Class JDialog

java.lang.Object
java.awt.Component
java.awt.Container
java.awt.Window
java.awt.Dialog
javax.swing.JDialog
All Implemented Interfaces:
ImageObserver, MenuContainer, Serializable, Accessible, RootPaneContainer, WindowConstants
@JavaBean(defaultProperty="JMenuBar", description="A toplevel window for creating dialog boxes.") 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. As a convenience, the add, remove, and setLayout methods of this class are overridden, so that they delegate calls to the corresponding methods of the ContentPane. For example, you can add a child component to a dialog as follows: 

       dialog.add(child);
And the child will be added to the contentPane. 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. Refer to RootPaneContainer for details on adding, removing and setting the LayoutManager of a JDialog.

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

In a multi-screen environment, you can create a JDialog on a different screen device than its owner. See Frame for more information.

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.

Since:
1.2
See Also:

  • Field Details

  • Constructor Details

    • JDialog

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

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Frame owner)
      Creates a modeless dialog with the specified Frame as its owner and an empty title. If owner is null, a shared, hidden frame will be set as the owner of the dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Parameters:
      owner - the Frame from which the dialog is displayed
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Frame owner, boolean modal)
      Creates a dialog with an empty title and the specified modality and Frame as its owner. If owner is null, a shared, hidden frame will be set as the owner of the dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Parameters:
      owner - the Frame from which the dialog is displayed
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE, otherwise the dialog is modeless.
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Frame owner, String title)
      Creates a modeless dialog with the specified title and with the specified owner frame. If owner is null, a shared, hidden frame will be set as the owner of the dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Parameters:
      owner - the Frame from which the dialog is displayed
      title - the String to display in the dialog's title bar
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Frame owner, String title, boolean modal)
      Creates a dialog with the specified title, owner Frame and modality. If owner is null, a shared, hidden frame will be set as the owner of this dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

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

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Parameters:
      owner - the Frame from which the dialog is displayed
      title - the String to display in the dialog's title bar
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE otherwise the dialog is modeless
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Frame owner, String title, boolean modal, GraphicsConfiguration gc)
      Creates a dialog with the specified title, owner Frame, modality and GraphicsConfiguration. If owner is null, a shared, hidden frame will be set as the owner of this dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

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

      NOTE: This constructor does not allow you to create an unowned JDialog. To create an unowned JDialog you must use either the JDialog(Window) or JDialog(Dialog) constructor with an argument of null.

      Parameters:
      owner - the Frame from which the dialog is displayed
      title - the String to display in the dialog's title bar
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE, otherwise the dialog is modeless.
      gc - the GraphicsConfiguration of the target screen device; if null, the default system GraphicsConfiguration is assumed
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      Since:
      1.4
      See Also:

    • JDialog

      public JDialog(Dialog owner)
      Creates a modeless dialog with the specified Dialog as its owner and an empty title.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the owner Dialog from which the dialog is displayed or null if this dialog has no owner
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Dialog owner, boolean modal)
      Creates a dialog with an empty title and the specified modality and Dialog as its owner.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the owner Dialog from which the dialog is displayed or null if this dialog has no owner
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE, otherwise the dialog is modeless.
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Dialog owner, String title)
      Creates a modeless dialog with the specified title and with the specified owner dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the owner Dialog from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Dialog owner, String title, boolean modal)
      Creates a dialog with the specified title, modality and the specified owner Dialog.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the owner Dialog from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE, otherwise the dialog is modeless
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      See Also:

    • JDialog

      public JDialog(Dialog owner, String title, boolean modal, GraphicsConfiguration gc)
      Creates a dialog with the specified title, owner Dialog, modality and GraphicsConfiguration.

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

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the owner Dialog from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar
      modal - specifies whether dialog blocks user input to other top-level windows when shown. If true, the modality type property is set to DEFAULT_MODALITY_TYPE, otherwise the dialog is modeless
      gc - the GraphicsConfiguration of the target screen device; if null, the default system GraphicsConfiguration is assumed
      Throws:
      HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
      Since:
      1.4
      See Also:

    • JDialog

      public JDialog(Window owner)
      Creates a modeless dialog with the specified Window as its owner and an empty title.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the Window from which the dialog is displayed or null if this dialog has no owner
      Throws:
      IllegalArgumentException - if the owner is not an instance of Dialog or Frame
      IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
      HeadlessException - when GraphicsEnvironment.isHeadless() returns true
      Since:
      1.6
      See Also:

    • JDialog

      public JDialog(Window owner, Dialog.ModalityType modalityType)
      Creates a dialog with an empty title and the specified modality and Window as its owner.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the Window from which the dialog is displayed or null if this dialog has no owner
      modalityType - specifies whether dialog blocks input to other windows when shown. null value and unsupported modality types are equivalent to MODELESS
      Throws:
      IllegalArgumentException - if the owner is not an instance of Dialog or Frame
      IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
      HeadlessException - when GraphicsEnvironment.isHeadless() returns true
      Since:
      1.6
      See Also:

    • JDialog

      public JDialog(Window owner, String title)
      Creates a modeless dialog with the specified title and owner Window.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the Window from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar or null if the dialog has no title
      Throws:
      IllegalArgumentException - if the owner is not an instance of Dialog or Frame
      IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
      HeadlessException - when GraphicsEnvironment.isHeadless() returns true
      Since:
      1.6
      See Also:

    • JDialog

      public JDialog(Window owner, String title, Dialog.ModalityType modalityType)
      Creates a dialog with the specified title, owner Window and modality.

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the Window from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar or null if the dialog has no title
      modalityType - specifies whether dialog blocks input to other windows when shown. null value and unsupported modality types are equivalent to MODELESS
      Throws:
      IllegalArgumentException - if the owner is not an instance of Dialog or Frame
      IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
      HeadlessException - when GraphicsEnvironment.isHeadless() returns true
      Since:
      1.6
      See Also:

    • JDialog

      public JDialog(Window owner, String title, Dialog.ModalityType modalityType, GraphicsConfiguration gc)
      Creates a dialog with the specified title, owner Window, modality and GraphicsConfiguration.

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

      This constructor sets the component's locale property to the value returned by JComponent.getDefaultLocale.

      Parameters:
      owner - the Window from which the dialog is displayed or null if this dialog has no owner
      title - the String to display in the dialog's title bar or null if the dialog has no title
      modalityType - specifies whether dialog blocks input to other windows when shown. null value and unsupported modality types are equivalent to MODELESS
      gc - the GraphicsConfiguration of the target screen device; if null, the default system GraphicsConfiguration is assumed
      Throws:
      IllegalArgumentException - if the owner is not an instance of Dialog or Frame
      IllegalArgumentException - if the owner's GraphicsConfiguration is not from a screen device
      HeadlessException - when GraphicsEnvironment.isHeadless() returns true
      Since:
      1.6
      See Also:

  • Method Details

    • 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.
      Returns:
      a new JRootPane

    • processWindowEvent

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

    • setDefaultCloseOperation

      @BeanProperty(preferred=true, enumerationValues={"WindowConstants.DO_NOTHING_ON_CLOSE","WindowConstants.HIDE_ON_CLOSE","WindowConstants.DISPOSE_ON_CLOSE"}, description="The dialog's default close operation.") public void setDefaultCloseOperation(int operation)
      Sets the operation that will happen by default when the user initiates a "close" on this dialog. You must specify one of the following choices:

      • DO_NOTHING_ON_CLOSE (defined in WindowConstants): Don't do anything; require the program to handle the operation in the windowClosing method of a registered WindowListener object.
      • HIDE_ON_CLOSE (defined in WindowConstants): Automatically hide the dialog after invoking any registered WindowListener objects.
      • DISPOSE_ON_CLOSE (defined in WindowConstants): Automatically hide and dispose the dialog after invoking any registered WindowListener objects.

      The value is set to HIDE_ON_CLOSE by default. Changes to the value of this property cause the firing of a property change event, with property name "defaultCloseOperation".

      Note: When the last displayable window within the Java virtual machine (VM) is disposed of, the VM may terminate. See AWT Threading Issues for more information.

      Parameters:
      operation - the operation which should be performed when the user closes the dialog
      Throws:
      IllegalArgumentException - if defaultCloseOperation value isn't one of the above valid values
      See Also:

    • 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:

    • setTransferHandler

      @BeanProperty(hidden=true, description="Mechanism for transfer of data into the component") public void setTransferHandler(TransferHandler newHandler)
      Sets the transferHandler property, which is a mechanism to support transfer of data into this component. Use null if the component does not support data transfer operations.

      If the system property suppressSwingDropSupport is false (the default) and the current drop target on this component is either null or not a user-set drop target, this method will change the drop target as follows: If newHandler is null it will clear the drop target. If not null it will install a new DropTarget.

      Note: When used with JDialog, TransferHandler only provides data import capability, as the data export related methods are currently typed to JComponent.

      Please see How to Use Drag and Drop and Data Transfer, a section in The Java Tutorial, for more information.

      Parameters:
      newHandler - the new TransferHandler
      Since:
      1.6
      See Also:

    • getTransferHandler

      public TransferHandler getTransferHandler()
      Gets the transferHandler property.
      Returns:
      the value of the transferHandler property
      Since:
      1.6
      See Also:

    • update

      public void update(Graphics g)
      Calls paint(g). This method was overridden to prevent an unnecessary call to clear the background.
      Overrides:
      update in class Container
      Parameters:
      g - the Graphics context in which to paint
      See Also:

    • setJMenuBar

      @BeanProperty(bound=false, hidden=true, description="The menubar for accessing pulldown menus from this dialog.") public void setJMenuBar(JMenuBar menu)
      Sets the menubar for this dialog.
      Parameters:
      menu - the menubar being placed in the dialog
      See Also:

    • getJMenuBar

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

    • isRootPaneCheckingEnabled

      protected boolean isRootPaneCheckingEnabled()
      Returns whether calls to add and setLayout are forwarded to the contentPane.
      Returns:
      true if add and setLayout are forwarded; false otherwise
      See Also:

    • setRootPaneCheckingEnabled

      @BeanProperty(hidden=true, description="Whether the add and setLayout methods are forwarded") protected void setRootPaneCheckingEnabled(boolean enabled)
      Sets whether calls to add and setLayout are forwarded to the contentPane.
      Parameters:
      enabled - true if add and setLayout are forwarded, false if they should operate directly on the JDialog.
      See Also:

    • addImpl

      protected void addImpl(Component comp, Object constraints, int index)
      Adds the specified child Component. This method is overridden to conditionally forward calls to the contentPane. By default, children are added to the contentPane instead of the frame, refer to RootPaneContainer for details.
      Overrides:
      addImpl in class Container
      Parameters:
      comp - the component to be enhanced
      constraints - the constraints to be respected
      index - the index
      Throws:
      IllegalArgumentException - if index is invalid
      IllegalArgumentException - if adding the container's parent to itself
      IllegalArgumentException - if adding a window to a container
      See Also:

    • remove

      public void remove(Component comp)
      Removes the specified component from the container. If comp is not the rootPane, this will forward the call to the contentPane. This will do nothing if comp is not a child of the JDialog or contentPane.
      Overrides:
      remove in class Container
      Parameters:
      comp - the component to be removed
      Throws:
      NullPointerException - if comp is null
      See Also:

    • setLayout

      public void setLayout(LayoutManager manager)
      Sets the LayoutManager. Overridden to conditionally forward the call to the contentPane. Refer to RootPaneContainer for more information.
      Overrides:
      setLayout in class Container
      Parameters:
      manager - the LayoutManager
      See Also:

    • getRootPane

      @BeanProperty(bound=false, hidden=true, description="the RootPane object for this dialog.") public JRootPane getRootPane()
      Returns the rootPane object for this dialog.
      Specified by:
      getRootPane in interface RootPaneContainer
      Returns:
      this components single JRootPane child.
      See Also:

    • 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:

    • getContentPane

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

    • setContentPane

      @BeanProperty(bound=false, hidden=true, description="The client area of the dialog where child components are normally inserted.") public void setContentPane(Container contentPane)
      Sets the contentPane property. This method is called by the constructor.

      Swing's painting architecture requires an opaque JComponent in the containment hierarchy. This is typically provided by the content pane. If you replace the content pane it is recommended you replace it with an opaque JComponent.

      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:

    • getLayeredPane

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

    • setLayeredPane

      @BeanProperty(bound=false, hidden=true, description="The pane which holds the various dialog layers.") 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:

    • getGlassPane

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

    • setGlassPane

      @BeanProperty(bound=false, hidden=true, description="A transparent pane used for menu rendering.") 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:

    • getGraphics

      @BeanProperty(bound=false) public Graphics getGraphics()
      Creates a graphics context for this component. This method will return null if this component is currently not displayable.
      Overrides:
      getGraphics in class Component
      Returns:
      a graphics context for this component, or null if it has none
      Since:
      1.6
      See Also:

    • repaint

      public void repaint(long time, int x, int y, int width, int height)
      Repaints the specified rectangle of this component within time milliseconds. Refer to RepaintManager for details on how the repaint is handled.
      Overrides:
      repaint in class Component
      Parameters:
      time - maximum time in milliseconds before update
      x - the x coordinate
      y - the y coordinate
      width - the width
      height - the height
      Since:
      1.6
      See Also:

    • setDefaultLookAndFeelDecorated

      public static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated)
      Provides a hint as to whether or not newly created JDialogs should have their Window decorations (such as borders, widgets to close the window, title...) provided by the current look and feel. If defaultLookAndFeelDecorated is true, the current LookAndFeel supports providing window decorations, and the current window manager supports undecorated windows, then newly created JDialogs will have their Window decorations provided by the current LookAndFeel. Otherwise, newly created JDialogs will have their Window decorations provided by the current window manager.

      You can get the same effect on a single JDialog by doing the following: 

          JDialog dialog = new JDialog();
    dialog.setUndecorated(true);
    dialog.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
      Parameters:
      defaultLookAndFeelDecorated - A hint as to whether or not current look and feel should provide window decorations
      Since:
      1.4
      See Also:

    • isDefaultLookAndFeelDecorated

      public static boolean isDefaultLookAndFeelDecorated()
      Returns true if newly created JDialogs should have their Window decorations provided by the current look and feel. This is only a hint, as certain look and feels may not support this feature.
      Returns:
      true if look and feel should provide Window decorations.
      Since:
      1.4

    • 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