public class Rabbit implements Comparable<Rabbit>
{
    private final String breed;
    private final double birthdate;
    private final String iD;
    
    @SuppressWarnings("unused")
    private Rabbit() 
    {
	breed=null;
	birthdate=0;
	iD=null;
    }
    
    public Rabbit(String breed, double bday, String id)
    {
	this.breed=breed;
	this.birthdate=bday;
	this.iD=id;
    }
    
    public String toString()
    {
	return String.format("%s  %s  %10.4f", breed,  iD, birthdate);
    }
    
    public String getId() { return iD; }


    @Override
    public int compareTo(Rabbit r)
    {
	return iD.compareTo(r.getId());
    }
    
}