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Back to the Deck Test
Now that Card implements equals, we can rewrite the Deck method contains to take advantage of that fact:
public boolean contains(Rank rank, Suit suit) {
return cards.contains(new Card(rank, suit));
}
Hmm...what if we choose to put Card objects into a hash-based collection, such as a Set or a HashMap? Try it:
Set<Card> set = new HashSet<Card>(); set.add(new Card(Rank.ace, Suit.spades)); assertTrue(set.contains(new Card(Rank.ace, Suit.spades)));
Next time, we’ll figure out how to get this test to pass by implementing hashCode.