JOptionPane is used to prompt up a dialog to accept user input or informs a message, four types of dialog are supported: Message dialog, Confirmation dialog, Input dialog, and Options dialog.
Today we get learn how to use JoptionPane showmessagedialog – tutorial and example.
3 static methods are defined in class JOptionPane you can directly call neither one to create a dialog and display a message in dialog:
- public static void showMessageDialog(Component parentComponent,
Object message) throws HeadlessException; - public static void showMessageDialog(Component parentComponent,
Object message, String title, int messageType) throws HeadlessException - public static void showMessageDialog(Component parentComponent,
Object message, String title, int messageType, Icon icon) throws HeadlessException
They have a common parameter parentComponent, it defines the Component that is to be the parent of this dialog box. messageType defines the style of the message and possible value are listed below:
/** Used for error messages. */
public static final int ERROR_MESSAGE = 0;
/** Used for information messages. */
public static final int INFORMATION_MESSAGE = 1;
/** Used for warning messages. */
public static final int WARNING_MESSAGE = 2;
/** Used for questions. */
public static final int QUESTION_MESSAGE = 3;
/** No icon is used. */
public static final int PLAIN_MESSAGE = -1;
public static final int ERROR_MESSAGE = 0;
/** Used for information messages. */
public static final int INFORMATION_MESSAGE = 1;
/** Used for warning messages. */
public static final int WARNING_MESSAGE = 2;
/** Used for questions. */
public static final int QUESTION_MESSAGE = 3;
/** No icon is used. */
public static final int PLAIN_MESSAGE = -1;
joptionpane showmessagedialog example source code:
public static void main(String[] args) {
String[] choices = {"Value One", "Value Two", "None of your business", "Quit"};
int response = JOptionPane.showOptionDialog(
null // Center in window.
, "How did you vote?" // Message
, "Party Poll" // Title in titlebar
, JOptionPane.YES_NO_OPTION // Option type
, JOptionPane.PLAIN_MESSAGE // messageType
, null // Icon (none)
, choices // Button text as above.
, "None of your business" // Default button's label
);
//The first usage for joptionpane showmessagedialog example
JOptionPane.showMessageDialog(null, "You choose " + choices[response]);
//The second usage for joptionpane showmessagedialog example
JOptionPane.showMessageDialog(null, "You choose " + choices[response], "JavaRMI.com", JOptionPane.INFORMATION_MESSAGE);
//The third usage for joptionpane showmessagedialog example
Icon icon = new ImageIcon("images/myImage.gif");
JOptionPane.showMessageDialog(null, "You choose " + choices[response], "JavaRMI.com", JOptionPane.INFORMATION_MESSAGE, icon);
}