Java JOptionPane

In Java, JOptionPane is a part of the Java Swing library. It helps us to create dialog boxes such as message dialogs, conformation dialogs, input dialogs, and options dialogs In this article, we are going to explore some constructors, methods, and some examples of JOptionPane.

Constructors of JOptionPane Class

This is the default constructor for JOptionPane.It is used to create a JOptionPane with no options and message.

It creates a message dialog with a specified message.

JOptionPane(Object message, int messageType)

It creates a message dialog with a specified message and its Type.

JOptionPane(Object message, int messageType, int optionType)

It helps us to create a dialog with a specified message, message type, and option type.

Methods of JOptionPane

It helps us to create JDialog with a specified title but without any parent.

showMessageDialog(Component parentComponent, Object message)

This method displays a message dialog with the specified message.

showInputDialog(Component parentComponent, Object message)

This method displays an input dialog with the specified message.

This method to set the message type of the dialog

This method allows you to set the option type for the dialog.

Here we can set a list of custom options.

This method sets the initial selection when using custom options in the dialog.

Fields of JOptionPane

A Constant code displaying an error message icon.

A Constant code displaying information message icon.

A Constant code for displaying Warning message icon.

A constant for creating a dialog with “Yes” and “No” options.

A constant for creating a dialog with “Yes,” “No,” and “Cancel” options.

A constant for creating a dialog with “OK” and “Cancel” options.

Classes from Which JOptionPane Methods are inherited

• java.awt.Component
• javax.swing.JComponent
• java.io.Serializable

Following are the programs to implement JOptionPane

1. Java program to create a showMessageDialog in JOptionPane

This dialog is used to display messages to the user.

Java

// The fourth parameter (JOptionPane.INFORMATION_MESSAGE) specifies the message type (information icon)

Output:

2. Java Program to create a showInputDialog in JOptionPane

This dialog is used to take input from the user.

Java

Output:

Final Output After Selection:

3. Java Program to create showConfirmDialog in JOptionPane

This dialog displays a confirmation message and allows the user to make a decision.

Java

// If the user chose 'Cancel' or closed the dialog, show a message indicating the operation is canceled

Output:

Final Output After Selection:

4. Java Program to create a showOptionDialog in JOptionPane

This dialog allows you to create a customized option dialog.

Java

Output:

Final Output After Selection:

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