// This program will show off a couple introductory facets of using objects
public class PersonClient {
   public static void main(String[] args) {
      // Java will implement a default constructor that will set 
      // fields to their "null-equivalent" value. For the String name,
      // it will be null, and for age it will be 0
      Person p = new Person();
      System.out.println(p.name);
      System.out.println(p.age);
      
      // We could change our fields like so
      p.name = "Paul";
      p.age = 51;
      
      // We can create multiple instances of a class.
      // Each of these objects and their fields are independant
      // of each other.
      Person t = new Person();
      t.name = "Tyler";
      t.age = 22;
      
      // Here we see that changing "t"'s fields didn't change "p"'s
      System.out.println(p.name);
      System.out.println(p.age);
      System.out.println(t.name);
      System.out.println(t.age);
      
      // We can call a method on specific object and again, that will
      // use and change that specific objects fields, independant of 
      // the other
      t.celebrateBirthday();
      System.out.println(p.name);
      System.out.println(p.age);
      System.out.println(t.name);
      System.out.println(t.age);      
   }
}