Extending books to loanable and reference books

class LoanBook extends Book
{
 public LoanBook (String t, String a, int c1, int c2, float p)
 {
  super(t,a,c1,c2,p);
 }
 
 public boolean canLoan()
 {
  return true;
 }
 
 public String details ()
 {
  return "Loan: "+super.details();
 }

 public String toString()
 {
  return "loan: "+super.toString();
 }
}

class ReferenceBook extends Book
{
 public ReferenceBook (String t, String a, int c1, int c2, float p)
 {
  super(t,a,c1,c2,p);
 }
 
 public boolean canLoan()
 {
  return false;
 }
 
 public String details ()
 {
  return "Reference: "+super.details();
 }

 public String toString()
 {
  return "Ref: "+super.toString();
 }
}



class Loan
{
 Book book;
 Person person;
 Date date = new Date();

 public Loan (Book b, Person p)
 {
  book = b;
  person = p;
 }

 public String details ()
 {
  return book.details()+" loaned on "+date+" to "+person.details();
 }

 public String toString()
 {
  return "book "+book+" -> person"+person+" @date "+date;
 }
}

public class Library
{
 public static void main(String[] args)
 {
  Book b1 = new LoanBook ("Java I/O Programming","E.R.Harrold",123,45,18.99F);
  Book b2 = new LoanBook ("Java in a Nutshell","D.Flanagan",123,25,12.99F);
  Book b3 = new ReferenceBook ("The Java CLass Libraries","P.Chan & R.Lee",2123,10,35.00F);

  System.out.println("Books");
  System.out.println(b1);
  System.out.println(b2);
  System.out.println(b3);
  System.out.println("");
  
  System.out.println("People:");
  Person james = new Person ("James Gosling");
  System.out.println(james);
  System.out.println("");

  Loan l1 = makeLoan(james, b1);
  Loan l2 = makeLoan(james, b2);
  Loan l3 = makeLoan(james, b3);
 }

 private static Loan makeLoan(Person p, Book b)
 {
  Loan l=null;
  if (b.canLoan())
  {
   l = new Loan(b,p);
   System.out.println(l.details());
  }
  else
   System.out.println("Cannot loan "+b.details()+" to "+p.details());
  System.out.println("");
  return l;
 }
 

}