JOptionPane can be used to create message, input, and confirm dialogs in Java. Message dialogs display a message using showMessageDialog() with options to set the title, icon, and message type. Input dialogs prompt the user for input using showInputDialog() and return the user's response as a string. Confirm dialogs ask the user to confirm or deny using showConfirmDialog() and return an integer value indicating the user's choice.

1. <1> ♋ Bero
JOptionPane
Message, input,
and confirm dialogs

2. <2> ♋ Bero
 JOptionPane can be used to create different types of dialogs:
 Firstly…
import javax.swing.JOptionPane;
JOptionPane
Message dialog
Input dialog
Confirm dialog

3. <3> ♋ Bero
1) Message dialogs:
There are several overloaded versions of showMessageDialog( )
1.1) JOptionPane.showMessageDialog(Component, Message);
Example:
JOptionPane.showMessageDialog(null, “Hello world”);
1.2) JOptionPane.showMessageDialog(Component, Message, Title,
MessageType);
Example:
JOptionPane.showMessageDialog(null, “Hello world”, “My Message”,
JOptionPane.PLAIN_MESSAGE);
The graphical component in
which the message dialog
will be displayed within.
The message that will
be displayed.
Null indicates
message will appear
in the centre of the
screen.
A string
representing the
title of the message.
The icon of the message changes
according to type passed.

4. <4> ♋ Bero
 Message icon Types:
Example:
JOptionPane.showMessageDialog(null, “Hello world”, “My Message”,
JOptionPane.WARNING_MESSAGE);
The numeric value of the icon can be passed as a parameter as well.
Example:
JOptionPane.showMessageDialog(null, “Hello world”, “My Message”, 0);

5. <5> ♋ Bero
2) Input dialogs:
- Overloaded forms of showInputDialog( ):
2.1) String x = JOptionPane.showInputDialog(“prompt message”);
Example:
String x = JOptionPane.showInputDialog(“Enter a
value: ”);
2.2) String x = JOptionPane.showInputDialog(“message”, InitialValue);
Example:
String x = JOptionPane.showInputDialog(“Enter a value: ”, 0);
2.3) String x = JOptionPane.showInputDialog(Component, “message”,
“Title”, IconType);
Example:
String x = JOptionPane.showInputDialog(null, “Enter a value: ”, “Input
value”, 1);
A variable of type string to
hold the value entered by the
user.
Message that will appear on the dialog.

6. <6> ♋ Bero
3) Confirm dialogs:
- Overloaded forms of showConfirmDialog( ):
3.1) int y = JOptionPane.showConfirmDialog(Component, “Message”);
Example:
int y = JOptionPane.showConfirmDialog(null, “Are you sure?”);
3.2) int y = JOptionPane.showConfirmDialog(Component, “Message”,
“Title”, OptionType);
Example:
int y = JOptionPane.showConfirmDialog(null, “Are you sure?”,
“Confirm”, JOptionPane.YES_NO_OPTION);
Holds a value depending on the user’s
choice (yes (0), no (1), or cancel (2)).
 Buttons appearing on dialog:
- YES_NO_CANCEL_OPTION
- YES_NO_OPTION
- YES_OPTION