public class Aliases {
   public static void main(String[] args) {
      Person p1 = new Person("Dimmu");
      Person p2 = new Person("Borgir");
      p1.makeFriends(p2);
      System.out.println(p1);
      System.out.println(p2);
   }
}

class Person {
   private String name; 
   private Person friend;
   public Person(String name) { this.name = name; }
   public void setFriend(Person friend) { this.friend = friend; }
   public void makeFriends(Person friend) {
      friend.friend = this;
      this.friend = friend;
   }  
   public String toString() {
      return "I am "+name+", and my friend's name is "+friend.name+".";
   }
}