Source of Question23.java

Structures and functions

public class Question23

  1: //Question23.java
  2: //Solution to Self-Test Question 23, page 168, Chapter 23.
  3: 
  4: import javax.swing.JOptionPane;
  5: 
  6: public class Question23
  7: {
  8:     public static void main(String[] args)
  9:     {
 10:         boolean adult = false;
 11:         //Initialized to keep the compiler happy.
 12: 
 13:         int answer = JOptionPane.showConfirmDialog(null,
 14:             "Are you 18 years old or older?",
 15:             "Age Check", JOptionPane.YES_NO_OPTION);
 16: 
 17:         if (answer == JOptionPane.YES_OPTION)
 18:             adult = true;
 19:         else if (answer == JOptionPane.NO_OPTION)
 20:             adult = false;
 21:         else
 22:             System.out.println("Error");
 23: 
 24:         if (adult)
 25:             JOptionPane.showMessageDialog(null, "You are old enough.");
 26:         else
 27:             JOptionPane.showMessageDialog(null, "Sorry. you must be 18.");
 28:         System.exit(0);
 29:     }
 30: }