JOptionPane: showConfirmDialog

The method joptionpane.showConfirmDialog()  Creates a small confirmation window represented in a dialog box asking the user to confirm their choice. For example, a dialog box with two buttons "yes" and "no".

int return = showConfirmDialog(parent, message, title, typeOption,  typeMessage), or:
  • parent: is the window from which the call is made;
  • message: the message to be displayed in the dialog box;
  • title: the title of the dialog box;
  • typeOption: the option that will display the "Yes", "No", "Ok" and "Cancel" buttons:  YES_NO_OPTION, YES_NO_CANCEL_OPTION, and OK_CANCEL_OPTION;
  • typeMessage: the message type and icon, the types are:  INFORMATION_MESSAGE, WARNING_MESSAGE, ERROR_MESSAGE, and PLAIN_MESSAGE.
This method is a function that returns an integer which is the choice made by the user. Here's an example that shows how to use the showConfirmDialog():

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JOptionPane; 

public class MessageDialog {
 public static void main(String[] args) {
 JFrame window = new JFrame(); 
 window.setLocationRelativeTo(null); 
 window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
 window.setVisible(true); 
 JButton leave = new JButton("Exit"); 
 window.add(exit); 
 exit.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent arg0) {
 // TODO Auto-generated method stub
 int return = showConfirmDialog(); 
 if(return==0)//if the button clicked is "yes"
 System.exit(0); 
 }
 }); 
 window.add(exit); 
 window.pack(); 
 }
 
 static int showConfirmDialog(){
 return JOptionPane.showConfirmDialog(
 null,
 "Are you sure you want to quit?",
 "Exit",
 JOptionPane.YES_NO_OPTION); 
 }
}
Result:

JOptionPane: Dialog box showConfirmDialog

If you click "Yes", the program ends by calling the method System.exit(0), otherwise no event will occur when you click the "No" button.

References:
Java2s:  Create a Confirm Dialog Box : JOptionPane Dialog
Java Doc: showConfirmDialog method