| <!DOCTYPE html> |
| <!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]--> |
| <!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]--> |
| <!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]--> |
| <!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]--><head> |
| <meta charset='utf-8'/><meta http-equiv='X-UA-Compatible' content='IE=edge'/><meta name='viewport' content='width=device-width, initial-scale=1'/><meta name='keywords' content='eclipse collections, groovy, @Sortable, records'/><meta name='description' content='This post highlights some code for modelling and manipulating cards with records, JDK collections, and Eclipse Collections.'/><title>The Apache Groovy programming language - Blogs - Deck of cards with Groovy, JDK collections and Eclipse Collections</title><link href='../img/favicon.ico' type='image/x-ico' rel='icon'/><link rel='stylesheet' type='text/css' href='../css/bootstrap.css'/><link rel='stylesheet' type='text/css' href='../css/font-awesome.min.css'/><link rel='stylesheet' type='text/css' href='../css/style.css'/><link rel='stylesheet' type='text/css' href='https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.css'/> |
| </head><body> |
| <div id='fork-me'> |
| <a href='https://github.com/apache/groovy'> |
| <img style='position: fixed; top: 20px; right: -58px; border: 0; z-index: 100; transform: rotate(45deg);' src='/img/horizontal-github-ribbon.png'/> |
| </a> |
| </div><div id='st-container' class='st-container st-effect-9'> |
| <nav class='st-menu st-effect-9' id='menu-12'> |
| <h2 class='icon icon-lab'>Socialize</h2><ul> |
| <li> |
| <a href='https://groovy-lang.org/mailing-lists.html' class='icon'><span class='fa fa-envelope'></span> Discuss on the mailing-list</a> |
| </li><li> |
| <a href='https://twitter.com/ApacheGroovy' class='icon'><span class='fa fa-twitter'></span> Groovy on Twitter</a> |
| </li><li> |
| <a href='https://groovy-lang.org/events.html' class='icon'><span class='fa fa-calendar'></span> Events and conferences</a> |
| </li><li> |
| <a href='https://github.com/apache/groovy' class='icon'><span class='fa fa-github'></span> Source code on GitHub</a> |
| </li><li> |
| <a href='https://groovy-lang.org/reporting-issues.html' class='icon'><span class='fa fa-bug'></span> Report issues in Jira</a> |
| </li><li> |
| <a href='http://stackoverflow.com/questions/tagged/groovy' class='icon'><span class='fa fa-stack-overflow'></span> Stack Overflow questions</a> |
| </li><li> |
| <a href='http://groovycommunity.com/' class='icon'><span class='fa fa-slack'></span> Slack Community</a> |
| </li> |
| </ul> |
| </nav><div class='st-pusher'> |
| <div class='st-content'> |
| <div class='st-content-inner'> |
| <!--[if lt IE 7]> |
| <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> to improve your experience.</p> |
| <![endif]--><div><div class='navbar navbar-default navbar-static-top' role='navigation'> |
| <div class='container'> |
| <div class='navbar-header'> |
| <button type='button' class='navbar-toggle' data-toggle='collapse' data-target='.navbar-collapse'> |
| <span class='sr-only'></span><span class='icon-bar'></span><span class='icon-bar'></span><span class='icon-bar'></span> |
| </button><a class='navbar-brand' href='../index.html'> |
| <i class='fa fa-star'></i> Apache Groovy |
| </a> |
| </div><div class='navbar-collapse collapse'> |
| <ul class='nav navbar-nav navbar-right'> |
| <li class=''><a href='https://groovy-lang.org/learn.html'>Learn</a></li><li class=''><a href='https://groovy-lang.org/documentation.html'>Documentation</a></li><li class=''><a href='/download.html'>Download</a></li><li class=''><a href='https://groovy-lang.org/support.html'>Support</a></li><li class=''><a href='/'>Contribute</a></li><li class=''><a href='https://groovy-lang.org/ecosystem.html'>Ecosystem</a></li><li class=''><a href='/blog'>Blog posts</a></li><li class=''><a href='https://groovy.apache.org/events.html'></a></li><li> |
| <a data-effect='st-effect-9' class='st-trigger' href='#'>Socialize</a> |
| </li><li class=''> |
| <a href='../search.html'> |
| <i class='fa fa-search'></i> |
| </a> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div><div id='content' class='page-1'><div class='row'><div class='row-fluid'><div class='col-lg-3'><ul class='nav-sidebar'><li><a href='./'>Blog index</a></li><li class='active'><a href='#doc'>Deck of cards with Groovy, JDK collections and Eclipse Collections</a></li></ul><br/><ul class='nav-sidebar'><li style='padding: 0.35em 0.625em; background-color: #eee'><span>Related posts</span></li><li><a href='./deep-learning-and-eclipse-collections'>Deep Learning and Eclipse Collections</a></li><li><a href='./groovy-records'>Groovy Records</a></li><li><a href='./groovy-record-performance'>Groovy Record Performance</a></li><li><a href='./comparators-and-sorting-in-groovy'>Comparators and Sorting in Groovy</a></li><li><a href='./groovy-null-processing'>Groovy Processing Nulls In Lists</a></li><li><a href='./groovy-list-processing-cheat-sheet'>Groovy List Processing Cheat Sheet</a></li><li><a href='./lego-bricks-with-groovy'>Lego Bricks with Groovy</a></li><li><a href='./reading-and-writing-csv-files'>Reading and Writing CSV files with Groovy</a></li><li><a href='./using-groovy-with-apache-wayang'>Using Groovy with Apache Wayang and Apache Spark</a></li><li><a href='./groovy-haiku-processing'>Groovy Haiku processing</a></li><li><a href='./wordle-checker'>Checking Wordle with Groovy</a></li><li><a href='./zipping-collections-with-groovy'>Zipping Collections with Groovy</a></li><li><a href='./fruity-eclipse-collections'>Fruity Eclipse Collections</a></li></ul></div><div class='col-lg-8 col-lg-pull-0'><a name='doc'></a><h1>Deck of cards with Groovy, JDK collections and Eclipse Collections</h1><p><span>Author: <i>Paul King</i></span><br/><span>Published: 2022-09-23 10:18AM (Last updated: 2022-09-25 11:15AM)</span></p><hr/><div class="paragraph"> |
| <p>Once again, <a href="https://twitter.com/TheDonRaab">Donald Raab</a> has produced an interesting |
| <a href="https://donraab.medium.com/how-to-create-a-deck-of-cards-using-eclipse-collections-d9838ac430b7">blog post</a> on |
| <a href="https://github.com/eclipse/eclipse-collections">Eclipse Collections</a> this one shows some code for modelling and manipulating cards with Java 17 and Eclipse Collections. His related katas are highly recommended. |
| Here is the same example in Groovy (4.0.5 was used here) with just a few tweaks:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="prettyprint highlight"><code data-lang="groovy">enum Rank { ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING } |
| |
| enum Suit { SPADES, DIAMONDS, HEARTS, CLUBS } |
| |
| @Sortable(includes='suit,rank') |
| record Card(Rank rank, Suit suit) { } |
| |
| var cards = Sets.cartesianProduct(EnumSet.allOf(Rank), EnumSet.allOf(Suit), Card::new) |
| var cardsBySuit = cards.groupBy(Card::suit) |
| var cardsByRank = cards.groupBy(Card::rank) |
| |
| assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13 ,4] |
| |
| var random = new Random(42L) |
| var deck = cards.toList().shuffleThis(random).shuffleThis(random).shuffleThis(random).toStack() |
| (1..5).collect(i -> deck.pop(5).toSortedList()).each(this::println)</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>And here is the output:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>[Card[rank=FOUR, suit=SPADES], Card[rank=FOUR, suit=DIAMONDS], Card[rank=SIX, suit=HEARTS], Card[rank=NINE, suit=CLUBS], Card[rank=JACK, suit=CLUBS]] |
| [Card[rank=FIVE, suit=DIAMONDS], Card[rank=TWO, suit=HEARTS], Card[rank=FIVE, suit=HEARTS], Card[rank=TEN, suit=CLUBS], Card[rank=QUEEN, suit=CLUBS]] |
| [Card[rank=FIVE, suit=SPADES], Card[rank=NINE, suit=SPADES], Card[rank=QUEEN, suit=SPADES], Card[rank=THREE, suit=DIAMONDS], Card[rank=TWO, suit=CLUBS]] |
| [Card[rank=EIGHT, suit=SPADES], Card[rank=TWO, suit=DIAMONDS], Card[rank=EIGHT, suit=DIAMONDS], Card[rank=KING, suit=HEARTS], Card[rank=FIVE, suit=CLUBS]] |
| [Card[rank=SIX, suit=SPADES], Card[rank=KING, suit=DIAMONDS], Card[rank=THREE, suit=HEARTS], Card[rank=TEN, suit=HEARTS], Card[rank=QUEEN, suit=HEARTS]]</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>We can do a similar example with the built-in JDK collections and make some additional tweaks for nicer output:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="prettyprint highlight"><code data-lang="groovy">enum Rank { |
| ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING |
| String toString() { ['A', *'2'..'9', '10', 'J', 'Q', 'K'][ordinal()] } |
| } |
| |
| enum Suit { |
| SPADES, DIAMONDS, HEARTS, CLUBS |
| String toString() { '♠♦♥♣'[ordinal()] } |
| } |
| |
| @Sortable(includes='suit,rank') |
| record Card(Rank rank, Suit suit) { |
| Card(List srPair) { this(srPair[1], srPair[0]) } |
| String toString() { "${rank}${suit}" } |
| } |
| |
| var cards = [Suit.values(), Rank.values()].combinations().collect(Card::new) |
| var cardsBySuit = cards.groupBy(Card::suit) |
| var cardsByRank = cards.groupBy(Card::rank) |
| |
| assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13, 4] |
| |
| var random = new Random(42L) |
| 3.times { cards.shuffle(random) } |
| var deck = cards as Stack |
| 5.times { println "Hand ${it+1}: ${(0..5).collect{ deck.pop() }.sort()}" } |
| |
| println "Remaining cards sorted:\n${deck.sort()}"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Which has this output:</p> |
| </div> |
| <div class="paragraph"> |
| <p><span class="image"><img src="img/CardsConsole.png" alt="Cards" width="740"></span></p> |
| </div> |
| <div class="paragraph"> |
| <p>Both these Groovy examples run on JDK versions from 8 to 19<br> |
| (emulated records are used in JDK versions 8 to 15).</p> |
| </div> |
| <div class="sidebarblock"> |
| <div class="content"> |
| <div class="title">Update history</div> |
| <div class="paragraph"> |
| <p><strong>25/Sep/2022</strong>: Tweaked to use the same ordering for the JDK collections version.</p> |
| </div> |
| </div> |
| </div></div></div></div></div><footer id='footer'> |
| <div class='row'> |
| <div class='colset-3-footer'> |
| <div class='col-1'> |
| <h1>Groovy</h1><ul> |
| <li><a href='https://groovy-lang.org/learn.html'>Learn</a></li><li><a href='https://groovy-lang.org/documentation.html'>Documentation</a></li><li><a href='/download.html'>Download</a></li><li><a href='https://groovy-lang.org/support.html'>Support</a></li><li><a href='/'>Contribute</a></li><li><a href='https://groovy-lang.org/ecosystem.html'>Ecosystem</a></li><li><a href='/blog'>Blog posts</a></li><li><a href='https://groovy.apache.org/events.html'></a></li> |
| </ul> |
| </div><div class='col-2'> |
| <h1>About</h1><ul> |
| <li><a href='https://github.com/apache/groovy'>Source code</a></li><li><a href='https://groovy-lang.org/security.html'>Security</a></li><li><a href='https://groovy-lang.org/learn.html#books'>Books</a></li><li><a href='https://groovy-lang.org/thanks.html'>Thanks</a></li><li><a href='http://www.apache.org/foundation/sponsorship.html'>Sponsorship</a></li><li><a href='https://groovy-lang.org/faq.html'>FAQ</a></li><li><a href='https://groovy-lang.org/search.html'>Search</a></li> |
| </ul> |
| </div><div class='col-3'> |
| <h1>Socialize</h1><ul> |
| <li><a href='https://groovy-lang.org/mailing-lists.html'>Discuss on the mailing-list</a></li><li><a href='https://twitter.com/ApacheGroovy'>Groovy on Twitter</a></li><li><a href='https://groovy-lang.org/events.html'>Events and conferences</a></li><li><a href='https://github.com/apache/groovy'>Source code on GitHub</a></li><li><a href='https://groovy-lang.org/reporting-issues.html'>Report issues in Jira</a></li><li><a href='http://stackoverflow.com/questions/tagged/groovy'>Stack Overflow questions</a></li><li><a href='http://groovycommunity.com/'>Slack Community</a></li> |
| </ul> |
| </div><div class='col-right'> |
| <p> |
| The Groovy programming language is supported by the <a href='http://www.apache.org'>Apache Software Foundation</a> and the Groovy community. |
| </p><div text-align='right'> |
| <img src='../img/asf_logo.png' title='The Apache Software Foundation' alt='The Apache Software Foundation' style='width:60%'/> |
| </div><p>Apache® and the Apache feather logo are either registered trademarks or trademarks of The Apache Software Foundation.</p> |
| </div> |
| </div><div class='clearfix'>© 2003-2023 the Apache Groovy project — Groovy is Open Source: <a href='http://www.apache.org/licenses/LICENSE-2.0.html' alt='Apache 2 License'>license</a>, <a href='https://privacy.apache.org/policies/privacy-policy-public.html'>privacy policy</a>.</div> |
| </div> |
| </footer></div> |
| </div> |
| </div> |
| </div> |
| </div><script src='../js/vendor/jquery-1.10.2.min.js' defer></script><script src='../js/vendor/classie.js' defer></script><script src='../js/vendor/bootstrap.js' defer></script><script src='../js/vendor/sidebarEffects.js' defer></script><script src='../js/vendor/modernizr-2.6.2.min.js' defer></script><script src='../js/plugins.js' defer></script><script src='https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.js'></script><script>document.addEventListener('DOMContentLoaded',prettyPrint)</script><script> |
| (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ |
| (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), |
| m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) |
| })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); |
| |
| ga('create', 'UA-257558-10', 'auto'); |
| ga('send', 'pageview'); |
| </script> |
| </body></html> |