Making library of books

To have library we can have 2 components for sure:
1. Books
2. Person borrowing that books

So we need a person class

class Person
{
 String name;
 public Person (String n)
 {
  name = n;
 }

 public String details ()
 {
  return name;
 }

 public String toString()
 {
  return "name <"+name+">";
 }
}

Person must take membership from library...so something has to be added to above

class Membership
{
 public boolean canLoan(int onLoan)
 {
  return false;
 }
}

class JuniorMember extends Membership
{
 public boolean canLoan(int onLoan)
 {
  return onLoan<1;
 }
 public String toString()
 {
  return "Junior";
 }
}

class StandardMember extends Membership
{
 public boolean canLoan(int onLoan)
 {
  return onLoan<6;
 }
 public String toString()
 {
  return "Standard";
 }
}

class OAPMember extends Membership
{
 public boolean canLoan(int onLoan)
 {
  Calendar now = Calendar.getInstance();
  int day = now.get(Calendar.DAY_OF_WEEK);
  //if (day==Calendar.SATURDAY || day==Calendar.SUNDAY)
  if (day == Calendar.THURSDAY)
   return false;
  return true;
 }
 public String toString()
 {
  return "OAP";
 }
}

We have to add how many books person borrowed...so we have to add following function:

 So now person class become:

public class Person
{
 String name;
 Membership mem;
 int books;
 public Person (String n, Membership member)
 {
  name = n;
  mem = member;
 }

 public boolean borrow(Book b)
 {
  if (b.canLoan() && mem.canLoan(books))
  {
   books++;
   return true;
  }
  return false;
 }

 public String details ()
 {
  return name+":"+mem;
 }

 public String toString()
 {
  return "name <"+name+"> "+mem;
 }
}