Java dialogue box

In this post, you will learn about the Java dialogue box.

The dialogue box is a graphical control element in the form of a small window that communicates information to the user and prompts them for a response.

Java provides several classes to create dialogue boxes, like JOptionPane, JDialog, and JFrame. Here, we have used the JOptionPane class of Java.

JOptionPane class

The JOptionPane is a class that is used to provide standard dialogue boxes. This Java class belongs to the javax.swing package and extends the Dialog class. The dialog boxes can be of any type such as input dialog box, , message dialog box or confirm dialog box. We must include the following statement before the program's class header.

import javax.swing.JOptionPane;

The JOptionPane class inherits JComponent class.

public class JOptionPane extends JComponent implements Accessible  

These are the following constructors of the JOptionPane class.

• JOptionPane() - It is used to generate a JOptionPane containing a test message.
• JOptionPane(Object message) - It is used to create an instance of JOptionPane to display a message.
• JOptionPane(Object message, int messageType) - It is used to create an instance of JOptionPane to display a message with the specified message type and default options.

By using the static method of this class, we can create and customise several different kinds of dialogs. These are some static methods belonging to the JOptionPane class.

• showMessageDialog() - It is used to relay a message to the user.
• showConfirmDialog() - It is used to ask a question that requires confirmation.
• showInputDialog() - It is used to prompt a user for input.
• showOptionDialog() - It is a combination of the three other methods.

Simple JOptionPane Dialogue Box Example

import javax.swing.JOptionPane; 
public class DialogBox
{ 
	public static void main(String[] args) 
        { 
			JOptionPane.showMessageDialog(null, "Dialogbox Example"); 
        } 
}

JOptionPane Dialogue Box: showMessageDialog()

In the given Java program, we have used the showMessageDialog() method to relay a message to the user.

import javax.swing.*;  
public class DialogBoxMessage {  
	JFrame f;  
	DialogBoxMessage(){  
		f=new JFrame();  
		JOptionPane.showMessageDialog(f,"Welcome to eTutorialsPoint!");  
	}  
	public static void main(String[] args) {  
		new DialogBoxMessage();  
	}  
}  

JOptionPane Dialogue Box: showInputDialog()

In the given Java program, we have used the showInputDialog() method to prompt a user for input.

import javax.swing.*;  
public class InputDialogBox {  
JFrame f;  
InputDialogBox(){  
    f=new JFrame();   
    String name=JOptionPane.showInputDialog(f,"Enter Name");      
}  
public static void main(String[] args) {  
    new InputDialogBox();  
}  
} 

JOptionPane Dialogue Box: showConfirmDialog()

In the given Java program, we have used the showConfirmDialog() method to ask a question that requires confirmation.

import javax.swing.*;  
import java.awt.event.*;  
public class DialogBoxExample extends WindowAdapter{  
	JFrame frm;  
	DialogBoxExample(){  
		frm=new JFrame();   
		frm.addWindowListener(this);  
		frm.setSize(300, 300);  
		frm.setLayout(null);  
		frm.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);  
		frm.setVisible(true);  
	}  
	public void windowClosing(WindowEvent e) {  
		int x = JOptionPane.showConfirmDialog(frm,"Are you sure?");  
		if(x == JOptionPane.YES_OPTION){  
			frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
		}  
	}  
	public static void main(String[] args) {  
		new  DialogBoxExample();  
	}     
}  

JOptionPane Dialogue Box: Show error message

This class provide some static constants that we can use in parameter to show some message types, like- PLAIN_MESSAGE, ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE etc.

import javax.swing.JOptionPane; 
public class DialogBox
{ 
	public static void main( String[] args )
	{
	JOptionPane.showMessageDialog( null, "Something Went Wrong.." , "Error as Title",
	JOptionPane.ERROR_MESSAGE );
	}
}

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