. |
TextField
(
String
text)
Constructs a new text field initialized with the specified text. |
TextField
(
String
text, int columns)
Constructs a new text field initialized with the specified text to be displayed, and wide enough to hold the specified number of columns. |
Method Summary
|
void |
addActionListener
(
ActionListener
l)
Adds the specified action listener to receive action events from this text field. |
void |
addNotify
()
Creates the TextField's peer. |
boolean |
echoCharIsSet
()
Indicates whether or not this text field has a character set for echoing. |
AccessibleContext
|
getAccessibleContext
()
Gets the AccessibleContext associated with this TextField. |
ActionListener
[] |
getActionListeners
()
Returns an array of all the action listeners registered on this textfield. |
int |
getColumns
()
Gets the number of columns in this text field. |
char |
getEchoChar
()
Gets the character that is to be used for echoing. |
<T extends
EventListener
>
T[] |
|
getListeners
(
Class
<T> listenerType)
Returns an array of all the objects currently registered as FooListeners upon this TextField. |
Dimension
|
getMinimumSize
()
Gets the minumum dimensions for this text field. |
Dimension
|
getMinimumSize
(int columns)
Gets the minumum dimensions for a text field with the specified number of columns. |
Dimension
|
getPreferredSize
()
Gets the preferred size of this text field. |
Dimension
|
getPreferredSize
(int columns)
Gets the preferred size of this text field with the specified number of columns. |
Dimension
|
minimumSize
()
Deprecated.
As of JDK version 1.1, replaced by getMinimumSize().
|
Dimension
|
minimumSize
(int columns)
Deprecated.
As of JDK version 1.1, replaced by getMinimumSize(int).
|
protected
String
|
paramString
()
Returns a string representing the state of this TextField. |
Dimension
|
preferredSize
()
Deprecated.
As of JDK version 1.1, replaced by getPreferredSize().
|
Dimension
|
preferredSize
(int columns)
Deprecated.
As of JDK version 1.1, replaced by getPreferredSize(int).
|
protected void |
processActionEvent
(
ActionEvent
e)
Processes action events occurring on this text field by dispatching them to any registered ActionListener objects. |
protected void |
processEvent
(
AWTEvent
e)
Processes events on this text field. |
void |
removeActionListener
(
ActionListener
l)
Removes the specified action listener so that it no longer receives action events from this text field. |
void |
setColumns
(int columns)
Sets the number of columns in this text field. |
void |
setEchoChar
(char c)
Sets the echo character for this text field. |
void |
setEchoCharacter
(char c)
Deprecated.
As of JDK version 1.1, replaced by setEchoChar(char).
|
void |
setText
(
String
t)
Sets the text that is presented by this text component to be the specified text. |
Methods inherited from class java.awt.
TextComponent
|
addTextListener
,
enableInputMethods
,
getBackground
,
getCaretPosition
,
getInputMethodRequests
,
getSelectedText
,
getSelectionEnd
,
getSelectionStart
,
getText
,
getTextListeners
,
isEditable
,
processTextEvent
,
removeNotify
,
removeTextListener
,
select
,
selectAll
,
setBackground
,
setCaretPosition
,
setEditable
,
setSelectionEnd
,
setSelectionStart
|
Methods inherited from class java.awt.
Component
|
action
,
add
,
addComponentListener
,
addFocusListener
,
addHierarchyBoundsListener
,
addHierarchyListener
,
addInputMethodListener
,
addKeyListener
,
addMouseListener
,
addMouseMotionListener
,
addMouseWheelListener
,
addPropertyChangeListener
,
addPropertyChangeListener
,
applyComponentOrientation
,
areFocusTraversalKeysSet
,
bounds
,
checkImage
,
checkImage
,
coalesceEvents
,
contains
,
contains
,
createImage
,
createImage
,
createVolatileImage
,
createVolatileImage
,
deliverEvent
,
disable
,
disableEvents
,
dispatchEvent
,
doLayout
,
enable
,
enable
,
enableEvents
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
getAlignmentX
,
getAlignmentY
,
getBounds
,
getBounds
,
getColorModel
,
getComponentAt
,
getComponentAt
,
getComponentListeners
,
getComponentOrientation
,
getCursor
,
getDropTarget
,
getFocusCycleRootAncestor
,
getFocusListeners
,
getFocusTraversalKeys
,
getFocusTraversalKeysEnabled
,
getFont
,
getFontMetrics
,
getForeground
,
getGraphics
,
getGraphicsConfiguration
,
getHeight
,
getHierarchyBoundsListeners
,
getHierarchyListeners
,
getIgnoreRepaint
,
getInputContext
,
getInputMethodListeners
,
getKeyListeners
,
getLocale
,
getLocation
,
getLocation
,
getLocationOnScreen
,
getMaximumSize
,
getMouseListeners
,
getMouseMotionListeners
,
getMousePosition
,
getMouseWheelListeners
,
getName
,
getParent
,
getPeer
,
getPropertyChangeListeners
,
getPropertyChangeListeners
,
getSize
,
getSize
,
getToolkit
,
getTreeLock
,
getWidth
,
getX
,
getY
,
gotFocus
,
handleEvent
,
hasFocus
,
hide
,
imageUpdate
,
inside
,
invalidate
,
isBackgroundSet
,
isCursorSet
,
isDisplayable
,
isDoubleBuffered
,
isEnabled
,
isFocusable
,
isFocusCycleRoot
,
isFocusOwner
,
isFocusTraversable
,
isFontSet
,
isForegroundSet
,
isLightweight
,
isMaximumSizeSet
,
isMinimumSizeSet
,
isOpaque
,
isPreferredSizeSet
,
isShowing
,
isValid
,
isVisible
,
keyDown
,
keyUp
,
layout
,
list
,
list
,
list
,
list
,
list
,
locate
,
location
,
lostFocus
,
mouseDown
,
mouseDrag
,
mouseEnter
,
mouseExit
,
mouseMove
,
mouseUp
,
move
,
nextFocus
,
paint
,
paintAll
,
postEvent
,
prepareImage
,
prepareImage
,
print
,
printAll
,
processComponentEvent
,
processFocusEvent
,
processHierarchyBoundsEvent
,
processHierarchyEvent
,
processInputMethodEvent
,
processKeyEvent
,
processMouseEvent
,
processMouseMotionEvent
,
processMouseWheelEvent
,
remove
,
removeComponentListener
,
removeFocusListener
,
removeHierarchyBoundsListener
,
removeHierarchyListener
,
removeInputMethodListener
,
removeKeyListener
,
removeMouseListener
,
removeMouseMotionListener
,
removeMouseWheelListener
,
removePropertyChangeListener
,
removePropertyChangeListener
,
repaint
,
repaint
,
repaint
,
repaint
,
requestFocus
,
requestFocus
,
requestFocusInWindow
,
requestFocusInWindow
,
reshape
,
resize
,
resize
,
setBounds
,
setBounds
,
setComponentOrientation
,
setCursor
,
setDropTarget
,
setEnabled
,
setFocusable
,
setFocusTraversalKeys
,
setFocusTraversalKeysEnabled
,
setFont
,
setForeground
,
setIgnoreRepaint
,
setLocale
,
setLocation
,
setLocation
,
setMaximumSize
,
setMinimumSize
,
setName
,
setPreferredSize
,
setSize
,
setSize
,
setVisible
,
show
,
show
,
size
,
toString
,
transferFocus
,
transferFocusBackward
,
transferFocusUpCycle
,
update
,
validate
|
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
wait
,
wait
,
wait
|
TextField
public TextField()
throws HeadlessException
-
Constructs a new text field.
-
Throws:
-
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.
-
See Also:
-
GraphicsEnvironment.isHeadless()
TextField
public TextField(String text)
throws HeadlessException
-
Constructs a new text field initialized with the specified text.
-
Parameters:
-
text - the text to be displayed. If text is null, the empty string "" will be displayed.
-
Throws:
-
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.
-
See Also:
-
GraphicsEnvironment.isHeadless()
TextField
public TextField(int columns)
throws HeadlessException
-
Constructs a new empty text field with the specified number of columns. A column is an approximate average character width that is platform-dependent.
-
Parameters:
-
columns - the number of columns. If columns is less than 0, columns is set to 0.
-
Throws:
-
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.
-
See Also:
-
GraphicsEnvironment.isHeadless()
TextField
public TextField(String text,
int columns)
throws HeadlessException
-
Constructs a new text field initialized with the specified text to be displayed, and wide enough to hold the specified number of columns. A column is an approximate average character width that is platform-dependent.
-
Parameters:
-
text - the text to be displayed. If text is null, the empty string "" will be displayed.
-
columns - the number of columns. If columns is less than 0, columns is set to 0.
-
Throws:
-
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.
-
See Also:
-
GraphicsEnvironment.isHeadless()
addNotify
public void addNotify()
-
Creates the TextField's peer. The peer allows us to modify the appearance of the TextField without changing its functionality.
-
-
Overrides:
-
addNotify
in class
TextComponent
-
-
See Also:
-
TextComponent.removeNotify()
getEchoChar
public char getEchoChar()
-
Gets the character that is to be used for echoing.
An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password. If echoChar = 0, user input is echoed to the screen unchanged.
-
-
Returns:
-
the echo character for this text field.
-
See Also:
-
echoCharIsSet()
,
setEchoChar(char)
setEchoChar
public void setEchoChar(char c)
-
Sets the echo character for this text field.
An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password. Setting echoChar = 0 allows user input to be echoed to the screen again.
-
-
Parameters:
-
c - the echo character for this text field.
-
Since:
-
JDK1.1
-
See Also:
-
echoCharIsSet()
,
getEchoChar()
setEchoCharacter
@Deprecated
public void setEchoCharacter(char c)
-
Deprecated.
As of JDK version 1.1, replaced by setEchoChar(char).
-
setText
public void setText(String t)
-
Sets the text that is presented by this text component to be the specified text.
-
-
Overrides:
-
setText
in class
TextComponent
-
-
Parameters:
-
t - the new text.
-
See Also:
-
TextComponent.getText()
echoCharIsSet
public boolean echoCharIsSet()
-
Indicates whether or not this text field has a character set for echoing.
An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password.
-
-
Returns:
-
true if this text field has a character set for echoing; false otherwise.
-
See Also:
-
setEchoChar(char)
,
getEchoChar()
getColumns
public int getColumns()
-
Gets the number of columns in this text field. A column is an approximate average character width that is platform-dependent.
-
-
Returns:
-
the number of columns.
-
Since:
-
JDK1.1
-
See Also:
-
setColumns(int)
setColumns
public void setColumns(int columns)
-
Sets the number of columns in this text field. A column is an approximate average character width that is platform-dependent.
-
-
Parameters:
-
columns - the number of columns.
-
Throws:
-
IllegalArgumentException
- if the value supplied for columns is less than 0.
-
Since:
-
JDK1.1
-
See Also:
-
getColumns()
getPreferredSize
public Dimension getPreferredSize(int columns)
-
Gets the preferred size of this text field with the specified number of columns.
-
-
Parameters:
-
columns - the number of columns in this text field.
-
Returns:
-
the preferred dimensions for displaying this text field.
-
Since:
-
JDK1.1
preferredSize
@Deprecated
public DimensionpreferredSize(int columns)
-
Deprecated.
As of JDK version 1.1, replaced by getPreferredSize(int).
-
getPreferredSize
public Dimension getPreferredSize()
-
Gets the preferred size of this text field.
-
-
Overrides:
-
getPreferredSize
in class
Component
-
-
Returns:
-
the preferred dimensions for displaying this text field.
-
Since:
-
JDK1.1
-
See Also:
-
Component.getMinimumSize()
,
LayoutManager
preferredSize
@Deprecated
public DimensionpreferredSize()
-
Deprecated.
As of JDK version 1.1, replaced by getPreferredSize().
-
-
Overrides:
-
preferredSize
in class
Component
-
getMinimumSize
public Dimension getMinimumSize(int columns)
-
Gets the minumum dimensions for a text field with the specified number of columns.
-
-
Parameters:
-
columns - the number of columns in this text field.
-
Since:
-
JDK1.1
minimumSize
@Deprecated
public DimensionminimumSize(int columns)
-
Deprecated.
As of JDK version 1.1, replaced by getMinimumSize(int).
-
getMinimumSize
public Dimension getMinimumSize()
-
Gets the minumum dimensions for this text field.
-
-
Overrides:
-
getMinimumSize
in class
Component
-
-
Returns:
-
the minimum dimensions for displaying this text field.
-
Since:
-
JDK1.1
-
See Also:
-
Component.getPreferredSize()
,
LayoutManager
minimumSize
@Deprecated
public DimensionminimumSize()
-
Deprecated.
As of JDK version 1.1, replaced by getMinimumSize().
-
-
Overrides:
-
minimumSize
in class
Component
-
addActionListener
public void addActionListener(ActionListener l)
-
Adds the specified action listener to receive action events from this text field. If l is null, no exception is thrown and no action is performed.
-
-
Parameters:
-
l - the action listener.
-
Since:
-
JDK1.1
-
See Also:
-
removeActionListener(java.awt.event.ActionListener)
,
getActionListeners()
,
ActionListener
removeActionListener
public void removeActionListener(ActionListener l)
-
Removes the specified action listener so that it no longer receives action events from this text field. If l is null, no exception is thrown and no action is performed.
-
-
Parameters:
-
l - the action listener.
-
Since:
-
JDK1.1
-
See Also:
-
addActionListener(java.awt.event.ActionListener)
,
getActionListeners()
,
ActionListener
getActionListeners
public ActionListener[] getActionListeners()
-
Returns an array of all the action listeners registered on this textfield.
-
-
Returns:
-
all of this textfield's ActionListeners or an empty array if no action listeners are currently registered
-
Since:
-
1.4
-
See Also:
-
addActionListener(java.awt.event.ActionListener)
,
removeActionListener(java.awt.event.ActionListener)
,
java.awt.event
getListeners
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
-
Returns an array of all the objects currently registered as FooListeners upon this TextField. FooListeners are registered using the addFooListener method.
You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a TextField t for its action listeners with the following code:
ActionListener[] als = (ActionListener[])(t.getListeners(ActionListener.class));
If no such listeners exist, this method returns an empty array.
-
-
Overrides:
-
getListeners
in class
TextComponent
-
-
Parameters:
-
listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
-
Returns:
-
an array of all objects registered as FooListeners on this textfield, or an empty array if no such listeners have been added
-
Throws:
-
ClassCastException
- if listenerType doesn't specify a class or interface that implements java.util.EventListener
-
Since:
-
1.3
-
See Also:
-
getActionListeners()
processEvent
protected void processEvent(AWTEvent e)
-
Processes events on this text field. If the event is an instance of ActionEvent, it invokes the processActionEvent method. Otherwise, it invokes processEvent on the superclass.
Note that if the event parameter is null the behavior is unspecified and may result in an exception.
-
-
Overrides:
-
processEvent
in class
TextComponent
-
-
Parameters:
-
e - the event
-
Since:
-
JDK1.1
-
See Also:
-
ActionEvent
,
processActionEvent(java.awt.event.ActionEvent)
processActionEvent
protected void processActionEvent(ActionEvent e)
-
Processes action events occurring on this text field by dispatching them to any registered ActionListener objects.
This method is not called unless action events are enabled for this component. Action events are enabled when one of the following occurs:
-
An ActionListener object is registered via addActionListener.
-
Action events are enabled via enableEvents.
Note that if the event parameter is null the behavior is unspecified and may result in an exception.
-
-
Parameters:
-
e - the action event
-
Since:
-
JDK1.1
-
See Also:
-
ActionListener
,
addActionListener(java.awt.event.ActionListener)
,
Component.enableEvents(long)
paramString
protected String paramString()
-
Returns a string representing the state of this TextField. 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.
-
-
Overrides:
-
paramString
in class
TextComponent
-
-
Returns:
-
the parameter string of this text field
getAccessibleContext
public AccessibleContext getAccessibleContext()
-
Gets the AccessibleContext associated with this TextField. For text fields, the AccessibleContext takes the form of an AccessibleAWTTextField. A new AccessibleAWTTextField instance is created if necessary.
-
-
Specified by:
-
getAccessibleContext
in interface
Accessible
-
Overrides:
-
getAccessibleContext
in class
TextComponent
-
-
Returns:
-
an AccessibleAWTTextField that serves as the AccessibleContext of this TextField