//Question23.java
//Solution to Self-Test Question 23, page 168, Chapter 23.

import javax.swing.JOptionPane;

public class Question23
{
    public static void main(String[] args)
    {
        boolean adult = false;
        //Initialized to keep the compiler happy.

        int answer = JOptionPane.showConfirmDialog(null,
            "Are you 18 years old or older?",
            "Age Check", JOptionPane.YES_NO_OPTION);

        if (answer == JOptionPane.YES_OPTION)
            adult = true;
        else if (answer == JOptionPane.NO_OPTION)
            adult = false;
        else
            System.out.println("Error");

        if (adult)
            JOptionPane.showMessageDialog(null, "You are old enough.");
        else
            JOptionPane.showMessageDialog(null, "Sorry. you must be 18.");
        System.exit(0);
    }
}