{"id":3899,"date":"2021-08-17T12:47:34","date_gmt":"2021-08-17T12:47:34","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=3899"},"modified":"2022-12-13T11:46:46","modified_gmt":"2022-12-13T11:46:46","slug":"c","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/c\/","title":{"rendered":"LinkedList removeFirst method in Java"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/prepbytes-misc-images.s3.ap-south-1.amazonaws.com\/assets\/1644916098664-linkedlist%20removefirst_Artboard%206.png\" alt=\"\" \/><\/p>\n<h3>Introduction<\/h3>\n<p>The linked list is one of the most important data structures to learn while preparing for interviews. Having a good grasp of Linked Lists can be a huge plus point in a coding interview.<\/p>\n<\/p>\n<h3>Problem Statement<\/h3>\n<p>The LinkedList <strong>removeFirst()<\/strong> method is an important concept when it comes to Linked List problems. This method removes the head of the linked list and also returns it after removing it.<\/p>\n<h3>Problem Statement Understanding<\/h3>\n<p>Let&#8217;s try to understand this <strong>removeFirst()<\/strong> method with help of an example.<\/p>\n<p>Suppose the given list is:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/prepbytes.com\/blog\/wp-content\/uploads\/2021\/08\/given-list.png\" alt=\"\" \/><\/p>\n<p>When we use the removeFirst() method, this method returns the head of the linked list. After returning the head, this method deletes it from the list. <\/p>\n<p>So, on applying the above operations on the given list, we will get:<\/p>\n<ul>\n<li><strong>Coding<\/strong> in output, as it is the head of the linked list, and the final linked list will now be:<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/prepbytes.com\/blog\/wp-content\/uploads\/2021\/08\/final-linked-list.png\" alt=\"\" \/><\/p>\n<p><strong>Input:<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/prepbytes.com\/blog\/wp-content\/uploads\/2021\/08\/given-list.png\" alt=\"\" \/><\/p>\n<p><strong>Output:<\/strong> Coding<\/p>\n<p><strong>Explanation:<\/strong> As we can see, the first element (Coding) is printed.<\/p>\n<p>This concept is not a very complex one. We have to just use the <strong>removeFirst()<\/strong> method on the given linked list whenever we want to remove the head from the linked list. Let us have a glance at the approach and algorithm.<\/p>\n<h3>Approach and Algorithm<\/h3>\n<p>The approach is going to be pretty simple. We will create a new LinkedList and add elements to it. Then, we will just use the list.removeFirst(), it will return the head of the linked list and will also delete it from the linked list. Now, we can simply use the content of head returned by removeFirst() method.<\/p>\n<h3>Dry Run<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/prepbytes.com\/blog\/wp-content\/uploads\/2021\/08\/LinkedList-removeFirst-method-in-Java.png\" alt=\"\" \/><\/p>\n<h3>Code Implementation<\/h3>\n\t\t\t\t\t\t<style>\r\n\t\t\t\t\r\n\t\t\t\t\t#tab_container_3901 {\r\n\toverflow:hidden;\r\n\tdisplay:block;\r\n\twidth:100%;\r\n\tborder:0px solid #ddd;\r\n\tmargin-bottom:30px;\r\n\t}\r\n\r\n#tab_container_3901 .tab-content{\r\n\tpadding:20px;\r\n\tborder: 1px solid #e6e6e6 !important;\r\n\tmargin-top: 0px;\r\n\tbackground-color:#ffffff !important;\r\n\tcolor: #000000 !important;\r\n\tfont-size:16px !important;\r\n\tfont-family: Open Sans !important;\r\n\t\r\n\t\tborder: 1px solid #e6e6e6 !important;\r\n\t}\r\n#tab_container_3901 .wpsm_nav-tabs {\r\n    border-bottom: 0px solid #ddd;\r\n}\r\n#tab_container_3901 .wpsm_nav-tabs > li.active > a, #tab_container_3901 .wpsm_nav-tabs > li.active > a:hover, #tab_container_3901 .wpsm_nav-tabs > li.active > a:focus {\r\n\tcolor: #000000 !important;\r\n\tcursor: default;\r\n\tbackground-color: #ffffff !important;\r\n\tborder: 1px solid #e6e6e6 !important;\r\n}\r\n\r\n#tab_container_3901 .wpsm_nav-tabs > li > a {\r\n    margin-right: 0px !important; \r\n    line-height: 1.42857143 !important;\r\n    border: 1px solid #d5d5d5 !important;\r\n    border-radius: 0px 0px 0 0 !important; \r\n\tbackground-color: #e8e8e8 !important;\r\n\tcolor: #000000 !important;\r\n\tpadding: 15px 18px 15px 18px !important;\r\n\ttext-decoration: none !important;\r\n\tfont-size: 14px !important;\r\n\ttext-align:center !important;\r\n\tfont-family: Open Sans !important;\r\n}\r\n#tab_container_3901 .wpsm_nav-tabs > li > a:focus {\r\noutline: 0px !important;\r\n}\r\n\r\n#tab_container_3901 .wpsm_nav-tabs > li > a:before {\r\n\tdisplay:none !important;\r\n}\r\n#tab_container_3901 .wpsm_nav-tabs > li > a:after {\r\n\tdisplay:none !important ;\r\n}\r\n#tab_container_3901 .wpsm_nav-tabs > li{\r\npadding:0px !important ;\r\nmargin:0px;\r\n}\r\n\r\n#tab_container_3901 .wpsm_nav-tabs > li > a:hover , #tab_container_3901 .wpsm_nav-tabs > li > a:focus {\r\n    color: #000000 !important;\r\n    background-color: #e8e8e8 !important;\r\n\tborder: 1px solid #d5d5d5 !important;\r\n\t\r\n}\r\n#tab_container_3901 .wpsm_nav-tabs > li > a .fa{\r\n\r\nmargin-right:5px !important;\r\n\r\nmargin-left:5px !important;\r\n\r\n\r\n}\r\n\r\n\t\t#tab_container_3901 .wpsm_nav-tabs a{\r\n\t\t\tbackground-image: none;\r\n\t\t\tbackground-position: 0 0;\r\n\t\t\tbackground-repeat: repeat-x;\r\n\t\t}\r\n\t\t\t\r\n\r\n\r\n#tab_container_3901 .wpsm_nav-tabs > li {\r\n    float: left;\r\n    margin-bottom: -1px !important;\r\n\tmargin-right:0px !important; \r\n}\r\n\r\n\r\n#tab_container_3901 .tab-content{\r\noverflow:hidden !important;\r\n}\r\n\r\n\r\n@media (min-width: 769px) {\r\n\r\n\t#tab_container_3901 .wpsm_nav-tabs > li{\r\n\t\tfloat:left !important ;\r\n\t\t\t\tmargin-right:-1px !important;\r\n\t\t\t\t\t}\r\n\t#tab_container_3901 .wpsm_nav-tabs{\r\n\t\tfloat:none !important;\r\n\t\tmargin:0px !important;\r\n\t}\r\n\r\n\t#tab_container_3901 .wpsm_nav-tabs > li {\r\n\t\t\t\t\r\n\t}\r\n\t#tab_container_3901 .wpsm_nav{\r\n\t\t\t}\r\n\r\n}\r\n\r\n\r\n\r\n@media (max-width: 768px) {\r\n\t#tab_container_3901 .wpsm_nav-tabs > li {\r\n\t\t\t\t\r\n\t}\r\n\t#tab_container_3901 .wpsm_nav{\r\n\t\t\t}\r\n}\r\n\r\n\r\n\t.wpsm_nav-tabs li:before{\r\n\t\tdisplay:none !important;\r\n\t}\r\n\r\n\t@media (max-width: 768px) {\r\n\t\t\t\t\r\n\t\t\t\t.wpsm_nav-tabs{\r\n\t\t\tmargin-left:0px !important;\r\n\t\t\tmargin-right:0px !important; \r\n\t\t\t\r\n\t\t}\r\n\t\t\t\t#tab_container_3901 .wpsm_nav-tabs > li{\r\n\t\t\tfloat:none !important;\r\n\t\t}\r\n\t\t\t\r\n\t}\t\t\t\t<\/style>\r\n\t\t\t\t<div id=\"tab_container_3901\" >\r\n\t \r\n\t\t\t\t\t<ul class=\"wpsm_nav wpsm_nav-tabs\" role=\"tablist\" id=\"myTab_3901\">\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t<li role=\"presentation\"  class=\"active\"  onclick=\"do_resize()\">\r\n\t\t\t\t\t\t\t\t<a href=\"#tabs_desc_3901_1\" aria-controls=\"tabs_desc_3901_1\" role=\"tab\" data-toggle=\"tab\">\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"fa fa-code\"><\/i> \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t<span>Java<\/span>\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t<\/a>\r\n\t\t\t\t\t\t\t<\/li>\r\n\t\t\t\t\t\t\t\t\t\t\t <\/ul>\r\n\r\n\t\t\t\t\t  <!-- Tab panes -->\r\n\t\t\t\t\t  <div class=\"tab-content\" id=\"tab-content_3901\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t <div role=\"tabpanel\" class=\"tab-pane  in active \" id=\"tabs_desc_3901_1\">\r\n\t\t\t\t\t\t\t\t<!-- wp:enlighter\/codeblock {\"language\":\"java\"} -->\r\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\r\nimport java.io.*;\r\nimport java.util.LinkedList;\r\n\r\npublic class LinkedListDemo {\r\n    public static void main(String args[])\r\n    {\r\n\r\n        LinkedList&lt;string&gt; list = new LinkedList&lt;string&gt;();\r\n\r\n        list.add(&quot;Coding&quot;);\r\n        list.add(&quot;is&quot;);\r\n        list.add(&quot;fun&quot;);\r\n\r\n\r\n        System.out.println(&quot;LinkedList:&quot; + list);\r\n\r\n        System.out.println(&quot;The first element is: &quot; + list.removeFirst());\r\n\r\n        System.out.println(&quot;Final LinkedList:&quot; + list);\r\n    }\r\n}\r\n\r\n<\/pre>\r\n<!-- \/wp:enlighter\/codeblock -->\t\t\t\t\t\t <\/div>\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t <\/div>\r\n\t\t\t\t\t \r\n\t\t\t\t <\/div>\r\n <script>\r\n\t\tjQuery(function () {\r\n\t\t\tjQuery('#myTab_3901 a:first').tab('show')\r\n\t\t});\r\n\t\t\r\n\t\t\t\tjQuery(function(){\r\n\t\t\tvar b=\"fadeIn\";\r\n\t\t\tvar c;\r\n\t\t\tvar a;\r\n\t\t\td(jQuery(\"#myTab_3901 a\"),jQuery(\"#tab-content_3901\"));function d(e,f,g){\r\n\t\t\t\te.click(function(i){\r\n\t\t\t\t\ti.preventDefault();\r\n\t\t\t\t\tjQuery(this).tab(\"show\");\r\n\t\t\t\t\tvar h=jQuery(this).data(\"easein\");\r\n\t\t\t\t\tif(c){c.removeClass(a);}\r\n\t\t\t\t\tif(h){f.find(\"div.active\").addClass(\"animated \"+h);a=h;}\r\n\t\t\t\t\telse{if(g){f.find(\"div.active\").addClass(\"animated \"+g);a=g;}else{f.find(\"div.active\").addClass(\"animated \"+b);a=b;}}c=f.find(\"div.active\");\r\n\t\t\t\t});\r\n\t\t\t}\r\n\t\t});\r\n\t\t\r\n\r\n\t\tfunction do_resize(){\r\n\r\n\t\t\tvar width=jQuery( '.tab-content .tab-pane iframe' ).width();\r\n\t\t\tvar height=jQuery( '.tab-content .tab-pane iframe' ).height();\r\n\r\n\t\t\tvar toggleSize = true;\r\n\t\t\tjQuery('iframe').animate({\r\n\t\t\t    width: toggleSize ? width : 640,\r\n\t\t\t    height: toggleSize ? height : 360\r\n\t\t\t  }, 250);\r\n\r\n\t\t\t  toggleSize = !toggleSize;\r\n\t\t}\r\n\r\n\r\n\t<\/script>\r\n\t\t\t\t\r\n\t\t\t\n<h3>Output<\/h3>\n<p><strong>LinkedList:<\/strong> [Coding, is, Fun]<br \/>\n<strong>The first element is:<\/strong> Coding<br \/>\n<strong>Final LinkedList:<\/strong> [is, Fun]<\/p>\n<p><strong>Time Complexity:<\/strong> O(1), as constant work is being done.<br \/>\n[forminator_quiz id=&#8221;3900&#8243;]<\/p>\n<p>So, in this article, we have tried to explain how to use LinkedList removeFirst() method in Java. If you want to solve more questions on Linked List, which are curated by our expert mentors at PrepBytes, you can follow this link <a href=\"https:\/\/mycode.prepbytes.com\/interview-coding\/practice\/linked-list\">Linked List<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction The linked list is one of the most important data structures to learn while preparing for interviews. Having a good grasp of Linked Lists can be a huge plus point in a coding interview. Problem Statement The LinkedList removeFirst() method is an important concept when it comes to Linked List problems. This method removes [&hellip;]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[125],"tags":[],"class_list":["post-3899","post","type-post","status-publish","format-standard","hentry","category-linked-list"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Learn to implement LinkedList removeFirst method in Java<\/title>\n<meta name=\"description\" content=\"Learn how to use the LinkedList removeFirst() method in Java. 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