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Java 8 - Collect and Shuffle List or Stream
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class="text-gray-500 hover:text-gray-700 transition duration-150 ease-in-out">Home</a><svg class="flex-shrink-0 mx-2 h-5 w-5 text-gray-600" viewBox="0 0 20 20" fill="currentColor"><path fill-rule="evenodd" d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z" clip-rule="evenodd"></path></svg><span class="text-gray-500">Bytes</span></div><div class="py-2"><h1 class="text-3xl font-bold leading-7 sm:text-4xl sm:leading-9">Java 8 - Collect and Shuffle List or Stream</h1><div class="flex items-center mt-4"><div><img class="inline-block h-8 w-8 rounded-full ring-2 ring-gray-200" src="//s3.stackabuse.com/media/users/865cd7d217ea11c9d9555c4f666e2d73.jpg" alt=""/></div><div class="ml-4"><a href="/author/david/" class="text-gray-500 hover:text-gray-700">David Landup</a></div><div></div></div></div></div></div><div style="color:#ffffff"><svg class="mt-4 transform rotate-180" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 65"><path fill="currentColor" fill-opacity="1" d="M0,64L60,53.3C120,43,240,21,360,10.7C480,0,600,0,720,10.7C840,21,960,43,1080,48C1200,53,1320,43,1380,37.3L1440,32L1440,0L1380,0C1320,0,1200,0,1080,0C960,0,840,0,720,0C600,0,480,0,360,0C240,0,120,0,60,0L0,0Z"></path></svg></div></div><div class="mt-8 grid grid-cols-1 md:grid-cols-24 mx-2 md:mx-0 md:ml-8 md:gap-8"><div class="hidden md:block lg:col-span-3"></div><div class="col-span-13"><div><div class=" my-4 flex justify-center" style="min-height:90px"><div id="adngin-top_leaderboard-0"></div></div><div class="mt-8 content"><noscript><style>.lazyload-placeholder { display: none; }</style></noscript><p>In this short Byte - we'll take a look at how you can collect and shuffle a list in Java, using the Functional API, and paired with the <code>collectingAndThen()</code> collector.</p> <div class="alert alert-reference"> <div class="flex"> <div class="flex-shrink-0 mr-3"> <img src="/assets/images/icon-link-solid.svg" class="icon" aria-hidden="true"/> </div> <div class="w-full"> <p><strong>Advice:</strong> If you'd like to read more about <code>collectingAndThen()</code> - read our in-depth <a target="_blank" href="https://stackabuse.com/guide-to-java-8-collectors-collectingandthen/"><em>"Guide to Java 8 Collectors: collectingAndThen()"!</em></a></p> </div> </div> </div> <h3 id="collectandshufflealistinjava">Collect and Shuffle a List in Java</h3> <p>When collecting a stream back into a list (streamed from a Java <code>Collection</code>) - you may decide to shuffle it. Using Java 8's Functional API - working with streams is efficient and simple.</p> <p>An intuitive method to make use of here is <code>collectingAndThen()</code> which allows you to <code>collect()</code> a <code>Stream</code> and then run an anonymous function on the result:</p> <pre><code class="hljs"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Shuffle</span> </span>{ <span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> Stream<?> stream; <span class="hljs-keyword">public</span> List<?> getList() { <span class="hljs-keyword">return</span> stream.collect( collectingAndThen( toList(), l -> { Collections.shuffle(l); <span class="hljs-keyword">return</span> l; } ) ); } } </code></pre> <p>Here, we've collected the stream into a <code>List</code>, which is a <em>terminal operation</em> (ending the stream). Then, that list is streamed again, utilizing the central <code>Collections.shuffle()</code> method, which accepts any valid <code>Collection</code> and shuffles it in-place.</p> <p>You can test the method and assert the correct output with:</p> <pre><code class="hljs"><span class="hljs-meta">@Test</span> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">shouldShuffleList</span><span class="hljs-params">()</span> </span>{ Shuffle shuffle = <span class="hljs-keyword">new</span> Shuffle(Stream.of(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>)); List<?> list = shuffle.getList(); assertNotEquals(<span class="hljs-string">"[1, 2, 3]"</span>, list.toString()); } </code></pre> <h2 id="conclusion">Conclusion</h2> <p>In this short Byte - we took a look at how you can collect and shuffle a list or stream in Java 8+.</p> </div><div class="md:flex 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Using Java 8's Functional API - working with streams is efficient and simple.\u003c/p\u003e\n\u003cp\u003eAn intuitive method to make use of here is \u003ccode\u003ecollectingAndThen()\u003c/code\u003e which allows you to \u003ccode\u003ecollect()\u003c/code\u003e a \u003ccode\u003eStream\u003c/code\u003e and then run an anonymous function on the result:\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"hljs\"\u003e\u003cspan class=\"hljs-keyword\"\u003epublic\u003c/span\u003e \u003cspan class=\"hljs-class\"\u003e\u003cspan class=\"hljs-keyword\"\u003eclass\u003c/span\u003e \u003cspan class=\"hljs-title\"\u003eShuffle\u003c/span\u003e \u003c/span\u003e{\n \u003cspan class=\"hljs-keyword\"\u003eprivate\u003c/span\u003e \u003cspan class=\"hljs-keyword\"\u003efinal\u003c/span\u003e Stream\u0026lt;?\u0026gt; stream;\n \n \u003cspan class=\"hljs-keyword\"\u003epublic\u003c/span\u003e List\u0026lt;?\u0026gt; getList() {\n \u003cspan class=\"hljs-keyword\"\u003ereturn\u003c/span\u003e stream.collect(\n collectingAndThen(\n toList(),\n l -\u0026gt; {\n Collections.shuffle(l);\n \u003cspan class=\"hljs-keyword\"\u003ereturn\u003c/span\u003e l;\n }\n )\n );\n } \n}\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003eHere, we've collected the stream into a \u003ccode\u003eList\u003c/code\u003e, which is a \u003cem\u003eterminal operation\u003c/em\u003e (ending the stream). Then, that list is streamed again, utilizing the central \u003ccode\u003eCollections.shuffle()\u003c/code\u003e method, which accepts any valid \u003ccode\u003eCollection\u003c/code\u003e and shuffles it in-place.\u003c/p\u003e\n\u003cp\u003eYou can test the method and assert the correct output with:\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"hljs\"\u003e\u003cspan class=\"hljs-meta\"\u003e@Test\u003c/span\u003e\n\u003cspan class=\"hljs-function\"\u003e\u003cspan class=\"hljs-keyword\"\u003epublic\u003c/span\u003e \u003cspan class=\"hljs-keyword\"\u003evoid\u003c/span\u003e \u003cspan class=\"hljs-title\"\u003eshouldShuffleList\u003c/span\u003e\u003cspan class=\"hljs-params\"\u003e()\u003c/span\u003e \u003c/span\u003e{\n Shuffle shuffle = \u003cspan class=\"hljs-keyword\"\u003enew\u003c/span\u003e Shuffle(Stream.of(\u003cspan class=\"hljs-number\"\u003e1\u003c/span\u003e,\u003cspan class=\"hljs-number\"\u003e2\u003c/span\u003e,\u003cspan class=\"hljs-number\"\u003e3\u003c/span\u003e));\n List\u0026lt;?\u0026gt; list = shuffle.getList();\n \n assertNotEquals(\u003cspan class=\"hljs-string\"\u003e\u0026quot;[1, 2, 3]\u0026quot;\u003c/span\u003e, list.toString());\n}\n\u003c/code\u003e\u003c/pre\u003e\n\u003ch2 id=\"conclusion\"\u003eConclusion\u003c/h2\u003e\n\u003cp\u003eIn this short Byte - we took a look at how you can collect and shuffle a list or stream in Java 8+.\u003c/p\u003e\n","parent_id":null,"type":"byte","visibility":"public","img_feature":null,"is_featured":false,"locale":"en","custom_excerpt":null,"inject_header":null,"inject_footer":null,"canonical_url":null,"comment_id":null,"og_image":null,"og_title":null,"og_description":null,"twitter_image":null,"twitter_title":null,"twitter_description":null,"meta_title":null,"meta_description":"In this short Byte - learn how to collect and shuffle a stream or list in Java 8.","read_time_min":4,"published_at":1672975800000,"created_at":1674052124556,"updated_at":1674052339137,"contributors":[{"id":16,"name":"David Landup","slug":"david","role_id":2,"img_profile":"//s3.stackabuse.com/media/users/865cd7d217ea11c9d9555c4f666e2d73.jpg","img_cover":null,"bio_html":"\u003cp\u003eEntrepreneur, Software and Machine Learning Engineer, with a deep fascination towards the application of Computation and Deep Learning in Life Sciences (Bioinformatics, Drug Discovery, Genomics), Neuroscience (Computational Neuroscience), robotics and BCIs.\u003c/p\u003e\n\u003cp\u003eGreat passion for accessible education and promotion of reason, science, humanism, and progress.\u003c/p\u003e\n","website":"https://www.linkedin.com/in/david-landup-859455144/","location":"Serbia","facebook":"","twitter":"","github":null,"created_at":1534532687000,"updated_at":1692629560355,"role":"editor","_pivot_content_id":1736,"_pivot_user_id":16,"_pivot_role":"author","_pivot_sort_order":0},{"id":55,"name":"Hiram Kamau","slug":"hiram-k","role_id":4,"img_profile":"//s3.stackabuse.com/media/users/f38ed4ea2cc8a6b544f2db97e1e403f3.jpeg","img_cover":null,"bio_html":"\u003cp\u003eIn addition to catching code errors and going through debugging hell, I also obsess over whether writing in an active voice is truly better than doing it in passive.\u003c/p\u003e\n","website":"https://www.upwork.com/freelancers/~0157b88d591b73eb50","location":"Nairobi, Kenya","facebook":null,"twitter":"@hkamau_xight","github":"IdelsTak","created_at":1577973227000,"updated_at":1697580361272,"role":"author","_pivot_content_id":1736,"_pivot_user_id":55,"_pivot_role":"author","_pivot_sort_order":1}],"tags":[{"id":13,"name":"java","slug":"java","img_cover":null,"description_html":"","og_image":null,"og_title":null,"og_description":null,"twitter_image":null,"twitter_title":null,"twitter_description":null,"meta_title":null,"meta_description":null,"inject_header":null,"inject_footer":null,"canonical_url":null,"color":null,"created_at":1431358735000,"updated_at":1431358735000,"_pivot_content_id":1736,"_pivot_tag_id":13,"_pivot_sort_order":0},{"id":150,"name":"streams","slug":"streams","img_cover":null,"description_html":"","og_image":null,"og_title":null,"og_description":null,"twitter_image":null,"twitter_title":null,"twitter_description":null,"meta_title":null,"meta_description":null,"inject_header":null,"inject_footer":null,"canonical_url":null,"color":null,"created_at":1572451232000,"updated_at":1572451232000,"_pivot_content_id":1736,"_pivot_tag_id":150,"_pivot_sort_order":1}]},"relatedContent":[],"relatedCollections":[],"error":null},"__N_SSP":true},"page":"/bytes/[slug]","query":{"slug":"java-8-collect-and-shuffle-list-or-stream"},"buildId":"1740324887682","isFallback":false,"isExperimentalCompile":false,"gssp":true,"scriptLoader":[]}</script></body></html>