class Person
{
 protected String name;
 protected Date dateOfBirth;
 
 public Person(int d,int m,int y,String n) throws PersonException
 {
  try
     {
      name=n;
      dateOfBirth = new Date(d,m,y);
     }
  catch(DateException e)
     {
      throw new PersonException("Invalid date-of-birth: "+
                                 e.getMessage()+" for "+n);
     }
 } 

 public String toString()
 {
  return "Name: "+name+"\nDate of birth: "+dateOfBirth+"\n";
 }

 public boolean older(Person p)
 {
  return dateOfBirth.lessThan(p.dateOfBirth);
 }

 public boolean older(Date d)
 {
  return dateOfBirth.lessThan(d);
 }

 public boolean beforeAlphabetically(Person p)
 {
  return name.compareTo(p.name)<0;
 }

}