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Introduction
Introduction
Now that the Card and Deck classes are completed, the next class to design is ElevensBoard.
Questions Answer in your google doc!
Questions Answer in your google doc!
- What items would be necessary if you were playing a game of Elevens in real life?
- List the private instance variables needed for the ElevensBoard class.
- Write a general pseudo-code algorithm that describes the actions that happen when you play the Elevens game.
- Make a class called ElevensBoard and copy/paste the code below into it. How does it compare to the actions you expected to have available in question 3?
- ElevensBoard has three helper methods. They are marked private because no other classes would ever need to access them.
- Where is the dealMyCards method called?
- Which public methods should call the containsPairSum11 and containsJQK methods?
- It's important to understand how the cardIndexes method works. It's especially important to understand how the list that it returns is used. Suppose that cards contains the elements shown below. After calling cardIndexes, what list will be returned?
5. Which one of the methods that you identified in question 4(2) needs to call the cardIndexes method before calling the containsPairSum11 and containsJQK methods? Why?
5. Complete the following printCards method that would print out all the elements of cards that are indexed by cIndexes.
ElevensBoard
ElevensBoard
import java.util.List;import java.util.ArrayList;/** * The ElevensBoard class represents the board in a game of Elevens. */public class ElevensBoard { /** * The size (number of cards) on the board. */ private static final int BOARD_SIZE = 9; /** * The ranks of the cards for this game to be sent to the deck. */ private static final String[] RANKS = {"ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "jack", "queen", "king"}; /** * The suits of the cards for this game to be sent to the deck. */ private static final String[] SUITS = {"spades", "hearts", "diamonds", "clubs"}; /** * The values of the cards for this game to be sent to the deck. */ private static final int[] POINT_VALUES = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 0, 0}; /** * The cards on this board. */ private Card[] cards; /** * The deck of cards being used to play the current game. */ private Deck deck; /** * Flag used to control debugging print statements. */ private static final boolean I_AM_DEBUGGING = false; /** * Creates a new <code>ElevensBoard</code> instance. */ public ElevensBoard() { cards = new Card[BOARD_SIZE]; deck = new Deck(RANKS, SUITS, POINT_VALUES); if (I_AM_DEBUGGING) { System.out.println(deck); System.out.println("----------"); } dealMyCards(); } /** * Start a new game by shuffling the deck and * dealing some cards to this board. */ public void newGame() { deck.shuffle(); dealMyCards(); } /** * Accesses the size of the board. * Note that this is not the number of cards it contains, * which will be smaller near the end of a winning game. * @return the size of the board */ public int size() { return cards.length; } /** * Determines if the board is empty (has no cards). * @return true if this board is empty; false otherwise. */ public boolean isEmpty() { for (int k = 0; k < cards.length; k++) { if (cards[k] != null) { return false; } } return true; } /** * Deal a card to the kth position in this board. * If the deck is empty, the kth card is set to null. * @param k the index of the card to be dealt. */ public void deal(int k) { cards[k] = deck.deal(); } /** * Accesses the deck's size. * @return the number of undealt cards left in the deck. */ public int deckSize() { return deck.size(); } /** * Accesses a card on the board. * @return the card at position k on the board. * @param k is the board position of the card to return. */ public Card cardAt(int k) { return cards[k]; } /** * Replaces selected cards on the board by dealing new cards. * @param selectedCards is a list of the indices of the * cards to be replaced. */ public void replaceSelectedCards(List<Integer> selectedCards) { for (Integer k : selectedCards) { deal(k.intValue()); } } /** * Gets the indexes of the actual (non-null) cards on the board. * * @return a List that contains the locations (indexes) * of the non-null entries on the board. */ public List<Integer> cardIndexes() { List<Integer> selected = new ArrayList<Integer>(); for (int k = 0; k < cards.length; k++) { if (cards[k] != null) { selected.add(new Integer(k)); } } return selected; } /** * Generates and returns a string representation of this board. * @return the string version of this board. */ public String toString() { String s = ""; for (int k = 0; k < cards.length; k++) { s = s + k + ": " + cards[k] + "\n"; } return s; } /** * Determine whether or not the game has been won, * i.e. neither the board nor the deck has any more cards. * @return true when the current game has been won; * false otherwise. */ public boolean gameIsWon() { if (deck.isEmpty()) { for (Card c : cards) { if (c != null) { return false; } } return true; } return false; } /** * Determines if the selected cards form a valid group for removal. * In Elevens, the legal groups are (1) a pair of non-face cards * whose values add to 11, and (2) a group of three cards consisting of * a jack, a queen, and a king in some order. * @param selectedCards the list of the indices of the selected cards. * @return true if the selected cards form a valid group for removal; * false otherwise. */ public boolean isLegal(List<Integer> selectedCards) { /* *** TO BE IMPLEMENTED IN ACTIVITY 9 *** */ } /** * Determine if there are any legal plays left on the board. * In Elevens, there is a legal play if the board contains * (1) a pair of non-face cards whose values add to 11, or (2) a group * of three cards consisting of a jack, a queen, and a king in some order. * @return true if there is a legal play left on the board; * false otherwise. */ public boolean anotherPlayIsPossible() { /* *** TO BE IMPLEMENTED IN ACTIVITY 9 *** */ } /** * Deal cards to this board to start the game. */ private void dealMyCards() { for (int k = 0; k < cards.length; k++) { cards[k] = deck.deal(); } } /** * Check for an 11-pair in the selected cards. * @param selectedCards selects a subset of this board. It is list * of indexes into this board that are searched * to find an 11-pair. * @return true if the board entries in selectedCards * contain an 11-pair; false otherwise. */ private boolean containsPairSum11(List<Integer> selectedCards) { /* *** TO BE IMPLEMENTED IN ACTIVITY 9 *** */ } /** * Check for a JQK in the selected cards. * @param selectedCards selects a subset of this board. It is list * of indexes into this board that are searched * to find a JQK group. * @return true if the board entries in selectedCards * include a jack, a queen, and a king; false otherwise. */ private boolean containsJQK(List<Integer> selectedCards) { /* *** TO BE IMPLEMENTED IN ACTIVITY 9 *** */ }}Report abuse