Java Programming

I should be able to figure this out, but I'm completely lost.

The following code deals a hand of a set number of cards:

private void deal(Hand hand, int toDeal)
    {
        for (int j = 0; j < toDeal; j++)
        {
            Hand temp = hand.handCards();
            Card[] s = new Card[temp.getNumCards() + 1];
            Card[] q = hand.getHand(); 
            for (int k = 0; k < temp.getNumCards(); k++)
            {
                s[k] = q[k];
            }
            s[s.length - 1] = deck.dealCard(); // ***THE METHOD SHOWN BELOW***
            hand.setHand(s);
        }
    }

deck.dealCard():

  public Card dealCard()
    {
        Card toDeal = cards.get(numCards());
        cards.remove(numCards());
        return toDeal;
    }

to call it I run:

deal(playerHand, 5);

How do I make a method to add these cards back into the deck (the cards from the temp array)?

Thank you,
any ideas or code greatly appreciated