// An application with a class that provides information about a person.
class People
{
     public static void main (String [] args)
     {
          Person person = new Person ();
          person.readData ();
          person.calculateAge ();
          person.displayAge ();
     } // main method
} // class People
 
// Class that stores information about a person's name and age.
class Person
{
     private String name;
     private int age, birthYear;
 
     // A method to read data from the keyboard.  It uses a buffered reader.
     public void readData ()
     {
          try
          {
               BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in));
               System.out.print ("Name: ");
               name = stdin.readLine ();
               System.out.print ("Year of Birth: ");
               birthYear = Integer.parseInt (stdin.readLine ());
          }
          catch (IOException e) { System.out.println ("I/O error");}
          catch (NumberFormatException ex) { System.out.println ("Number format error.");}
     } // method readData
 
    // calculateAge determines a person's age, assuming that he or she was born on January 1.
     public void calculateAge ()
     {
          age = 2004 - birthYear;
     } // calculateAge
 
     // Method that displays the name and age of a person.
     public void displayAge ()
     {
          System.out.println (name + "'s age is " + age);
     } // method displayAge
} // class Person