import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class StartScreen {

    public static void main(String[] args) {
        JOptionPane.showConfirmDialog(null, "Would you like to create a new room?", "New", JOptionPane.YES_NO_OPTION);
        
    }
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("FrameDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel emptyLabel = new JLabel("Booooo");
        emptyLabel.setPreferredSize(new Dimension(200, 100));
        frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);

        //Display the window.
        frame.pack();
        frame.setVisible(true);

        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

public static void main(String[] args) {
        int result = JOptionPane.showConfirmDialog(null, "Would you like to create a new room?", "New", JOptionPane.YES_NO_OPTION);
        if(result == 1){
           //1 code
        }
        else{
           //other code
        }
    }