JavaTM 2 Platform
Std. Ed. v1.3.1

javax.swing
Class JDialog

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Dialog
                          |
                          +--javax.swing.JDialog
All Implemented Interfaces:
Accessible, ImageObserver, MenuContainer, RootPaneContainer, Serializable, WindowConstants

public class JDialog
extends Dialog
implements WindowConstants, Accessible, RootPaneContainer

The main class for creating a dialog window. You can use this class to create a custom dialog, or invoke the many class methods in JOptionPane to create a variety of standard dialogs. For information about creating dialogs, see The Java Tutorial section How to Make Dialogs.

The JDialog component contains a JRootPane as its only child. The contentPane should be the parent of any children of the JDialog. From the older java.awt.Window object you would normally do something like this:

       dialog.add(child);
 
Using JDialog the proper semantic is:
       dialog.getContentPane().add(child);
 
The same priniciple holds true for setting layout managers, removing components, listing children, etc. All these methods should normally be sent to the contentPane instead of to the JDialog. The contentPane is always non-null. Attempting to set it to null generates an exception. The default contentPane has a BorderLayout manager set on it.

Please see the JRootPane documentation for a complete description of the contentPane, glassPane, and layeredPane components.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JDialog key assignments.

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. A future release of Swing will provide support for long term persistence.

See Also:
JOptionPane, JRootPane, Serialized Form

Inner Class Summary
protected  class JDialog.AccessibleJDialog
          This class implements accessibility support for the JDialog class.
 
Inner classes inherited from class java.awt.Dialog
Dialog.AccessibleAWTDialog
 
Inner classes inherited from class java.awt.Window
Window.AccessibleAWTWindow
 
Inner classes inherited from class java.awt.Container
Container.AccessibleAWTContainer
 
Inner classes inherited from class java.awt.Component
Component.AccessibleAWTComponent
 
Field Summary
protected  AccessibleContext accessibleContext
           
protected  JRootPane rootPane
           
protected  boolean rootPaneCheckingEnabled
           
 
Fields inherited from class java.awt.Component
BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
 
Fields inherited from interface javax.swing.WindowConstants
DISPOSE_ON_CLOSE, DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE
 
Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
 
Constructor Summary
JDialog()
          Creates a non-modal dialog without a title and without a specified Frame owner.
JDialog(Dialog owner)
          Creates a non-modal dialog without a title with the specifed Dialog as its owner.
JDialog(Dialog owner, boolean modal)
          Creates a modal or non-modal dialog without a title and with the specified owner dialog.
JDialog(Dialog owner, String title)
          Creates a non-modal dialog with the specified title and with the specified owner dialog.
JDialog(Dialog owner, String title, boolean modal)
          Creates a modal or non-modal dialog with the specified title and the specified owner frame.
JDialog(Frame owner)
          Creates a non-modal dialog without a title with the specifed Frame as its owner.
JDialog(Frame owner, boolean modal)
          Creates a modal or non-modal dialog without a title and with the specified owner Frame.
JDialog(Frame owner, String title)
          Creates a non-modal dialog with the specified title and with the specified owner frame.
JDialog(Frame owner, String title, boolean modal)
          Creates a modal or non-modal dialog with the specified title and the specified owner Frame.
 
Method Summary
protected  void addImpl(Component comp, Object constraints, int index)
          By default, children may not be added directly to a this component, they must be added to its contentPane instead.
protected  JRootPane createRootPane()
          Called by the constructor methods to create the default rootPane.
protected  void dialogInit()
          Called by the constructors to init the JDialog properly.
 AccessibleContext getAccessibleContext()
          Gets the AccessibleContext associated with this JDialog.
 Container getContentPane()
          Returns the contentPane object for this dialog.
 int getDefaultCloseOperation()
          Returns the operation which occurs when the user initiates a "close" on this dialog.
 Component getGlassPane()
          Returns the glassPane object for this dialog.
 JMenuBar getJMenuBar()
          Returns the menubar set on this dialog.
 JLayeredPane getLayeredPane()
          Returns the layeredPane object for this dialog.
 JRootPane getRootPane()
          Returns the rootPane object for this dialog.
protected  boolean isRootPaneCheckingEnabled()
          Returns true if the methods add and setLayout should be checked.
protected  String paramString()
          Returns a string representation of this JDialog.
protected  void processKeyEvent(KeyEvent e)
          Processes key events occurring on this component and, if appropriate, passes them on to components in the dialog which have registered interest in them.
protected  void processWindowEvent(WindowEvent e)
          Handles window events depending on the state of the defaultCloseOperation property.
 void remove(Component comp)
          Removes the specified component from this container.
 void setContentPane(Container contentPane)
          Sets the contentPane property.
 void setDefaultCloseOperation(int operation)
          Sets the operation which will happen by default when the user initiates a "close" on this dialog.
 void setGlassPane(Component glassPane)
          Sets the glassPane property.
 void setJMenuBar(JMenuBar menu)
          Sets the menubar for this dialog.
 void setLayeredPane(JLayeredPane layeredPane)
          Sets the layeredPane property.
 void setLayout(LayoutManager manager)
          By default the layout of this component may not be set, the layout of its contentPane should be set instead.
 void setLocationRelativeTo(Component c)
          Sets the location of the dialog relative to the specified component.
protected  void setRootPane(JRootPane root)
          Sets the rootPane property.
protected  void setRootPaneCheckingEnabled(boolean enabled)
          If true then calls to add and setLayout will cause an exception to be thrown.
 void update(Graphics g)
          Calls paint(g).
 
Methods inherited from class java.awt.Dialog
addNotify, dispose, getTitle, hide, isModal, isResizable, setModal, setResizable, setTitle, show
 
Methods inherited from class java.awt.Window
addWindowListener, applyResourceBundle, applyResourceBundle, finalize, getFocusOwner, getGraphicsConfiguration, getInputContext, getListeners, getLocale, getOwnedWindows, getOwner, getToolkit, getWarningString, isShowing, pack, postEvent, processEvent, removeWindowListener, setCursor, toBack, toFront
 
Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, removeNotify, setFont, validate, validateTree
 
Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

rootPane

protected JRootPane rootPane
See Also:
getRootPane(), setRootPane(javax.swing.JRootPane)

rootPaneCheckingEnabled

protected boolean rootPaneCheckingEnabled
See Also:
isRootPaneCheckingEnabled(), setRootPaneCheckingEnabled(boolean)

accessibleContext

protected AccessibleContext accessibleContext
Constructor Detail

JDialog

public JDialog()
Creates a non-modal dialog without a title and without a specified Frame owner. A shared, hidden frame will be set as the owner of the dialog.

JDialog

public JDialog(Frame owner)
Creates a non-modal dialog without a title with the specifed Frame as its owner.
Parameters:
owner - the Frame from which the dialog is displayed

JDialog

public JDialog(Frame owner,
               boolean modal)
Creates a modal or non-modal dialog without a title and with the specified owner Frame.
Parameters:
owner - the Frame from which the dialog is displayed
modal - true for a modal dialog, false for one that allows others windows to be active at the same time

JDialog

public JDialog(Frame owner,
               String title)
Creates a non-modal dialog with the specified title and with the specified owner frame.
Parameters:
owner - the Frame from which the dialog is displayed
title - the String to display in the dialog's title bar

JDialog

public JDialog(Frame owner,
               String title,
               boolean modal)
Creates a modal or non-modal dialog with the specified title and the specified owner Frame. All constructors defer to this one.

NOTE: Any popup components (JComboBox, JPopupMenu, JMenuBar) created within a modal dialog will be forced to be lightweight.

Parameters:
owner - the Frame from which the dialog is displayed
title - the String to display in the dialog's title bar
modal - true for a modal dialog, false for one that allows other windows to be active at the same time

JDialog

public JDialog(Dialog owner)
Creates a non-modal dialog without a title with the specifed Dialog as its owner.
Parameters:
owner - the Dialog from which the dialog is displayed

JDialog

public JDialog(Dialog owner,
               boolean modal)
Creates a modal or non-modal dialog without a title and with the specified owner dialog.

Parameters:
owner - the Dialog from which the dialog is displayed
modal - true for a modal dialog, false for one that allows other windows to be active at the same time

JDialog

public JDialog(Dialog owner,
               String title)
Creates a non-modal dialog with the specified title and with the specified owner dialog.
Parameters:
owner - the Dialog from which the dialog is displayed
title - the String to display in the dialog's title bar

JDialog

public JDialog(Dialog owner,
               String title,
               boolean modal)
Creates a modal or non-modal dialog with the specified title and the specified owner frame.
Parameters:
owner - the Dialog from which the dialog is displayed
title - the String to display in the dialog's title bar
modal - true for a modal dialog, false for one that allows other windows to be active at the same time
Method Detail

dialogInit

protected void dialogInit()
Called by the constructors to init the JDialog properly.

createRootPane

protected JRootPane createRootPane()
Called by the constructor methods to create the default rootPane.

processKeyEvent

protected void processKeyEvent(KeyEvent e)
Processes key events occurring on this component and, if appropriate, passes them on to components in the dialog which have registered interest in them.
Overrides:
processKeyEvent in class Component
Parameters:
e - the key event
See Also:
Component.processKeyEvent(java.awt.event.KeyEvent)

processWindowEvent

protected void processWindowEvent(WindowEvent e)
Handles window events depending on the state of the defaultCloseOperation property.
Overrides:
processWindowEvent in class Window
See Also:
setDefaultCloseOperation(int)

setDefaultCloseOperation

public void setDefaultCloseOperation(int operation)
Sets the operation which will happen by default when the user initiates a "close" on this dialog. The possible choices are:

The value is set to HIDE_ON_CLOSE by default.

See Also:
Window.addWindowListener(java.awt.event.WindowListener), getDefaultCloseOperation()

getDefaultCloseOperation

public int getDefaultCloseOperation()
Returns the operation which occurs when the user initiates a "close" on this dialog.
Returns:
an integer indicating the window-close operation
See Also:
setDefaultCloseOperation(int)

update

public void update(Graphics g)
Calls paint(g). This method was overridden to prevent an unneccessary call to clear the background.
Overrides:
update in class Container
Following copied from class: java.awt.Container
Parameters:
g - the specified Graphics window
See Also:
Component.update(java.awt.Graphics)

setJMenuBar

public void setJMenuBar(JMenuBar menu)
Sets the menubar for this dialog.
Parameters:
menubar - the menubar being placed in the dialog
See Also:
getJMenuBar()

getJMenuBar

public JMenuBar getJMenuBar()
Returns the menubar set on this dialog.
See Also:
setJMenuBar(javax.swing.JMenuBar)

isRootPaneCheckingEnabled

protected boolean isRootPaneCheckingEnabled()
Returns true if the methods add and setLayout should be checked.
Returns:
true if add and setLayout should be checked
See Also:
addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), setRootPaneCheckingEnabled(boolean)

setRootPaneCheckingEnabled

protected void setRootPaneCheckingEnabled(boolean enabled)
If true then calls to add and setLayout will cause an exception to be thrown.
See Also:
addImpl(java.awt.Component, java.lang.Object, int), setLayout(java.awt.LayoutManager), isRootPaneCheckingEnabled()

addImpl

protected void addImpl(Component comp,
                       Object constraints,
                       int index)
By default, children may not be added directly to a this component, they must be added to its contentPane instead. For example:
 thisComponent.getContentPane().add(child)
 
An attempt to add to directly to this component will cause an runtime exception to be thrown if rootPaneCheckingEnabled is true. Subclasses can disable this behavior.
Overrides:
addImpl in class Container
Parameters:
comp - the Component to be enhanced
constraints - the constraints to be respected
index - the index (an integer)
Throws:
Error - if called with rootPaneCheckingEnabled true
See Also:
setRootPaneCheckingEnabled(boolean)

remove

public void remove(Component comp)
Removes the specified component from this container.
Overrides:
remove in class Container
Parameters:
comp - the component to be removed
See Also:
Container.add(java.awt.Component)

setLayout

public void setLayout(LayoutManager manager)
By default the layout of this component may not be set, the layout of its contentPane should be set instead. For example:
 thisComponent.getContentPane().setLayout(new BorderLayout())
 
An attempt to set the layout of this component will cause an runtime exception to be thrown if rootPaneCheckingEnabled is true. Subclasses can disable this behavior.
Overrides:
setLayout in class Container
Parameters:
manager - the LayoutManager
Throws:
Error - if called with rootPaneChecking true
See Also:
setRootPaneCheckingEnabled(boolean)

getRootPane

public JRootPane getRootPane()
Returns the rootPane object for this dialog.
Specified by:
getRootPane in interface RootPaneContainer
See Also:
setRootPane(javax.swing.JRootPane), RootPaneContainer.getRootPane()

setRootPane

protected void setRootPane(JRootPane root)
Sets the rootPane property. This method is called by the constructor.
Parameters:
root - the rootPane object for this dialog
See Also:
getRootPane()

getContentPane

public Container getContentPane()
Returns the contentPane object for this dialog.
Specified by:
getContentPane in interface RootPaneContainer
Returns:
the contentPane property
See Also:
setContentPane(java.awt.Container), RootPaneContainer.getContentPane()

setContentPane

public void setContentPane(Container contentPane)
Sets the contentPane property. This method is called by the constructor.
Specified by:
setContentPane in interface RootPaneContainer
Parameters:
contentPane - the contentPane object for this dialog
Throws:
IllegalComponentStateException - (a runtime exception) if the content pane parameter is null
See Also:
getContentPane(), RootPaneContainer.setContentPane(java.awt.Container)

getLayeredPane

public JLayeredPane getLayeredPane()
Returns the layeredPane object for this dialog.
Specified by:
getLayeredPane in interface RootPaneContainer
Returns:
the layeredPane property
See Also:
setLayeredPane(javax.swing.JLayeredPane), RootPaneContainer.getLayeredPane()

setLayeredPane

public void setLayeredPane(JLayeredPane layeredPane)
Sets the layeredPane property. This method is called by the constructor.
Specified by:
setLayeredPane in interface RootPaneContainer
Parameters:
layeredPane - the new layeredPane property
Throws:
IllegalComponentStateException - (a runtime exception) if the layered pane parameter is null
See Also:
getLayeredPane(), RootPaneContainer.setLayeredPane(javax.swing.JLayeredPane)

getGlassPane

public Component getGlassPane()
Returns the glassPane object for this dialog.
Specified by:
getGlassPane in interface RootPaneContainer
Returns:
the glassPane property
See Also:
setGlassPane(java.awt.Component), RootPaneContainer.getGlassPane()

setGlassPane

public void setGlassPane(Component glassPane)
Sets the glassPane property. This method is called by the constructor.
Specified by:
setGlassPane in interface RootPaneContainer
Parameters:
glassPane - the glassPane object for this dialog
See Also:
getGlassPane(), RootPaneContainer.setGlassPane(java.awt.Component)

setLocationRelativeTo

public void setLocationRelativeTo(Component c)
Sets the location of the dialog relative to the specified component. If the component is not currently showing, the dialog is centered on the screen.
Parameters:
c - the component in relation to which the dialog's location is determined

paramString

protected String paramString()
Returns a string representation of this JDialog. 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 Dialog
Returns:
a string representation of this JDialog.

getAccessibleContext

public AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this JDialog. For JDialogs, the AccessibleContext takes the form of an AccessibleJDialog. A new AccessibleJDialog instance is created if necessary.
Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class Dialog
Returns:
an AccessibleJDialog that serves as the AccessibleContext of this JDialog

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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