public class Aliases2 {
   public static void main(String[] args) {
      Book b1 = new Book("Stand on Zanzibar");
      System.out.println(b1);
      Book b2 = b1;
      b2.pages = 100;
      System.out.println(b1.pages);
   }
}

class Book {
   public int pages;
   public String name;
   public Book(String name) {
      this.name=name;
   }
   public String toString() {
      return name;
   }
}