// *********************************************************************
//   References2.java   (Lab material from [Lewis & Loftus])
//
//   Illustrates references versus primitive variables
// *********************************************************************

//do the import!

public class References2
{
   public static void main (String[] args)
   {
      int age1, age2, age3;

      System.out.println ("Enter three ages...");
     // age1 = ; read them in!
     // age2 = ;
     // age3 = ;
 
      // Instantiate three Person objects with the ages read in
      Person person1 = new Person ("Rachel", age1);
      Person person2 = new Person ("Elly", age2);
      Person person3 = new Person ("Sarah", age3);

      System.out.println();
      System.out.println ("The original three people...");
      System.out.println (person1 + ", " + person2 + ", " + person3);
 
      // Reassign ages in the int variables 
      age1 = age2;
      age3 = age2;

      // Reassign the Person objects 
      person1 = person2;
      person3 = person2;

      System.out.println ();
      System.out.println ("The changed values are...");
      System.out.println ("Ages (ints): " + age1 + ", " + age2 + ", " + age3);
      System.out.println (person1 + ", " + person2 + ", " + person3);

      // Make some changes to the integer values and corresponding objects
      System.out.println ("\nChanging the second age to 99...");
      age2 = 99;
      person2.changeAge(age2);  

      System.out.println ("The changed values are...");
      System.out.println ("Ages (ints): " + age1 + ", " + age2 + ", " + age3);
      System.out.println (person1 + ", " + person2 + ", " + person3);

      System.out.println(); 
      System.out.println ("Changing the first age to 100...");
      age1 = 100;
      person1.changeAge(age1);
 
      System.out.println ("The changed values are...");
      System.out.println ("Ages (ints): " + age1 + ", " + age2 + ", " + age3);
      System.out.println (person1 + ", " + person2 + ", " + person3);
   }
}