01219343/unit/poker

This exercise is part of 01219343-55.

Follow the TDD steps to write these classes.

Card

A card has a rank (A,1,...,9,10,J,Q,K) and a suit (S,H,D,C) (see suit).

Implement class Card that supports the following methods:

• Construction with rank and suit as strings. (This might not be an efficient way to represent ranks and suits, but it simplifies the exercise.) For example:

Card card = new Card("10","S");

• Getters: getRank and getSuit.
• hasSameRank(Card c) that returns true when c has the same rank.
• hasSameSuit(Card c) that returns true when c has the same suit.
• The class should implement interface Comparable<Card> so that we can easily sort the cards. Add that interface to the class and implement a public method int compareTo(Card c).

Make sure you test these method thoroughly. When fixing a broken tast, write the simplest possible code that make the test passes.

Given a list of Cards, we want to use Collections.sort to sort the list. Make sure you have a test case that checks this requirement.

Notes: To create a list of Cards, you can use method Arrays.asList, e.g.,

List<Card> cards = Arrays.asList(new Card("10","S"), new Card("9", "D"), new Card("A","C"));

@Before

You may see yourself creating the same objects many times inside various test methods. You can put all these initialization into one method by annotating the method with @Before.

public class CardTest {

	Card S10, SA;
	
	@Before
	public void initCards() {
		S10 = new Card("10","S");
		SA = new Card("A","S");
	}
}

Hand

Use this reference of poker hands from wikipedia.

Write class PokerHand that provides the following interface.

• Construction: you can construct a PokerHand by a list of 5 Cards. If the number of cards in the list is not 5, the constructor should raise an exception.

• getHighestCard

• isStraightFlush
• isFourOfAKind
• isFullHouse
• isFlush
• isStraight
• isThreeOfAKind
• isTwoPair
• isOnePair
• isNoPair

Note that while a straight flush hand contains cards with the same suit, it is not considered a flush. Any poker hand can belong to only one category.