Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JOptionPane - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing
Class JOptionPane

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JOptionPane

public class JOptionPane
extends JComponent
implements Accessible

JOptionPane makes it easy to pop up a standard dialog box that prompts users for a value or informs them of something. While the class may appear complex because of the large number of methods, almost all uses of this class are one-line calls to one of the static showXxxDialog methods shown below:

showConfirmDialog Asks a confirming question, like yes/no/cancel.
showInputDialog Prompt for some input.
showMessageDialog Tell the user about something that has happened.
showOptionDialog The Grand Unification of the above three.

Each of these methods also comes in a showInternalXXX flavor, which uses an internal frame to hold the dialog box (see JInternalFrame). Multiple convenience methods have also been defined -- overloaded versions of the basic methods that use different parameter lists.

All dialogs are modal. Each showXxxDialog method blocks the current thread until the user's interaction is complete.

icon message
input value
option buttons
The basic appearance of one of these dialog boxes is generally similar to the picture at the right, although the various look-and-feels are ultimatly responsible for the final result.

Parameters:
The parameters to these methods follow consistent patterns:

parentComponent
Defines the Component that is to be the parent of this dialog box. It is used in two ways: the Frame that contains it is used as the Frame parent for the dialog box, and its screen coordinates are used in the placement of the dialog box. In general, the dialog box is placed just below the component. This parameter may be null, in which case a default Frame is used as the parent, and the dialog will be centered on the screen (depending on the L&F).
message
A descriptive message to be placed in the dialog box. In the most common usage, message is just a String or String constant. However, the type of this parameter is actually Object. It's interpretation depends on its type:

Object[]
An array of objects is interpreted as a series of messages (one per object) arranged in a vertical stack. The interpretation is recursive -- each object in the array is interpreted according to its type.
Component
The Component is displayed in the dialog.
Icon
The Icon is wrapped in a JLabel and displayed in the dialog.
others
The object is converted to a String by calling its toString method. The result is wrapped in a JLabel and displayed.

messageType
Defines the style of the message. The look&feel manager may lay out the dialog differently depending on this value, and will often provide a default icon. The possible values are:

ERROR_MESSAGE
INFORMATION_MESSAGE
WARNING_MESSAGE
QUESTION_MESSAGE
PLAIN_MESSAGE

optionType
Defines the set of option buttons that appear at the bottom of the dialog box:

DEFAULT_OPTION
YES_NO_OPTION
YES_NO_CANCEL_OPTION
OK_CANCEL_OPTION
You aren't limited to this set of option buttons. You can provide any buttons you want using the options parameter.
options
A more detailed description of the set of option buttons that will appear at the bottom of the dialog box. The usual value for the options parameter is an array of Strings. But the parameter type is an array of Objects. A button is created for each object depending on it's type:

Component
The component is added to the button row directly.
Icon
A JButton is created with this as its label.
other
The Object is converted to a string using its toString method and the result is used to label a JButton.

icon
A decorative icon to be placed in the dialog box. A default value for this is determined by the messageType parameter.
title
The title for the dialog box.
initialValue
The default selection (input value).

When the selection is changed, setValue is invoked, which generates a PropertyChangeEvent.

If a JOptionPane has configured to all input setWantsInput the bound property JOptionPane.INPUT_VALUE_PROPERTY can also be listened to, to determine when the user has input or selected a value.

When one of the showXxxDialog methods returns an integer, the possible values are:

     YES_OPTION,
     NO_OPTION,
     CANCEL_OPTION,
     OK_OPTION, or
     CLOSED_OPTION.

Examples:

Show an error dialog that displays the message, 'alert':


 JOptionPane.showMessageDialog(null, "alert", "alert", ERROR_MESSAGE);

Show an internal information dialog with the message, 'information':


 JOptionPane.showInternalMessageDialog(frame, INFORMATION_MESSAGE,

             "information", "information");

Show an information panel with the options yes/no and message 'choose one':

JOptionPane.showConfirmDialog(null,
             "choose one", "choose one", YES_NO_OPTION);

Show an internal information dialog with the options yes/no/cancel and message 'please choose one' and title information:

JOptionPane.showInternalConfirmDialog(frame,
             "please choose one", "information",
             YES_NO_CANCEL_OPTION, INFORMATION_MESSAGE);

Show a warning dialog with the options OK, CANCEL, title 'Warning', and message 'Click OK to continue':


 Object[] options = { "OK", "CANCEL" };

 JOptionPane.showOptionDialog(null, "Click OK to continue", "Warning",
             DEFAULT_OPTION, WARNING_MESSAGE,
             null, options, options[0]);

Show a dialog asking the user to type in a String:


 String inputValue = JOptionPane.showInputDialog("Please input a value");

Show a dialog asking the user to select a String:


 Object[] possibleValues = { "First", "Second", "Third" };

 Object selectedValue = JOptionPane.showInputDialog(null,
             "Choose one", "Input",
             JOptionPane.INFORMATION_MESSAGE, null,
             possibleValues, possibleValues[0]);

Direct Use:
To create and use an JOptionPane directly, the standard pattern is roughly as follows:

     JOptionPane pane = new JOptionPane(arguments);
     pane.set.Xxxx(...); // Configure
     JDialog dialog = pane.createDialog(parentComponent, title);
     dialog.show();
     Object selectedValue = pane.getValue();
     if(selectedValue == null)
       return CLOSED_OPTION;
     //If there is not an array of option buttons:
     if(options == null) {
       if(selectedValue instanceof Integer)
          return ((Integer)selectedValue).intValue();
       return CLOSED_OPTION;
     }
     //If there is an array of option buttons:
     for(int counter = 0, maxCounter = options.length;
        counter < maxCounter; counter++) {
        if(options[counter].equals(selectedValue))
        return counter;
     }
     return CLOSED_OPTION;

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JOptionPane 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:: JInternalFrame, Serialized Form

Inner Class Summary

protected class JOptionPane.AccessibleJOptionPane
          Accessiblity support.

Inner classes inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Field Summary

static int CANCEL_OPTION
          Return value from class method if CANCEL is chosen.

static int CLOSED_OPTION
          Return value from class method if user closes window without selecting anything, more than likely this should be treated as either a CANCEL_OPTION or NO_OPTION.

static int DEFAULT_OPTION
          Type meaning look and feel should not supply any options -- only use the options from the JOptionPane.

static int ERROR_MESSAGE
          Used for error messages.

protected Icon icon
          Icon used in pane.

static String ICON_PROPERTY
          Bound property name for icon.

static int INFORMATION_MESSAGE
          Used for information messages.

static String INITIAL_SELECTION_VALUE_PROPERTY
          Bound property name for initialSelectionValue.

static String INITIAL_VALUE_PROPERTY
          Bounds property name for initialValue.

protected Object initialSelectionValue
          Initial value to select in selectionValues.

protected Object initialValue
          Value that should be initialy selected in options.

static String INPUT_VALUE_PROPERTY
          Bound property name for inputValue.

protected Object inputValue
          Value the user has input.

protected Object message
          Message to display.

static String MESSAGE_PROPERTY
          Bound property name for message.

static String MESSAGE_TYPE_PROPERTY
          Bounds property name for type.

protected int messageType
          Message type.

static int NO_OPTION
          Return value from class method if NO is chosen.

static int OK_CANCEL_OPTION
          Type used for showConfirmDialog.

static int OK_OPTION
          Return value form class method if OK is chosen.

static String OPTION_TYPE_PROPERTY
          Bound property name for optionType.

protected Object[] options
          Options to display to the user.

static String OPTIONS_PROPERTY
          Bounds property namer for option.

protected int optionType
          Option type, one of DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION or OK_CANCEL_OPTION.

static int PLAIN_MESSAGE
          No icon is used.

static int QUESTION_MESSAGE
          Used for questions.

static String SELECTION_VALUES_PROPERTY
          Bound property name for selectionValues.

protected Object[] selectionValues
          Array of values the user can choose from.

static Object UNINITIALIZED_VALUE
          Indicates that the user has not yet selected a value.

protected Object value
          Currently selected value, will be a valid option, or UNINITIALIZED_VALUE or null.

static String VALUE_PROPERTY
          Bounds property name for value.

static String WANTS_INPUT_PROPERTY
          Bound property name for wantsInput.

protected boolean wantsInput
          If true, a UI widget will be provided to the user to get input.

static int WARNING_MESSAGE
          Used for warning messages.

static int YES_NO_CANCEL_OPTION
          Type used for showConfirmDialog.

static int YES_NO_OPTION
          Type used for showConfirmDialog.

static int YES_OPTION
          Return value from class method if YES is chosen.

Fields inherited from class javax.swing.JComponent

accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

JOptionPane()
          Creates a JOptionPane with a test message.

JOptionPane(Object message)
          Creates a instance of JOptionPane to display a message using the plain-message message type and the default options delivered by the UI.

JOptionPane(Object message, int messageType)
          Creates an instance of JOptionPane to display a message with the specified message type and the default options,

JOptionPane(Object message, int messageType, int optionType)
          Creates an instance of JOptionPane to display a message with the specified message type and options.

JOptionPane(Object message, int messageType, int optionType, Icon icon)
          Creates an instance of JOptionPane to display a message with the specified message type, options, and icon.

JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options)
          Creates an instance of JOptionPane to display a message with the specified message type, icon, and options.

JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options, Object initialValue)
          Creates an instance of JOptionPane to display a message with the specified message type, icon, and options, with the inititially-selected option specified.

Method Summary

JDialog createDialog(Component parentComponent, String title)
          Creates and returns a new JDialog wrapping this centered on the parentComponent in the parentComponent's frame.

JInternalFrame createInternalFrame(Component parentComponent, String title)
          Creates and returns an instance of JInternalFrame.

AccessibleContext getAccessibleContext()
          Get the AccessibleContext associated with this JComponent

static JDesktopPane getDesktopPaneForComponent(Component parentComponent)
          Returns the specified component's desktop pane.

static Frame getFrameForComponent(Component parentComponent)
          Returns the specified component's Frame.

Icon getIcon()
          Returns the icon this pane displays.

Object getInitialSelectionValue()
          Returns the initial-selection value..

Object getInitialValue()
          Returns the initial value.

Object getInputValue()
          Returns the value the user has input, if wantsInput is true.

int getMaxCharactersPerLineCount()
          Returns the maximum number of characters to place on a line in a message.

Object getMessage()
          Returns the message-object this pane displays.

int getMessageType()
          Returns the message type.

Object[] getOptions()
          Returns the choices the user can make.

int getOptionType()
          Returns the type of options that are displayed.

static Frame getRootFrame()
          Returns the Frame to use for the class methods in which a frame is not provided.

Object[] getSelectionValues()
          Returns the selection values.

OptionPaneUI getUI()
          Returns the UI object which implements the L&F for this component.

String getUIClassID()
          Returns the name of the UI class that implements the L&F for this component.

Object getValue()
          Returns the value the user has selected.

boolean getWantsInput()
          Returns true if a parentComponent will be provided for the user to input.

protected String paramString()
          Returns a string representation of this JOptionPane.

void selectInitialValue()
          Requests that the initial value be selected, which will set focus to the initial value.

void setIcon(Icon newIcon)
          Sets the icon to display.

void setInitialSelectionValue(Object newValue)
          Sets the initial selection value.

void setInitialValue(Object newInitialValue)
          Sets the initial value that is to be enabled -- the Component that has the focus when the pane is initially displayed.

void setInputValue(Object newValue)
          Sets the user's input-value.

void setMessage(Object newMessage)
          Sets the option pane's message-object.

void setMessageType(int newType)
          Sets the option pane's message type.

void setOptions(Object[] newOptions)
          Sets the options this pane displays.

void setOptionType(int newType)
          Sets the options to display.

static void setRootFrame(Frame newRootFrame)
          Sets the frame to use for class methods in which a frame is not provided.

void setSelectionValues(Object[] newValues)
          Sets the selection values for a pane that provides the user with a list of items to choose from.

void setUI(OptionPaneUI ui)
          Sets the UI object which implements the L&F for this component.

void setValue(Object newValue)
          Sets the value the user has chosen.

void setWantsInput(boolean newValue)
          If newValue is true, a parentComponent is provided to allow the user to input a value.

static int showConfirmDialog(Component parentComponent, Object message)
          Brings up a modal dialog with the options Yes, No and Cancel; with the title, "Select an Option".

static int showConfirmDialog(Component parentComponent, Object message, String title, int optionType)
          Brings up a modal dialog where the number of choices is determined by the optionType parameter.

static int showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType)
          Brings up a modal dialog where the number of choices is determined by the optionType parameter, where the messageType parameter determines the icon to display.

static int showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon)
          Brings up a modal dialog with a specified icon, where the number of choices is determined by the optionType parameter.

static String showInputDialog(Component parentComponent, Object message)
          Shows a question-message dialog requesting input from the user parented to parentComponent.

static String showInputDialog(Component parentComponent, Object message, String title, int messageType)
          Shows a dialog requesting input from the user parented to parentComponent with the dialog having the title title and message type messageType.

static Object showInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue)
          Prompts the user for input in a blocking dialog where the initial selection, possible selections, and all other options can be specified.

static String showInputDialog(Object message)
          Shows a question-message dialog requesting input from the user.

static int showInternalConfirmDialog(Component parentComponent, Object message)
          Brings up an internal dialog panel with the options Yes, No and Cancel; with the title, "Select an Option".

static int showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType)
          Brings up a internal dialog panel where the number of choices is determined by the optionType parameter.

static int showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType)
          Brings up an internal dialog panel where the number of choices is determined by the optionType parameter, where the messageType parameter determines the icon to display.

static int showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon)
          Brings up an internal dialog panel with a specified icon, where the number of choices is determined by the optionType parameter.

static String showInternalInputDialog(Component parentComponent, Object message)
          Shows an internal question-message dialog requesting input from the user parented to parentComponent.

static String showInternalInputDialog(Component parentComponent, Object message, String title, int messageType)
          Shows an internal dialog requesting input from the user parented to parentComponent with the dialog having the title title and message type messageType.

static Object showInternalInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue)
          Prompts the user for input in a blocking internal dialog where the initial selection, possible selections, and all other options can be specified.

static void showInternalMessageDialog(Component parentComponent, Object message)
          Brings up an internal confirmation dialog panel.

static void showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType)
          Brings up an internal dialog panel that displays a message using a default icon determined by the messageType parameter.

static void showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon)
          Brings up an internal dialog panel displaying a message, specifying all parameters.

static int showInternalOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue)
          Brings up an internal dialog panel with a specified icon, where the initial choice is dermined by the initialValue parameter and the number of choices is determined by the optionType parameter.

static void showMessageDialog(Component parentComponent, Object message)
          Brings up a confirmation dialog -- a modal information-message dialog titled "Confirm".

static void showMessageDialog(Component parentComponent, Object message, String title, int messageType)
          Brings up a dialog that displays a message using a default icon determined by the messageType parameter.

static void showMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon)
          Brings up a dialog displaying a message, specifying all parameters.

static int showOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue)
          Brings up a modal dialog with a specified icon, where the initial choice is dermined by the initialValue parameter and the number of choices is determined by the optionType parameter.

void updateUI()
          Notification from the UIManager that the L&F has changed.

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getAlignmentX, getAlignmentY, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getGraphics, getHeight, getInsets, getInsets, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getVisibleRect, getWidth, getX, getY, grabFocus, hasFocus, isDoubleBuffered, isFocusCycleRoot, isFocusTraversable, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, processComponentKeyEvent, processFocusEvent, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDoubleBuffered, setEnabled, setFont, setForeground, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setUI, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getLayout, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setCursor, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hide, imageUpdate, inside, isDisplayable, isEnabled, isLightweight, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processInputMethodEvent, processMouseEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setDropTarget, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

UNINITIALIZED_VALUE

public static final Object UNINITIALIZED_VALUE

Indicates that the user has not yet selected a value.

DEFAULT_OPTION

public static final int DEFAULT_OPTION

Type meaning look and feel should not supply any options -- only use the options from the JOptionPane.

YES_NO_OPTION

public static final int YES_NO_OPTION

Type used for showConfirmDialog.

YES_NO_CANCEL_OPTION

public static final int YES_NO_CANCEL_OPTION

Type used for showConfirmDialog.

OK_CANCEL_OPTION

public static final int OK_CANCEL_OPTION

Type used for showConfirmDialog.

YES_OPTION

public static final int YES_OPTION

Return value from class method if YES is chosen.

NO_OPTION

public static final int NO_OPTION

Return value from class method if NO is chosen.

CANCEL_OPTION

public static final int CANCEL_OPTION

Return value from class method if CANCEL is chosen.

OK_OPTION

public static final int OK_OPTION

Return value form class method if OK is chosen.

CLOSED_OPTION

public static final int CLOSED_OPTION

Return value from class method if user closes window without selecting anything, more than likely this should be treated as either a CANCEL_OPTION or NO_OPTION.

ERROR_MESSAGE

public static final int ERROR_MESSAGE

Used for error messages.

INFORMATION_MESSAGE

public static final int INFORMATION_MESSAGE

Used for information messages.

WARNING_MESSAGE

public static final int WARNING_MESSAGE

Used for warning messages.

QUESTION_MESSAGE

public static final int QUESTION_MESSAGE

Used for questions.

PLAIN_MESSAGE

public static final int PLAIN_MESSAGE

No icon is used.

ICON_PROPERTY

public static final String ICON_PROPERTY

Bound property name for icon.

MESSAGE_PROPERTY

public static final String MESSAGE_PROPERTY

Bound property name for message.

VALUE_PROPERTY

public static final String VALUE_PROPERTY

Bounds property name for value.

OPTIONS_PROPERTY

public static final String OPTIONS_PROPERTY

Bounds property namer for option.

INITIAL_VALUE_PROPERTY

public static final String INITIAL_VALUE_PROPERTY

Bounds property name for initialValue.

MESSAGE_TYPE_PROPERTY

public static final String MESSAGE_TYPE_PROPERTY

Bounds property name for type.

OPTION_TYPE_PROPERTY

public static final String OPTION_TYPE_PROPERTY

Bound property name for optionType.

SELECTION_VALUES_PROPERTY

public static final String SELECTION_VALUES_PROPERTY

Bound property name for selectionValues.

INITIAL_SELECTION_VALUE_PROPERTY

public static final String INITIAL_SELECTION_VALUE_PROPERTY

Bound property name for initialSelectionValue.

INPUT_VALUE_PROPERTY

public static final String INPUT_VALUE_PROPERTY

Bound property name for inputValue.

WANTS_INPUT_PROPERTY

public static final String WANTS_INPUT_PROPERTY

Bound property name for wantsInput.

icon

protected transient Icon icon

Icon used in pane.

message

protected transient Object message

Message to display.

options

protected transient Object[] options

Options to display to the user.

initialValue

protected transient Object initialValue

Value that should be initialy selected in options.

messageType

protected int messageType

Message type.

optionType

protected int optionType

Option type, one of DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION or OK_CANCEL_OPTION.

value

protected transient Object value

Currently selected value, will be a valid option, or UNINITIALIZED_VALUE or null.

selectionValues

protected transient Object[] selectionValues

Array of values the user can choose from. Look and feel will provide the UI component to choose this from.

inputValue

protected transient Object inputValue

Value the user has input.

initialSelectionValue

protected transient Object initialSelectionValue

Initial value to select in selectionValues.

wantsInput

protected boolean wantsInput

If true, a UI widget will be provided to the user to get input.

Constructor Detail

JOptionPane

public JOptionPane()

Creates a JOptionPane with a test message.

JOptionPane

public JOptionPane(Object message)

Creates a instance of JOptionPane to display a message using the plain-message message type and the default options delivered by the UI.

Parameters:: message - the Object to display

JOptionPane

public JOptionPane(Object message,
                   int messageType)

Creates an instance of JOptionPane to display a message with the specified message type and the default options,

Parameters:: message - the Object to display; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

JOptionPane

public JOptionPane(Object message,
                   int messageType,
                   int optionType)

Creates an instance of JOptionPane to display a message with the specified message type and options.

Parameters:: message - the Object to display; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; optionType - the options to display in the pane: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION OK_CANCEL_OPTION

JOptionPane

public JOptionPane(Object message,
                   int messageType,
                   int optionType,
                   Icon icon)

Creates an instance of JOptionPane to display a message with the specified message type, options, and icon.

Parameters:: message - the Object to display; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; optionType - the options to display in the pane: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION OK_CANCEL_OPTION; icon - the Icon image to display

JOptionPane

public JOptionPane(Object message,
                   int messageType,
                   int optionType,
                   Icon icon,
                   Object[] options)

Creates an instance of JOptionPane to display a message with the specified message type, icon, and options. None of the options is initially selected.

The options objects should contain either instances of Components, (which are added directly) or Strings (which are wrapped in a JButton). If you provide Components, you must ensure that when the Component is clicked it messages setValue in the created JOptionPane.

Parameters:: message - the Object to display; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; optionType - the options to display in the pane: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION OK_CANCEL_OPTION. Only meaningful if the options parameter is null.; icon - the Icon image to display; options - the choices the user can select

JOptionPane

public JOptionPane(Object message,
                   int messageType,
                   int optionType,
                   Icon icon,
                   Object[] options,
                   Object initialValue)

Creates an instance of JOptionPane to display a message with the specified message type, icon, and options, with the inititially-selected option specified.

Parameters:: message - the Object to display; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; optionType - the options to display in the pane: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION OK_CANCEL_OPTION. Only meaningful if the options parameter is null.; icon - the Icon image to display; options - the choices the user can select; initialValue - the choice that is initially selected

Method Detail

showInputDialog

public static String showInputDialog(Object message)

Shows a question-message dialog requesting input from the user. The dialog uses the default frame, which usually means it is centered on the screen.

Parameters:: message - the Object to display

showInputDialog

public static String showInputDialog(Component parentComponent,
                                     Object message)

Shows a question-message dialog requesting input from the user parented to parentComponent. The dialog is displayed in the Component's frame, and is usually positioned below the Component.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display

showInputDialog

public static String showInputDialog(Component parentComponent,
                                     Object message,
                                     String title,
                                     int messageType)

Shows a dialog requesting input from the user parented to parentComponent with the dialog having the title title and message type messageType.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display; title - the String to display in the dialog title bar; messageType - the type of message that is to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

showInputDialog

public static Object showInputDialog(Component parentComponent,
                                     Object message,
                                     String title,
                                     int messageType,
                                     Icon icon,
                                     Object[] selectionValues,
                                     Object initialSelectionValue)

Prompts the user for input in a blocking dialog where the initial selection, possible selections, and all other options can be specified. The user will able to choose from selectionValues, where null implies the user can input whatever they wish, usually by means of a JTextField. initialSelectionValue is the initial value to prompt the user with. It is up to the UI to decide how best to represent the selectionValues, but usually a JComboBox, JList, or JTextField will be used.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display; title - the String to display in the dialog title bar; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the Icon image to display; selectionValues - an array of Objects that gives the possible selections; initialSelectionValue - the value used to initialize the input field
Returns:: users input, or null meaning the user canceled the input

showMessageDialog

public static void showMessageDialog(Component parentComponent,
                                     Object message)

Brings up a confirmation dialog -- a modal information-message dialog titled "Confirm".

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display

showMessageDialog

public static void showMessageDialog(Component parentComponent,
                                     Object message,
                                     String title,
                                     int messageType)

Brings up a dialog that displays a message using a default icon determined by the messageType parameter.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

showMessageDialog

public static void showMessageDialog(Component parentComponent,
                                     Object message,
                                     String title,
                                     int messageType,
                                     Icon icon)

Brings up a dialog displaying a message, specifying all parameters.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - an icon to display in the dialog that helps the user identify the kind of message that is being displayed.

showConfirmDialog

public static int showConfirmDialog(Component parentComponent,
                                    Object message)

Brings up a modal dialog with the options Yes, No and Cancel; with the title, "Select an Option".

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display
Returns:: an int indicating the option selected by the user

showConfirmDialog

public static int showConfirmDialog(Component parentComponent,
                                    Object message,
                                    String title,
                                    int optionType)

Brings up a modal dialog where the number of choices is determined by the optionType parameter.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION
Returns:: an int indicating the option selected by the user

showConfirmDialog

public static int showConfirmDialog(Component parentComponent,
                                    Object message,
                                    String title,
                                    int optionType,
                                    int messageType)

Brings up a modal dialog where the number of choices is determined by the optionType parameter, where the messageType parameter determines the icon to display. The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.
Returns:: an int indicating the option selected by the user

showConfirmDialog

public static int showConfirmDialog(Component parentComponent,
                                    Object message,
                                    String title,
                                    int optionType,
                                    int messageType,
                                    Icon icon)

Brings up a modal dialog with a specified icon, where the number of choices is determined by the optionType parameter. The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the icon to display in the dialog
Returns:: an int indicating the option selected by the user

showOptionDialog

public static int showOptionDialog(Component parentComponent,
                                   Object message,
                                   String title,
                                   int optionType,
                                   int messageType,
                                   Icon icon,
                                   Object[] options,
                                   Object initialValue)

Brings up a modal dialog with a specified icon, where the initial choice is dermined by the initialValue parameter and the number of choices is determined by the optionType parameter.

If optionType is YES_NO_OPTION, or YES_NO_CANCEL_OPTION and the options parameter is null, then the options are supplied by the look and feel.

The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the icon to display in the dialog; options - an array of objects indicating the possible choices the user can make. If the objects are components, they are rendered properly. Non-String objects are rendered using their toString methods. If this parameter is null, the options are determined by the look and feel.; initialValue - the object that represents the default selection for the dialog
Returns:: an int indicating the option chosen by the user, or CLOSED_OPTION if the user closed the Dialog

createDialog

public JDialog createDialog(Component parentComponent,
                            String title)

Creates and returns a new JDialog wrapping this centered on the parentComponent in the parentComponent's frame. title is the title of the returned dialog. The returned JDialog will be set up such that once it is closed, or the user clicks on the OK button, the dialog will be disposed and closed. Re if the parentComponent has no Frame, a default Frame is used.

Parameters:: title - the title string for the dialog
Returns:: a new JDialog containing this instance

showInternalMessageDialog

public static void showInternalMessageDialog(Component parentComponent,
                                             Object message)

Brings up an internal confirmation dialog panel. The dialog is a modal information-message dialog titled "Message".

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The object to display

showInternalMessageDialog

public static void showInternalMessageDialog(Component parentComponent,
                                             Object message,
                                             String title,
                                             int messageType)

Brings up an internal dialog panel that displays a message using a default icon determined by the messageType parameter.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

showInternalMessageDialog

public static void showInternalMessageDialog(Component parentComponent,
                                             Object message,
                                             String title,
                                             int messageType,
                                             Icon icon)

Brings up an internal dialog panel displaying a message, specifying all parameters.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display; title - the title string for the dialog; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - an icon to display in the dialog that helps the user identify the kind of message that is being displayed.

showInternalConfirmDialog

public static int showInternalConfirmDialog(Component parentComponent,
                                            Object message)

Brings up an internal dialog panel with the options Yes, No and Cancel; with the title, "Select an Option".

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The Object to display
Returns:: an int indicating the option selected by the user

showInternalConfirmDialog

public static int showInternalConfirmDialog(Component parentComponent,
                                            Object message,
                                            String title,
                                            int optionType)

Brings up a internal dialog panel where the number of choices is determined by the optionType parameter.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The object to display in the dialog. A Component object is rendered as a Component. A String object is rendered as a string. Other objects are converted to a String using the toString method.; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION
Returns:: an int indicating the option selected by the user

showInternalConfirmDialog

public static int showInternalConfirmDialog(Component parentComponent,
                                            Object message,
                                            String title,
                                            int optionType,
                                            int messageType)

Brings up an internal dialog panel where the number of choices is determined by the optionType parameter, where the messageType parameter determines the icon to display. The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The object to display in the dialog. A Component object is rendered as a Component. A String object is rendered as a string. Other objects are converted to a String using the toString method.; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.
Returns:: an int indicating the option selected by the user

showInternalConfirmDialog

public static int showInternalConfirmDialog(Component parentComponent,
                                            Object message,
                                            String title,
                                            int optionType,
                                            int messageType,
                                            Icon icon)

Brings up an internal dialog panel with a specified icon, where the number of choices is determined by the optionType parameter. The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The object to display in the dialog. A Component object is rendered as a Component. A String object is rendered as a string. Other objects are converted to a String using the toString method.; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the icon to display in the dialog
Returns:: an int indicating the option selected by the user

showInternalOptionDialog

public static int showInternalOptionDialog(Component parentComponent,
                                           Object message,
                                           String title,
                                           int optionType,
                                           int messageType,
                                           Icon icon,
                                           Object[] options,
                                           Object initialValue)

Brings up an internal dialog panel with a specified icon, where the initial choice is dermined by the initialValue parameter and the number of choices is determined by the optionType parameter.

If optionType is YES_NO_OPTION, or YES_NO_CANCEL_OPTION and the options parameter is null, then the options are supplied by the look and feel.

The messageType parameter is primarily used to supply a default icon from the look and feel.

Parameters:: parentComponent - Determines the Frame in which the dialog is displayed. If null, or if the parentComponent has no Frame, a default Frame is used.; message - The object to display in the dialog. A Component object is rendered as a Component. A String object is rendered as a string. Other objects are converted to a String using the toString method.; title - the title string for the dialog; optionType - an int designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION; messageType - an int designating the kind of message this is, primarily used to determine the icon from the pluggable look and feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the icon to display in the dialog; options - an array of objects indicating the possible choices the user can make. If the objects are components, they are rendered properly. Non-String objects are rendered using their toString methods. If this parameter is null, the options are determined by the look and feel.; initialValue - the object that represents the default selection for the dialog
Returns:: an int indicating the option chosen by the user, or CLOSED_OPTION if the user closed the Dialog

showInternalInputDialog

public static String showInternalInputDialog(Component parentComponent,
                                             Object message)

Shows an internal question-message dialog requesting input from the user parented to parentComponent. The dialog is displayed in the Component's frame, and is usually positioned below the Component.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display

showInternalInputDialog

public static String showInternalInputDialog(Component parentComponent,
                                             Object message,
                                             String title,
                                             int messageType)

Shows an internal dialog requesting input from the user parented to parentComponent with the dialog having the title title and message type messageType.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display; title - the String to display in the dialog title bar; messageType - the type of message that is to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

showInternalInputDialog

public static Object showInternalInputDialog(Component parentComponent,
                                             Object message,
                                             String title,
                                             int messageType,
                                             Icon icon,
                                             Object[] selectionValues,
                                             Object initialSelectionValue)

Prompts the user for input in a blocking internal dialog where the initial selection, possible selections, and all other options can be specified. The user will able to choose from selectionValues, where null implies the user can input whatever they wish, usually by means of a JTextField. initialSelectionValue is the initial value to prompt the user with. It is up to the UI to decide how best to represent the selectionValues, but usually a JComboBox, JList, or JTextField will be used.

Parameters:: parentComponent - the parent Component for the dialog; message - the Object to display; title - the String to display in the dialog title bar; messageType - the type of message to be displayed: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.; icon - the Icon image to display; selectionValues - an array of Objects that gives the possible selections; initialSelectionValue - the value used to initialize the input field
Returns:: users input, or null meaning the user canceled the input

createInternalFrame

public JInternalFrame createInternalFrame(Component parentComponent,
                                          String title)

Creates and returns an instance of JInternalFrame. The internal frame is created with the specified title, and wrapping the JOptionPane. The returned JInternalFrame is added to the JDesktopPane ancestor of parentComponent, or components parent if one its ancestors isn't a JDesktopPane, or if parentComponent doesn't have a parent then a RuntimeException is thrown.

Parameters:: parentComponent - the parent Component for the internal frame; title - the String to display in the frame's title bar
Returns:: a JInternalFrame containing a JOptionPane

getFrameForComponent

public static Frame getFrameForComponent(Component parentComponent)

Returns the specified component's Frame.

Parameters:: parentComponent - the Component to check for a Frame
Returns:: the Frame that contains the component, or the default frame if the component is null, or does not have a valid Frame parent

getDesktopPaneForComponent

public static JDesktopPane getDesktopPaneForComponent(Component parentComponent)

Returns the specified component's desktop pane.

Parameters:: parentComponent - the Component to check for a desktop
Returns:: the JDesktopPane that contains the component, or null if the component is null or does not have an ancestor that is a JInternalFrame

setRootFrame

public static void setRootFrame(Frame newRootFrame)

Sets the frame to use for class methods in which a frame is not provided.

Parameters:: newRootFrame - the default Frame to use

getRootFrame

public static Frame getRootFrame()

Returns the Frame to use for the class methods in which a frame is not provided.

Returns:: the default Frame to use

setUI

public void setUI(OptionPaneUI ui)

Sets the UI object which implements the L&F for this component.

Parameters:: ui - the OptionPaneUI L&F object
See Also:: UIDefaults.getUI(javax.swing.JComponent)

getUI

public OptionPaneUI getUI()

Returns the UI object which implements the L&F for this component.

Returns:: the OptionPaneUI object

updateUI

public void updateUI()

Notification from the UIManager that the L&F has changed. Replaces the current UI object with the latest version from the UIManager.

Overrides:: updateUI in class JComponent

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the UI class that implements the L&F for this component.

Overrides:: getUIClassID in class JComponent

Returns:: "OptionPaneUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

setMessage

public void setMessage(Object newMessage)

Sets the option pane's message-object.

Parameters:: newMessage - the Object to display
See Also:: getMessage()

getMessage

public Object getMessage()

Returns the message-object this pane displays.

Returns:: the Object that is displayed
See Also:: setMessage(java.lang.Object)

setIcon

public void setIcon(Icon newIcon)

Sets the icon to display. If non-null, the look and feel does not provide an icon.

Parameters:: icon - the Icon to display
See Also:: getIcon()

getIcon

public Icon getIcon()

Returns the icon this pane displays.

Returns:: the Icon that is displayed
See Also:: setIcon(javax.swing.Icon)

setValue

public void setValue(Object newValue)

Sets the value the user has chosen.

Parameters:: newValue - the chosen value
See Also:: getValue()

getValue

public Object getValue()

Returns the value the user has selected. UNINITIALIZED_VALUE implies the user has not yet made a choice, null means the user closed the window with out chosing anything. Otherwise the returned value will be one of the options defined in this object.

Returns:: the Object chosen by the user, UNINITIALIZED_VALUE if the user has not yet made a choice, or null if the user closed the window without making a choice.
See Also:: setValue(java.lang.Object)

setOptions

public void setOptions(Object[] newOptions)

Sets the options this pane displays. If an element in newOptions is a Comonent it is added directly to the pane, Otherwise a button is created for the element.

Parameters:: newOptions - an array of Objects that create the buttons the user can click on, or arbitrary Components to add to the pane
See Also:: getOptions()

getOptions

public Object[] getOptions()

Returns the choices the user can make.

Parameters:: the - array of Objects that give the user's choices
See Also:: setOptions(java.lang.Object[])

setInitialValue

public void setInitialValue(Object newInitialValue)

Sets the initial value that is to be enabled -- the Component that has the focus when the pane is initially displayed.

Parameters:: newInitialValue - the Object that gets the initial keyboard focus
See Also:: getInitialValue()

getInitialValue

public Object getInitialValue()

Returns the initial value.

Returns:: the Object that gets the initial keyboard focus
See Also:: setInitialValue(java.lang.Object)

setMessageType

public void setMessageType(int newType)

Sets the option pane's message type. The message type is used by the look and feel to determine the icon to display (if not supplied) as well as potentially how to lay out the parentComponent.

Parameters:: newType - an int specifying the kind of message to display: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE. Otherwise, a RuntimeEception is thrown.
See Also:: getMessageType()

getMessageType

public int getMessageType()

Returns the message type.

Returns:: an int specifying the message type
See Also:: setMessageType(int)

setOptionType

public void setOptionType(int newType)

Sets the options to display. The option type is used by the look and feel to determine what buttons to show (unless options are supplied).

Parameters:: newType - an int specifying the options the L&F is to display: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION, or OK_CANCEL_OPTION. Otherwise, a RuntimeException is thrown.
See Also:: getOptionType(), setOptions(java.lang.Object[])

getOptionType

public int getOptionType()

Returns the type of options that are displayed.

Returns:: an int specifying the user-selectable options
See Also:: setOptionType(int)

setSelectionValues

public void setSelectionValues(Object[] newValues)

Sets the selection values for a pane that provides the user with a list of items to choose from. (The UI provides a widget for choosing one of the values.)

Sets wantsInput to true. Use setInitialSelectionValue to specify the initially-chosen value. After the pane as been enabled, inputValue is set to the value the user has selected.

Parameters:: newValues - an array of Objects the user to be displayed (usually in a list or combo-box) from which the user can make a selection
See Also:: setWantsInput(boolean), setInitialSelectionValue(java.lang.Object), getSelectionValues()

getSelectionValues

public Object[] getSelectionValues()

Returns the selection values.

Parameters:: return - the array of Objects the user can select
See Also:: setSelectionValues(java.lang.Object[])

setInitialSelectionValue

public void setInitialSelectionValue(Object newValue)

Sets the initial selection value. Only used if wantsInput is true.

Parameters:: newValue - the initially selected value
See Also:: setSelectionValues(java.lang.Object[]), getInitialSelectionValue()

getInitialSelectionValue

public Object getInitialSelectionValue()

Returns the initial-selection value..

Returns:: the initially selected value
See Also:: setInitialSelectionValue(java.lang.Object), setSelectionValues(java.lang.Object[])

setInputValue

public void setInputValue(Object newValue)

Sets the user's input-value.

Parameters:: newValue - the Object used to initialized the value that the user specified (usually in a text field)
See Also:: setSelectionValues(java.lang.Object[]), setWantsInput(boolean), getInputValue()

getInputValue

public Object getInputValue()

Returns the value the user has input, if wantsInput is true.

Returns:: the Object the user specified, if it was one of the objects, or a String if it was a value typed into a field.
See Also:: setSelectionValues(java.lang.Object[]), setWantsInput(boolean), setInputValue(java.lang.Object)

getMaxCharactersPerLineCount

public int getMaxCharactersPerLineCount()

Returns the maximum number of characters to place on a line in a message. Default is to return Integer.MAX_VALUE. The value can be changed by overriding this method in a subclasse.

Returns:: an int giving the maximum number of characters on a line

setWantsInput

public void setWantsInput(boolean newValue)

If newValue is true, a parentComponent is provided to allow the user to input a value. If getSelectionValues returns a non-null the input value is one of the objects in that array. Otherwise the input value is whatever the user inputs.

This is a bound property.

See Also:: setSelectionValues(java.lang.Object[]), setInputValue(java.lang.Object)

getWantsInput

public boolean getWantsInput()

Returns true if a parentComponent will be provided for the user to input.

Returns:: true if a parentComponent will be provided
See Also:: setWantsInput(boolean)

selectInitialValue

public void selectInitialValue()

Requests that the initial value be selected, which will set focus to the initial value. This method should be invoked after the window containing the option pane is made visible.

paramString

protected String paramString()

Returns a string representation of this JOptionPane. 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 JComponent

Returns:: a string representation of this JOptionPane.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext associated with this JComponent

Specified by:: getAccessibleContext in interface Accessible
Overrides:: getAccessibleContext in class JComponent

Returns:: the AccessibleContext of this JComponent

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showConfirmDialog	Asks a confirming question, like yes/no/cancel.
showInputDialog	Prompt for some input.
showMessageDialog	Tell the user about something that has happened.
showOptionDialog	The Grand Unification of the above three.

Inner Class Summary
`protected class`	`JOptionPane.AccessibleJOptionPane` Accessiblity support.

Field Summary
`static int`	`CANCEL_OPTION` Return value from class method if CANCEL is chosen.
`static int`	`CLOSED_OPTION` Return value from class method if user closes window without selecting anything, more than likely this should be treated as either a CANCEL_OPTION or NO_OPTION.
`static int`	`DEFAULT_OPTION` Type meaning look and feel should not supply any options -- only use the options from the JOptionPane.
`static int`	`ERROR_MESSAGE` Used for error messages.
`protected Icon`	`icon` Icon used in pane.
`static String`	`ICON_PROPERTY` Bound property name for icon.
`static int`	`INFORMATION_MESSAGE` Used for information messages.
`static String`	`INITIAL_SELECTION_VALUE_PROPERTY` Bound property name for initialSelectionValue.
`static String`	`INITIAL_VALUE_PROPERTY` Bounds property name for initialValue.
`protected Object`	`initialSelectionValue` Initial value to select in selectionValues.
`protected Object`	`initialValue` Value that should be initialy selected in options.
`static String`	`INPUT_VALUE_PROPERTY` Bound property name for inputValue.
`protected Object`	`inputValue` Value the user has input.
`protected Object`	`message` Message to display.
`static String`	`MESSAGE_PROPERTY` Bound property name for message.
`static String`	`MESSAGE_TYPE_PROPERTY` Bounds property name for type.
`protected int`	`messageType` Message type.
`static int`	`NO_OPTION` Return value from class method if NO is chosen.
`static int`	`OK_CANCEL_OPTION` Type used for showConfirmDialog.
`static int`	`OK_OPTION` Return value form class method if OK is chosen.
`static String`	`OPTION_TYPE_PROPERTY` Bound property name for optionType.
`protected Object[]`	`options` Options to display to the user.
`static String`	`OPTIONS_PROPERTY` Bounds property namer for option.
`protected int`	`optionType` Option type, one of DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION or OK_CANCEL_OPTION.
`static int`	`PLAIN_MESSAGE` No icon is used.
`static int`	`QUESTION_MESSAGE` Used for questions.
`static String`	`SELECTION_VALUES_PROPERTY` Bound property name for selectionValues.
`protected Object[]`	`selectionValues` Array of values the user can choose from.
`static Object`	`UNINITIALIZED_VALUE` Indicates that the user has not yet selected a value.
`protected Object`	`value` Currently selected value, will be a valid option, or UNINITIALIZED_VALUE or null.
`static String`	`VALUE_PROPERTY` Bounds property name for value.
`static String`	`WANTS_INPUT_PROPERTY` Bound property name for wantsInput.
`protected boolean`	`wantsInput` If true, a UI widget will be provided to the user to get input.
`static int`	`WARNING_MESSAGE` Used for warning messages.
`static int`	`YES_NO_CANCEL_OPTION` Type used for showConfirmDialog.
`static int`	`YES_NO_OPTION` Type used for showConfirmDialog.
`static int`	`YES_OPTION` Return value from class method if YES is chosen.

Constructor Summary
`JOptionPane()` Creates a JOptionPane with a test message.
`JOptionPane(Object message)` Creates a instance of JOptionPane to display a message using the plain-message message type and the default options delivered by the UI.
`JOptionPane(Object message, int messageType)` Creates an instance of JOptionPane to display a message with the specified message type and the default options,
`JOptionPane(Object message, int messageType, int optionType)` Creates an instance of JOptionPane to display a message with the specified message type and options.
`JOptionPane(Object message, int messageType, int optionType, Icon icon)` Creates an instance of JOptionPane to display a message with the specified message type, options, and icon.
`JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options)` Creates an instance of JOptionPane to display a message with the specified message type, icon, and options.
`JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options, Object initialValue)` Creates an instance of JOptionPane to display a message with the specified message type, icon, and options, with the inititially-selected option specified.

Method Summary
`JDialog`	`createDialog(Component parentComponent, String title)` Creates and returns a new JDialog wrapping `this` centered on the `parentComponent` in the `parentComponent`'s frame.
`JInternalFrame`	`createInternalFrame(Component parentComponent, String title)` Creates and returns an instance of JInternalFrame.
`AccessibleContext`	`getAccessibleContext()` Get the AccessibleContext associated with this JComponent
`static JDesktopPane`	`getDesktopPaneForComponent(Component parentComponent)` Returns the specified component's desktop pane.
`static Frame`	`getFrameForComponent(Component parentComponent)` Returns the specified component's Frame.
`Icon`	`getIcon()` Returns the icon this pane displays.
`Object`	`getInitialSelectionValue()` Returns the initial-selection value..
`Object`	`getInitialValue()` Returns the initial value.
`Object`	`getInputValue()` Returns the value the user has input, if `wantsInput` is true.
`int`	`getMaxCharactersPerLineCount()` Returns the maximum number of characters to place on a line in a message.
`Object`	`getMessage()` Returns the message-object this pane displays.
`int`	`getMessageType()` Returns the message type.
`Object[]`	`getOptions()` Returns the choices the user can make.
`int`	`getOptionType()` Returns the type of options that are displayed.
`static Frame`	`getRootFrame()` Returns the Frame to use for the class methods in which a frame is not provided.
`Object[]`	`getSelectionValues()` Returns the selection values.
`OptionPaneUI`	`getUI()` Returns the UI object which implements the L&F for this component.
`String`	`getUIClassID()` Returns the name of the UI class that implements the L&F for this component.
`Object`	`getValue()` Returns the value the user has selected.
`boolean`	`getWantsInput()` Returns true if a parentComponent will be provided for the user to input.
`protected String`	`paramString()` Returns a string representation of this JOptionPane.
`void`	`selectInitialValue()` Requests that the initial value be selected, which will set focus to the initial value.
`void`	`setIcon(Icon newIcon)` Sets the icon to display.
`void`	`setInitialSelectionValue(Object newValue)` Sets the initial selection value.
`void`	`setInitialValue(Object newInitialValue)` Sets the initial value that is to be enabled -- the Component that has the focus when the pane is initially displayed.
`void`	`setInputValue(Object newValue)` Sets the user's input-value.
`void`	`setMessage(Object newMessage)` Sets the option pane's message-object.
`void`	`setMessageType(int newType)` Sets the option pane's message type.
`void`	`setOptions(Object[] newOptions)` Sets the options this pane displays.
`void`	`setOptionType(int newType)` Sets the options to display.
`static void`	`setRootFrame(Frame newRootFrame)` Sets the frame to use for class methods in which a frame is not provided.
`void`	`setSelectionValues(Object[] newValues)` Sets the selection values for a pane that provides the user with a list of items to choose from.
`void`	`setUI(OptionPaneUI ui)` Sets the UI object which implements the L&F for this component.
`void`	`setValue(Object newValue)` Sets the value the user has chosen.
`void`	`setWantsInput(boolean newValue)` If `newValue` is true, a parentComponent is provided to allow the user to input a value.
`static int`	`showConfirmDialog(Component parentComponent, Object message)` Brings up a modal dialog with the options Yes, No and Cancel; with the title, "Select an Option".
`static int`	`showConfirmDialog(Component parentComponent, Object message, String title, int optionType)` Brings up a modal dialog where the number of choices is determined by the `optionType` parameter.
`static int`	`showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType)` Brings up a modal dialog where the number of choices is determined by the `optionType` parameter, where the `messageType` parameter determines the icon to display.
`static int`	`showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon)` Brings up a modal dialog with a specified icon, where the number of choices is determined by the `optionType` parameter.
`static String`	`showInputDialog(Component parentComponent, Object message)` Shows a question-message dialog requesting input from the user parented to `parentComponent`.
`static String`	`showInputDialog(Component parentComponent, Object message, String title, int messageType)` Shows a dialog requesting input from the user parented to `parentComponent` with the dialog having the title `title` and message type `messageType`.
`static Object`	`showInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue)` Prompts the user for input in a blocking dialog where the initial selection, possible selections, and all other options can be specified.
`static String`	`showInputDialog(Object message)` Shows a question-message dialog requesting input from the user.
`static int`	`showInternalConfirmDialog(Component parentComponent, Object message)` Brings up an internal dialog panel with the options Yes, No and Cancel; with the title, "Select an Option".
`static int`	`showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType)` Brings up a internal dialog panel where the number of choices is determined by the `optionType` parameter.
`static int`	`showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType)` Brings up an internal dialog panel where the number of choices is determined by the `optionType` parameter, where the `messageType` parameter determines the icon to display.
`static int`	`showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon)` Brings up an internal dialog panel with a specified icon, where the number of choices is determined by the `optionType` parameter.
`static String`	`showInternalInputDialog(Component parentComponent, Object message)` Shows an internal question-message dialog requesting input from the user parented to `parentComponent`.
`static String`	`showInternalInputDialog(Component parentComponent, Object message, String title, int messageType)` Shows an internal dialog requesting input from the user parented to `parentComponent` with the dialog having the title `title` and message type `messageType`.
`static Object`	`showInternalInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue)` Prompts the user for input in a blocking internal dialog where the initial selection, possible selections, and all other options can be specified.
`static void`	`showInternalMessageDialog(Component parentComponent, Object message)` Brings up an internal confirmation dialog panel.
`static void`	`showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType)` Brings up an internal dialog panel that displays a message using a default icon determined by the messageType parameter.
`static void`	`showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon)` Brings up an internal dialog panel displaying a message, specifying all parameters.
`static int`	`showInternalOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue)` Brings up an internal dialog panel with a specified icon, where the initial choice is dermined by the `initialValue` parameter and the number of choices is determined by the `optionType` parameter.
`static void`	`showMessageDialog(Component parentComponent, Object message)` Brings up a confirmation dialog -- a modal information-message dialog titled "Confirm".
`static void`	`showMessageDialog(Component parentComponent, Object message, String title, int messageType)` Brings up a dialog that displays a message using a default icon determined by the messageType parameter.
`static void`	`showMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon)` Brings up a dialog displaying a message, specifying all parameters.
`static int`	`showOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue)` Brings up a modal dialog with a specified icon, where the initial choice is dermined by the `initialValue` parameter and the number of choices is determined by the `optionType` parameter.
`void`	`updateUI()` Notification from the UIManager that the L&F has changed.

Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JOptionPane - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

javax.swing Class JOptionPane

UNINITIALIZED_VALUE

DEFAULT_OPTION

YES_NO_OPTION

YES_NO_CANCEL_OPTION

OK_CANCEL_OPTION

YES_OPTION

NO_OPTION

CANCEL_OPTION

OK_OPTION

CLOSED_OPTION

ERROR_MESSAGE

INFORMATION_MESSAGE

WARNING_MESSAGE

QUESTION_MESSAGE

PLAIN_MESSAGE

ICON_PROPERTY

MESSAGE_PROPERTY

VALUE_PROPERTY

OPTIONS_PROPERTY

INITIAL_VALUE_PROPERTY

MESSAGE_TYPE_PROPERTY

OPTION_TYPE_PROPERTY

SELECTION_VALUES_PROPERTY

INITIAL_SELECTION_VALUE_PROPERTY

INPUT_VALUE_PROPERTY

WANTS_INPUT_PROPERTY

icon

message

options

initialValue

messageType

optionType

value

selectionValues

inputValue

initialSelectionValue

wantsInput

JOptionPane

JOptionPane

JOptionPane

JOptionPane

JOptionPane

JOptionPane

JOptionPane

showInputDialog

showInputDialog

showInputDialog

showInputDialog

showMessageDialog

showMessageDialog

showMessageDialog

showConfirmDialog

showConfirmDialog

showConfirmDialog

showConfirmDialog

showOptionDialog

createDialog

showInternalMessageDialog

showInternalMessageDialog

showInternalMessageDialog

showInternalConfirmDialog

showInternalConfirmDialog

showInternalConfirmDialog

showInternalConfirmDialog

showInternalOptionDialog

showInternalInputDialog

showInternalInputDialog

showInternalInputDialog

createInternalFrame

getFrameForComponent

getDesktopPaneForComponent

setRootFrame

getRootFrame

setUI

getUI

updateUI

getUIClassID

setMessage

javax.swing
Class JOptionPane