Implementacja interfejsu Collection

Jak zdefiniować metody addAll(), removeAll(),retainAll(),containsAll() dla inteffejsu Collection:

import java.util.*;
import pets.Pet;
import pets.Pets;
public class CollectionSequence2 implements Collection<Pet> 
{
	private Pet[] pets = Pets.createArray(8);
	public boolean contains(Object p)
	{
		for(int i=0;i<pets.length;i++)
		{
			if(p==pets[i])return true;
		}
		return false;
	}
	public Pet remove(Pet p){return new Pet();}
	public Iterator<Pet> iterator()
	{
		return new Iterator<Pet>()
		{
			//.....
		};
	}
	public Pet[] toArray(){return new Pet[1];} 
	public Pet[] toArray(Object[] p){return new Pet[pets.length];} 
	public void removeAll(){}
	public boolean add(Pet p){return true;}
	public void clear(){return;}
	public int size(){return pets.length;}
	public boolean remove(Object o){ return true;}
	public boolean isEmpty(){return false;}
	public boolean removeAll(CollectionSequence2<Pet> c){return true;}//  ????
	public boolean retainAll(CollectionSequence2<Pet> c){return true;}
	public boolean containsAll(CollectionSequence2<Pet> c){return true;}
	public boolean addAll(CollectionSequence2<Pet> c){return true;}
}

dokumetacja do Collection: http://java.sun.com/javase/6/docs/api/java/util/Collection.html