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Home > AP Courses and Exams > Course Home Pages > High/Low Card Game High/Low Card Game by Evelyn Rothman Arthur L. Johnson High School Clark, New Jersey High/Low Card Game Overview Simulate a deck of playing cards Shuffle the deck Deal (5) cards into the hand Turn over the first card Leave the remaining (4) face down The user must guess whether the next card is higher or lower Turn over the next card If the user guesses correctly, the game continues If the use is guesses incorrectly, the game is over and the user loses If the user guesses correctly (4) times, the game is over and the user wins Objectives Using classes to represent objects Card  CardDeck  Hand  Public and private methods Using data structures Two-dimensional array (card deck) ArrayList or array (hand) Using the compareTo method Card class implements Comparable  Order is the rank Implementing the card deck shuffle Each Card in turn is swapped with a random Card Level Advanced Placement Computer Science Reinforces the objectives specified above Time required Four or five 45 minute classes Guide to the Teacher Concepts Create and use classes: Card, CardDeck, Hand The Comparable Interface The Card class compareTo method compares the ranks of two Card objects Data Structures: ArrayList, array Create a permutation of objects (i.e., shuffle the CardDeck) Create a GUI Prerequisites Before starting this project, students should have an understanding of the following: Strings Methods Arrays and/or ArrayLists  The Comparable Interface and the compareTo method Classes and objects Applets Notes I introduce this project in the Advanced Placement course to reinforce the concepts stated above. Before the students begin the High/Low applet, we work as a class on the Card, CardDeck and Hand classes  Some methods are done as a class; others I have the students do individually the creation of an ordered CardDeck  an algorithm for shuffling the CardDeck  dealing Cards  After they complete the High/Low Card Game, students can go on to write programs for card games that are more complex, such as Blackjack or War. For a greater challenge, consider games which require students to extend the Card class (e.g., card ranks differ from 2,3,...,Jack,Queen,King,Ace) and/or the CardDeck class (e.g., Old Maid eliminates one Queen: see http://saturn.cs.ukzn.ac.za/~robd/2005/courses/comp200/pracs/05prac06/oldmaid.html ) High/Low Card Game - Expected Results Students will write the High/Low Card Game Applet which will behave as follows: A new CardDeck is constructed and shuffled A Hand of 5* Cards is dealt; the image of the first Card is shown face up, and the remaining 4 are face down (card back image) The user guesses Higher/Lower If the user is correct, the game continues If the user is incorrect, the game ends If the user guesses correctly 4 times (i.e., all card images a re face up) the user wins Play Again Re-initialize New CardDeck, shuffle, deal Variables re-initialized Of course, the number of Cards in the Hand can be greater or less than five. This lesson can be introduced using the included Card Project presentation (.ppt/225kb) Completed code (.pdf/19kb) for the classes and applet are also included. Evelyn Rothman is a member of the Computer Science Teachers Association (CSTA). See also... AP Computer Science A Course Home Page AP Computer Science AB Course Home Page Teachers' Resources

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