import javax.swing.JOptionPane;

class Test {
    public static void main(String[] args) {
        System.out.println("Test desu");
        JOptionPane.showMessageDialog(null, "Test desu");

        int res = JOptionPane.showConfirmDialog(null, "Are you sure?");
        if (res == JOptionPane.YES_OPTION) {
            JOptionPane.showMessageDialog(null, "You clicked YES");
        } else if (res == JOptionPane.NO_OPTION) {
            JOptionPane.showMessageDialog(null, "You clicked NO");
        } else if (res == JOptionPane.CANCEL_OPTION) {
            JOptionPane.showMessageDialog(null, "You clicked CANCEL");
        } else if (res == JOptionPane.CLOSED_OPTION) {
            JOptionPane.showMessageDialog(null, "You clicked CLOSED");
        }
    }
}