java.lang.Object
java.awt.Component
java.awt.TextComponent
java.awt.TextField
public class TextField
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.
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
TextField()
TextField(int columns)
TextField(String text)
TextField(String text, int columns)
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 TextField
public TextField()
throws HeadlessException
HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
GraphicsEnvironment.isHeadless()
public TextField(String text)
throws HeadlessException
text - the text to be displayed. If text is null, the empty string "" will be displayed.
HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
GraphicsEnvironment.isHeadless()
public TextField(int columns)
throws HeadlessException
columns - the number of columns. If columns is less than 0, columns is set to 0.
HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
GraphicsEnvironment.isHeadless()
public TextField(String text,
int columns)
throws HeadlessException
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.
HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
GraphicsEnvironment.isHeadless()
public void addNotify()
addNotify in class TextComponent
TextComponent.removeNotify()
public char getEchoChar()
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.
echoCharIsSet(), setEchoChar(char)
public void setEchoChar(char c)
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.
c - the echo character for this text field.
echoCharIsSet(), getEchoChar()
@Deprecated public void setEchoCharacter(char c)
setEchoChar(char).
public void setText(String t)
setText in class TextComponent
t - the new text.
TextComponent.getText()
public boolean echoCharIsSet()
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.
true if this text field has a character set for echoing; false otherwise.
setEchoChar(char), getEchoChar()
public int getColumns()
setColumns(int)
public void setColumns(int columns)
columns - the number of columns.
IllegalArgumentException - if the value supplied for columns is less than 0.
getColumns()
public Dimension getPreferredSize(int columns)
columns - the number of columns in this text field.
@Deprecated public Dimension preferredSize(int columns)
getPreferredSize(int).
public Dimension getPreferredSize()
getPreferredSize in class Component
Component.getMinimumSize(), LayoutManager
@Deprecated public Dimension preferredSize()
getPreferredSize().
preferredSize in class Component
public Dimension getMinimumSize(int columns)
columns - the number of columns in this text field.
@Deprecated public Dimension minimumSize(int columns)
getMinimumSize(int).
public Dimension getMinimumSize()
getMinimumSize in class Component
Component.getPreferredSize(), LayoutManager
@Deprecated public Dimension minimumSize()
getMinimumSize().
minimumSize in class Component
public void addActionListener(ActionListener l)
l - the action listener.
removeActionListener(java.awt.event.ActionListener), getActionListeners(), ActionListener
public void removeActionListener(ActionListener l)
l - the action listener.
addActionListener(java.awt.event.ActionListener), getActionListeners(), ActionListener
public ActionListener[] getActionListeners()
ActionListeners or an empty array if no action listeners are currently registered
addActionListener(java.awt.event.ActionListener), removeActionListener(java.awt.event.ActionListener), java.awt.event
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
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.
getListeners in class TextComponent
listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
FooListeners on this textfield, or an empty array if no such listeners have been added
ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener
getActionListeners()
protected void processEvent(AWTEvent e)
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.
processEvent in class TextComponent
e - the event
ActionEvent, processActionEvent(java.awt.event.ActionEvent)
protected void processActionEvent(ActionEvent e)
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:
ActionListener object is registered via addActionListener.enableEvents.Note that if the event parameter is null the behavior is unspecified and may result in an exception.
e - the action event
ActionListener, addActionListener(java.awt.event.ActionListener), Component.enableEvents(long)
protected String paramString()
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.
paramString in class TextComponent
public AccessibleContext getAccessibleContext()
getAccessibleContext in interface Accessible
getAccessibleContext in class TextComponent
Copyright © 2004, 2010 Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4