{"id":121191,"date":"2024-05-08T09:58:12","date_gmt":"2024-05-08T08:58:12","guid":{"rendered":"https:\/\/www.baeldung.com\/?p=180589"},"modified":"2024-05-08T09:58:12","modified_gmt":"2024-05-08T08:58:12","slug":"convert-a-queue-to-a-list","status":"publish","type":"post","link":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/2024\/05\/08\/convert-a-queue-to-a-list\/","title":{"rendered":"Convert a Queue to a List"},"content":{"rendered":"

\"Contact<\/p>\n

1. Overview<\/h2>\n
<\/div>\n

In this tutorial, we\u2019ll learn how to convert a Queue<\/em><\/a> object into a List\u00a0<\/em>in Java.<\/p>\n

We’ll explain several popular ways of doing this along with their implementations, and we’ll end each section with a test case to test the respective implementation.<\/p>\n

2. Ways to Convert Queue<\/em> to List<\/em><\/h2>\n
<\/div>\n

In this section, we\u2019ll cover different ways to convert the Queue<\/em> to a List<\/em> using standard Java classes and methods. We’re assuming a non-null queue for all examples.<\/p>\n

2.1. Using the ArrayList<\/em>\u00a0Constructor<\/h3>\n
<\/div>\n

The ArrayList<\/em><\/a> constructor provides the easiest and most common way to convert a Queue<\/em>\u00a0to an\u00a0ArrayList<\/em>.<\/p>\n

The idea is to pass the Queue<\/em>\u00a0as a parameter to the\u00a0ArrayList<\/em> constructor<\/strong>:<\/p>\n

List<String> list = new ArrayList<>(queue);<\/code><\/pre>\n
The constructor new ArrayList<>(queue) <\/em>efficiently inserts all of the queue<\/em> elements into the new ArrayList<\/em>.<\/p>\n
2.2. Using the addAll()<\/em> method<\/h3>\n
<\/div>\n
The\u00a0addAll()<\/em><\/a>\u00a0method is another great option to consider if we want to convert a Queue <\/i>to a List<\/em>.<\/p>\n
As the name implies,\u00a0this method allows adding all elements in the specified collection to the List<\/em><\/strong>.<\/p>\n
Now, let’s see the logic:<\/p>\n
List<String> list = new ArrayList<>();\r\nlist.addAll(queue);<\/code><\/pre>\n
We create a new List<\/em> named list<\/em> and populate it with the elements of the queue<\/em> using the addAll()<\/em> method. The method then returns the resultant list.<\/em><\/p>\n
2.3. Using the LinkedList\u00a0<\/em>Constructor<\/h3>\n
<\/div>\n
The LinkedList<\/em><\/a> constructor provides the most common and easiest way to convert a Queue<\/em> to a LinkedList<\/em>.<\/p>\n
Similar to the above example using the ArrayList<\/em> constructor, we simply pass the Queue<\/em> as a parameter to the\u00a0LinkedList<\/em> constructor<\/strong>:<\/p>\n
LinkedList<String> list = new LinkedList<>(queue);<\/code><\/pre>\n
The constructor new LinkedList<>(queue) <\/em>efficiently converts the queue<\/em> elements into the new LinkedList<\/em>.<\/p>\n
2.4. Using Stream API<\/h3>\n
<\/div>\n
Java 8 comes with a lot of new features that help in enhancing our code. Among these features, we find the Stream API<\/a>.<\/p>\n
Let\u2019s illustrate how to use the stream<\/em> API to convert a Queue<\/em> to a List<\/em>:<\/p>\n
List<String> list = queue.stream().collect(Collectors.toList());<\/code><\/pre>\n
We convert the queue<\/em> to a List<\/em> using the collect(Collectors.toList()) <\/em>operation, which collects the elements of the stream<\/em> into a new list and returns it.<\/strong> This approach leverages a concise and functional programming style with streams to perform the conversion.<\/p>\n
2.5. Using Guava<\/h3>\n
<\/div>\n
Guava<\/a> is a popular open-source library developed by Google that provides a wide range of utility classes and methods to simplify common programming tasks in Java.<\/p>\n
Let’s use Guava to convert Queue<\/em> to List<\/em>:<\/p>\n
List<String> list = Lists.newArrayList(queue);<\/code><\/pre>\n
Guava’s utility method Lists.newArrayList(queue)<\/em> simplifies the process of creating a new list from the elements of a queue.<\/strong><\/p>\n
3. Conclusion<\/h2>\n
<\/div>\n
In this article, we saw various ways to convert Queue<\/em> to List<\/em> in Java. Whether we prefer the simplicity of LinkedList<\/em>, the versatility of ArrayList<\/em>, the elegance of Java 8 streams, or the power of Guava, understanding these techniques empowers us to handle data seamlessly in our Java projects. We can experiment with these approaches to find the one best suited to our requirements and coding style.<\/p>\n
The source code of all these examples is available over on GitHub<\/a>.<\/p>\n
\"\"<\/p>\n
<\/a> <\/a> <\/a> <\/a> <\/a> <\/a> <\/a> <\/div>\n","protected":false},"excerpt":{"rendered":"
\"Contact<\/p>\n
Learn various ways to convert Queue to List in Java.<\/p>\n
<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/div>\n","protected":false},"author":2098,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[22],"tags":[61,122,127,129,124,128,125,132,131,133,126,130,123,66,94,88,97,56,64,65,60,112,40,75,95,104,33,120,105,101,98,115,30,29,41,86,70,69,68,72,71,26,118,108,87,46,55,48,52,54,51,50,83,62,58,57,29691,109,35,59,63,85,79,82,96,80,27,81,114,44,42,43,45,38,39,110,117,100,111,116,73,89,90,92,91,93,84,78,37,102,34,36,77,67,74,99,113,119,28,121,32,47,49,53,103,31,76],"class_list":["post-121191","post","type-post","status-publish","format-standard","hentry","category-mobile","tag-airpods","tag-anime","tag-anime-characters","tag-anime-cosplay","tag-anime-edits","tag-anime-merchandise","tag-anime-movies","tag-anime-news","tag-anime-recommendations","tag-anime-reviews","tag-anime-series","tag-anime-streaming","tag-animes","tag-app-store","tag-app-store-samsung","tag-appgallery","tag-appgallery-oneplus","tag-apple","tag-apple-music","tag-apple-tv","tag-apple-watch","tag-bbc-sport","tag-best-mobile-games","tag-bixby","tag-bixby-xiaomi","tag-champions-league","tag-cyberpunk","tag-cyberpunk-2077","tag-fantasy-football","tag-fifa","tag-football","tag-formula-1","tag-fortnite","tag-free-fire","tag-free-mobile-games","tag-freebuds-pro","tag-galaxy-a52","tag-galaxy-note-20","tag-galaxy-s21","tag-galaxy-watch-4","tag-galaxy-z-fold-3","tag-game","tag-games","tag-golf","tag-harmonyos","tag-how-to-backup-iphone","tag-how-to-factory-reset-iphone","tag-how-to-reset-iphone","tag-how-to-restore-iphone","tag-how-to-unlock-iphone","tag-how-to-unlock-iphone-5","tag-how-to-unlock-iphone-6","tag-huawei","tag-ios","tag-ipad","tag-iphone","tag-java-queue","tag-live-soccer","tag-lol","tag-macbook","tag-macos","tag-mate-40-pro","tag-mi-11-lite","tag-mi-home-security-camera-basic-1080p","tag-mi-home-security-camera-basic-1080p-huawei","tag-mi-smart-band-6","tag-minecraft","tag-miui","tag-mlb-scores","tag-mobile-game-design","tag-mobile-game-development","tag-mobile-game-marketing","tag-mobile-game-monetization","tag-mobile-games","tag-mobile-gaming","tag-nba-scores","tag-nba-standings","tag-nfl","tag-nfl-scores","tag-nhl-scores","tag-one-ui","tag-oneplus","tag-oneplus-9-pro","tag-oneplus-buds-pro","tag-oneplus-nord-ce-5g","tag-oxygenos","tag-p40-pro-plus","tag-poco-x3-pro","tag-pokemon","tag-premier-league","tag-pubg","tag-pubg-mobile","tag-redmi-note-10-pro","tag-samsung","tag-samsung-pay","tag-soccer","tag-sports","tag-steam","tag-steeam","tag-top-10-anime","tag-valorant","tag-when-do-the-iphone-7-come-out","tag-when-does-the-iphone-7-come-out","tag-when-is-the-iphone-7-coming-out","tag-world-cup","tag-xbox-series-x","tag-xiaomi"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/posts\/121191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/users\/2098"}],"replies":[{"embeddable":true,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/comments?post=121191"}],"version-history":[{"count":1,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/posts\/121191\/revisions"}],"predecessor-version":[{"id":121221,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/posts\/121191\/revisions\/121221"}],"wp:attachment":[{"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/media?parent=121191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/categories?post=121191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gamefootballmobileanimeiphone.com\/index.php\/wp-json\/wp\/v2\/tags?post=121191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}