{"id":25540670,"date":"2022-09-02T20:00:55","date_gmt":"2022-09-02T14:30:55","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=25540670"},"modified":"2022-11-19T13:28:58","modified_gmt":"2022-11-19T07:58:58","slug":"how-to-use-stacks-in-java-a-study","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/","title":{"rendered":"How to Use Stacks in Java? A Study"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e0c680490b3\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0c680490b3\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#How_to_Create_a_Stack\" >How to Create a Stack?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Populating_a_Stack\" >Populating a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#View_the_Items_in_a_Stack\" >View the Items in a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Searching_for_an_Item_Position_in_a_Stack\" >Searching for an Item Position in a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Updating_Items_in_a_Stack\" >Updating Items in a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Deleting_an_Item_From_a_Stack\" >Deleting an Item From a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Deleting_All_the_Items_in_a_Stack\" >Deleting All the Items in a Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Practical_Applications_for_the_Stack_Data_Structure\" >Practical Applications for the Stack Data Structure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#Methods_in_the_Stack_class\" >Methods in the Stack class<\/a><\/li><\/ul><\/nav><\/div>\n<p>The Stack class in the Java Collection framework models and implements a stack in java data structure. The basic principle of last-in-first-out governs the class. Aside from the basic push and pop operations, the class also includes three additional functions: empty, search, and peek. The class also extends Vector and treats the class as a stack with the <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">functions mentioned<\/a>. The class can also be referred to as a Vector subclass. The Vector class is extended by the stack in java class. It allows you to add new elements to the stack, view existing elements in the stack, update existing elements in the stack, and delete all elements from the stack. Data is processed in a first-in-last-out (FILO) order by stacks. This means that you can only add or remove items from the stack&#8217;s top. The Java Stack class, on the other hand, has access to over 40 other methods that it inherits from the Vector class.<\/p>\n<h2><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-25531373 size-full\" src=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/07\/Python-and-Machine-Learning-Rectangle-1.png\" alt=\"\" width=\"970\" height=\"250\" srcset=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/07\/Python-and-Machine-Learning-Rectangle-1.png 970w, https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/07\/Python-and-Machine-Learning-Rectangle-1-300x77.png 300w, https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/07\/Python-and-Machine-Learning-Rectangle-1-768x198.png 768w, https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/07\/Python-and-Machine-Learning-Rectangle-1-750x193.png 750w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><\/a><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Create_a_Stack\"><\/span><strong>How to Create a Stack?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To make a stack in java, import the java.util.stack <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">package and<\/a> use the Stack() function Object() { [native code] } of this class. The example below creates an empty Stack.<\/p>\n<blockquote><p>Stack&lt;E&gt; stack = new Stack&lt;E&gt;();<\/p><\/blockquote>\n<p>Here E is the type of Object.<\/p>\n<p><strong>Example:\u00a0<\/strong><\/p>\n<div class=\"responsive-tabs-wrapper\">\n<div class=\"responsive-tabs responsive-tabs--enabled\">\n<ul class=\"responsive-tabs__list\" role=\"tablist\">\n<li id=\"tablist1-tab1\" class=\"responsive-tabs__list__item responsive-tabs__list__item--active\" role=\"tab\">Java<\/li>\n<\/ul>\n<div id=\"tablist1-panel1\" class=\"tabcontent responsive-tabs__panel responsive-tabs__panel--active\" role=\"tabpanel\" aria-hidden=\"false\" aria-labelledby=\"tablist1-tab1\">\n<div class=\"code-block\">\n<div class=\"code-gutter\">\n<div class=\"editor-buttons-container\">\n<div class=\"editor-buttons\"><\/div>\n<\/div>\n<\/div>\n<div class=\"code-container\">\n<div id=\"highlighter_79659\" class=\"syntaxhighlighter nogutter\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"comments\">\/\/ Java code for stack implementation<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"keyword\">import<\/code> <code class=\"plain\">java.io.*;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"keyword\">import<\/code> <code class=\"plain\">java.util.*;<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"keyword\">class<\/code> <code class=\"plain\">Test<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"plain\">{\u00a0\u00a0\u00a0<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"comments\">\/\/ Pushing element on the top of the stack<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">static<\/code> <code class=\"keyword\">void<\/code> <code class=\"plain\">stack_push(Stack&lt;Integer&gt; stack)<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">for<\/code><code class=\"plain\">(<\/code><code class=\"keyword\">int<\/code> <code class=\"plain\">i = <\/code><code class=\"value\">0<\/code><code class=\"plain\">; i &lt; <\/code><code class=\"value\">5<\/code><code class=\"plain\">; i++)<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack.push(i);<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"comments\">\/\/ Popping element from the top of the stack<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">static<\/code> <code class=\"keyword\">void<\/code> <code class=\"plain\">stack_pop(Stack&lt;Integer&gt; stack)<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">System.out.println(<\/code><code class=\"string\">\"Pop Operation:\"<\/code><code class=\"plain\">);<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">for<\/code><code class=\"plain\">(<\/code><code class=\"keyword\">int<\/code> <code class=\"plain\">i = <\/code><code class=\"value\">0<\/code><code class=\"plain\">; i &lt; <\/code><code class=\"value\">5<\/code><code class=\"plain\">; i++)<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">Integer y = (Integer) stack.pop();<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">System.out.println(y);<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"comments\">\/\/ Displaying element on the top of the stack<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">static<\/code> <code class=\"keyword\">void<\/code> <code class=\"plain\">stack_peek(Stack&lt;Integer&gt; stack)<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">Integer element = (Integer) stack.peek();<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">System.out.println(<\/code><code class=\"string\">\"Element on stack top: \"<\/code> <code class=\"plain\">+ element);<\/code><\/div>\n<div class=\"line number34 index33 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number35 index34 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n<div class=\"line number36 index35 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"comments\">\/\/ Searching element in the stack<\/code><\/div>\n<div class=\"line number37 index36 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">static<\/code> <code class=\"keyword\">void<\/code> <code class=\"plain\">stack_search(Stack&lt;Integer&gt; stack, <\/code><code class=\"keyword\">int<\/code> <code class=\"plain\">element)<\/code><\/div>\n<div class=\"line number38 index37 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number39 index38 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">Integer pos = (Integer) stack.search(element);<\/code><\/div>\n<div class=\"line number40 index39 alt1\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number41 index40 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">if<\/code><code class=\"plain\">(pos == -<\/code><code class=\"value\">1<\/code><code class=\"plain\">)<\/code><\/div>\n<div class=\"line number42 index41 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">System.out.println(<\/code><code class=\"string\">\"Element not found\"<\/code><code class=\"plain\">);<\/code><\/div>\n<div class=\"line number43 index42 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">else<\/code><\/div>\n<div class=\"line number44 index43 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">System.out.println(<\/code><code class=\"string\">\"Element is found at position: \"<\/code> <code class=\"plain\">+ pos);<\/code><\/div>\n<div class=\"line number45 index44 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number46 index45 alt1\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number47 index46 alt2\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number48 index47 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"keyword\">public<\/code> <code class=\"keyword\">static<\/code> <code class=\"keyword\">void<\/code> <code class=\"plain\">main (String[] args)<\/code><\/div>\n<div class=\"line number49 index48 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">{<\/code><\/div>\n<div class=\"line number50 index49 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">Stack&lt;Integer&gt; stack = <\/code><code class=\"keyword\">new<\/code> <code class=\"plain\">Stack&lt;Integer&gt;();<\/code><\/div>\n<div class=\"line number51 index50 alt2\"><code class=\"undefined spaces\">\u00a0<\/code><\/div>\n<div class=\"line number52 index51 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_push(stack);<\/code><\/div>\n<div class=\"line number53 index52 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_pop(stack);<\/code><\/div>\n<div class=\"line number54 index53 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_push(stack);<\/code><\/div>\n<div class=\"line number55 index54 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_peek(stack);<\/code><\/div>\n<div class=\"line number56 index55 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_search(stack, <\/code><code class=\"value\">2<\/code><code class=\"plain\">);<\/code><\/div>\n<div class=\"line number57 index56 alt2\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">stack_search(stack, <\/code><code class=\"value\">6<\/code><code class=\"plain\">);<\/code><\/div>\n<div class=\"line number58 index57 alt1\"><code class=\"undefined spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"plain\">}<\/code><\/div>\n<div class=\"line number59 index58 alt2\"><code class=\"plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>Output:<\/strong><\/p>\n<pre>Pop Operation:\r\n4\r\n3\r\n2\r\n1\r\n0\r\nElement on stack top: 4\r\nElement is found at position: 3\r\nElement not found<\/pre>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/bit.ly\/3ELmCiA\" target=\"_blank\" rel=\"noopener\">Learn Coding in your Language! Enroll Here!<\/a><\/strong><\/p>\n<h2 id=\"populating-a-stack\"><span class=\"ez-toc-section\" id=\"Populating_a_Stack\"><\/span><strong>Populating a Stack<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The push() method is one of the Stack class&#8217;s five primary methods. It <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">pushes a<\/a> single item that has the same data type as the stack implementation in java to the top of the Stack.<\/p>\n<p><span class=\"hljs-comment\">\/\/ populate a stack<\/span><br \/>\nCustomers.push(&#8220;Jane Doe&#8221;);<br \/>\nCustomers.push(&#8220;John Doe&#8221;);<br \/>\nCustomers.push(&#8220;Patrick Williams&#8221;);<br \/>\nCustomers.push(&#8220;Paul Smith&#8221;);<br \/>\nCustomers.push(&#8220;Erick Rowe&#8221;);<br \/>\nCustomers.push(&#8220;Ella Jones&#8221;);<br \/>\nCustomers.push(&#8220;Jessica Brown&#8221;);<\/p>\n<p>The code above adds seven items to the Customers&#8217; stack implementation in java. Each new item is pushed to the top of the Stack. So Jessica Brown is at the top of the Customers Stack. You can also confirm this with the Stack peek() method. The peek() method does not accept any arguments. It returns the topmost object in the Stack without removing it.<\/p>\n<p><span class=\"hljs-comment\">\/\/ view object at the top of a stack<\/span><br \/>\nSystem.out.println(Customers.peek());<\/p>\n<p>The code above returns the following output to the console:<\/p>\n<pre><code class=\"hljs \">Jessica Brown\r\n<\/code><\/pre>\n<h2 id=\"view-the-items-in-a-stack\"><span class=\"ez-toc-section\" id=\"View_the_Items_in_a_Stack\"><\/span><strong>View the Items in a Stack<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The stack data structure is quite limited in how you can interact with its data. You should primarily use a Stack through its topmost item. However, you can access arbitrary elements by using <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">methods inherited<\/a> from the Vector class. element and remove elemental are two examples.<\/p>\n<p>Printing a Stack&#8217;s contents is the simplest way to get an overview of its contents. System.out expects a Stack object. A nice summary will be produced by println and the Stack&#8217;s function toString() { [native code] }() method:<\/p>\n<pre><code class=\"hljs java\"><span class=\"hljs-comment\">\/\/ view all elements of a stack<\/span>\r\nSystem.out.println(Customers);<\/code><\/pre>\n<p>The code above prints the following output to the console:<\/p>\n<pre><code class=\"hljs css\"><span class=\"hljs-selector-attr\">[Jane Doe, John Doe, Patrick Williams, Paul Smith, Erick Rowe, Ella Jones, Jessica Brown]<\/span><\/code><\/pre>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/bit.ly\/3ELmCiA\" target=\"_blank\" rel=\"noopener\">Power up your career with Entri Elevate &#8211; Full Stack Development Course!<\/a><\/strong><\/p>\n<h2 id=\"searching-for-an-item-position-in-a-stack\"><span class=\"ez-toc-section\" id=\"Searching_for_an_Item_Position_in_a_Stack\"><\/span><strong>Searching for an Item Position in a Stack<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If you know the index position of an item in the Stack, you can determine its <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">position relative<\/a> to the top of the Stack. The indexOf() method returns the index position of an item in the stack implementation in java. Keep in mind that a Stack begins indexing its items at zero.<\/p>\n<pre><code class=\"hljs java\"><span class=\"hljs-comment\">\/\/ find an item index position<\/span>\r\nSystem.out.println(Customers.indexOf(\"Jane Doe\"));<\/code><\/pre>\n<p>The code above prints the following output to the console:<\/p>\n<pre><code class=\"hljs \">0<\/code><\/pre>\n<p><code class=\"hljs \"><\/code>The search() method is one of the most important methods in the Stack class. It returns an item position relative to the top of the stack, with the top item having position number one.<\/p>\n<pre><code class=\"hljs java\">System.out.println(Customers.search(\"Jane Doe\"));<\/code><\/pre>\n<p>The code above prints the following output to the console:<\/p>\n<pre><code class=\"hljs \">7<\/code><\/pre>\n<p>If you supply the\u00a0<strong>search()\u00a0<\/strong>or the\u00a0<strong>indexOf()<\/strong>\u00a0methods with an item that is not in the Stack, they will return a negative one.<\/p>\n<pre><code class=\"hljs java\">System.out.println(Customers.search(\"Elsa Doe\"));\r\nSystem.out.println(Customers.indexOf(\"Elsa Doe\"));<\/code><\/pre>\n<p>The code above prints the following output to the console:<\/p>\n<pre><code class=\"hljs \">-1\r\n-1<\/code><\/pre>\n<h2 id=\"updating-items-in-a-stack\"><span class=\"ez-toc-section\" id=\"Updating_Items_in_a_Stack\"><\/span><strong>Updating Items in a Stack<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Only items at the top of a Stack can be manipulated. If you want to <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">update an<\/a> element that is not at the top of the Stack, you must pop everything above it. One of the most important methods of the Stack is pop(). The pop() method does not accept any arguments. It removes and returns the item at the top of the stack.<\/p>\n<pre><code class=\"hljs java\"><span class=\"hljs-comment\">\/\/ update an object<\/span>\r\nCustomers.pop();\r\nCustomers.pop();\r\nCustomers.push(\"Ella James\");\r\nCustomers.push(\"Jessica Brown\");\r\nSystem.out.println(Customers);<\/code><\/pre>\n<p>The code above prints the following output to the console:<\/p>\n<p><code class=\"hljs css\"><span class=\"hljs-selector-attr\">[Jane Doe, John Doe, Patrick Williams, Paul Smith, Erick Rowe, Ella James, Jessica Brown]<\/span><\/code><\/p>\n<p>As the output shows, the code changes Ella&#8217;s surname to James. It entails <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">a process<\/a> of popping items from the stack until you reach the target object. It then pops the target object, updates it, and returns it to the stack, along with the items that were on top of it. Each time you want to update an item in your Stack, you must use a program that performs operations like the one described above.<\/p>\n<h2 id=\"deleting-an-item-from-a-stack\"><span class=\"ez-toc-section\" id=\"Deleting_an_Item_From_a_Stack\"><\/span>Deleting an Item From a Stack<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To remove a single item from the Stack data structure, use the pop() method once more. If the item you want to delete is not at the top, you can pop up items until you find it.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/bit.ly\/3ELmCiA\" target=\"_blank\" rel=\"noopener\">Power up your career with Entri Elevate &#8211; Full Stack Development Course!<\/a><\/strong><\/p>\n<h2 id=\"deleting-all-the-items-in-a-stack\"><span class=\"ez-toc-section\" id=\"Deleting_All_the_Items_in_a_Stack\"><\/span>Deleting All the Items in a Stack<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>You can use a Java while loop with the pop() method to delete all <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">the elements<\/a> from a Stack one at a time. However, using the clear() method is a more efficient approach. The clear() method is inherited by the Stack class from the Vector class. It accepts no arguments and returns nothing; it simply removes all elements from the Stack data structure.<\/p>\n<p><span class=\"hljs-comment\">\/\/ delete all items in a stack<\/span><br \/>\nCustomers.clear();<br \/>\nSystem.out.println(Customers.empty());<\/p>\n<p>The preceding code removes all items from the Customers Stack. The empty() method is then used to determine whether the Stack is empty. Another primary method of the Java Stack Class is empty(). It does not accept any arguments and returns a Boolean value. If the Stack is empty, this method returns true; otherwise, it returns false.<\/p>\n<p>The code above prints the following output to the console:<\/p>\n<pre><code class=\"hljs javascript\"><span class=\"hljs-literal\">true<\/span><\/code><\/pre>\n<h2 id=\"practical-applications-for-the-stack-data-structure\"><span class=\"ez-toc-section\" id=\"Practical_Applications_for_the_Stack_Data_Structure\"><\/span>Practical Applications for the Stack Data Structure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Stack data structure is extremely limited. It does not offer as much <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">data processing<\/a> flexibility as other data structures. This begs the question, when should the Stack data structure be used?<\/p>\n<p>The Stack data structure is ideal for applications that require reverse data processing. These are some examples:<\/p>\n<p>A program that determines whether a word is a palindrome.<br \/>\nA program for converting decimal numbers to binary numbers.<br \/>\nApplications that allow users to undo previous actions.<br \/>\nGames that allow the user to return to previous moves, such as chess.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/bit.ly\/3ELmCiA\">Learn Coding in your Language! Enroll Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Methods_in_the_Stack_class\"><\/span>Methods in the Stack class<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>push():<\/p>\n<p>The push() method moves an element passed as <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">a parameter<\/a> to the top of the stack.<\/p>\n<p>pop():<\/p>\n<p>The pop() method removes and returns the stack&#8217;s top element.<\/p>\n<p>If we call the pop() method on an empty stack, an EmptyStackException exception is thrown.<\/p>\n<p>peek():<\/p>\n<p>The peek() method returns the topmost element of the stack without removing it.<\/p>\n<p>empty():<\/p>\n<p>If the stack is empty, the empty() method returns true; otherwise, it returns false.<\/p>\n<p>Object element search:<\/p>\n<p>The search() method determines whether an object, which is the input parameter of the function, exists in the stack or not.<\/p>\n<p>If the element is found, it returns the position (as an integer) of the element from the top of the stack otherwise.<\/p>\n<div>\n<div>Example<\/div>\n<div>import java.util.*; \/\/importing the stack class<\/div>\n<div>class MyClass{<\/div>\n<div>\u00a0 publicstaticvoid main (String[] args)<\/div>\n<div>\u00a0 {<\/div>\n<div>\u00a0 \u00a0 \/\/ Creating a Stack<\/div>\n<div>\u00a0 \u00a0 Stack&lt;Integer&gt; even = new Stack&lt;&gt;();<\/div>\n<div>\u00a0 \u00a0 \/\/ pushing values in stack<\/div>\n<div>\u00a0 \u00a0 even.push(0);<\/div>\n<div>\u00a0 \u00a0 even.push(2);<\/div>\n<div>\u00a0 \u00a0 even.push(4);<\/div>\n<div>\u00a0 \u00a0 even.push(6);<\/div>\n<div>\u00a0 \u00a0 even.push(8);<\/div>\n<div>\u00a0 \u00a0 even.push(10);<\/div>\n<div>\u00a0 \u00a0 even.push(12);<\/div>\n<div>\u00a0 \u00a0 even.push(14);<\/div>\n<div>\u00a0 \u00a0 even.push(16);<\/div>\n<div>\u00a0 \u00a0 \/\/printing the stack<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Print Stack before pop:&#8221;);<\/div>\n<div>\u00a0 \u00a0 System.out.println(even);<\/div>\n<div>\u00a0 \u00a0 \/\/ returning the number at the top of the stack and removing it<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;pop =&gt; &#8221; + even.pop());<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;pop =&gt; &#8221; + even.pop());<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;pop =&gt; &#8221; + even.pop());<\/div>\n<div>\u00a0 \u00a0 \/\/printing the stack<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Print Stack after pop:&#8221;);<\/div>\n<div>\u00a0 \u00a0 System.out.println(even);<\/div>\n<div>\u00a0 \u00a0 \/\/ accessing the number at the top of the stack but not removing it<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Number on top of the stack is =&gt; &#8221; + even.peek());<\/div>\n<div>\u00a0 \u00a0 \/\/ checking if the stack is empty or not<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Is stack empty? \u00a0Ans:&#8221; + even.empty());<\/div>\n<div>\u00a0 \u00a0 \/\/ checking the position of 8 in the stack<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Position of 8 from the top is &#8221; + even.search(8));<\/div>\n<div>\u00a0 \u00a0 \/\/ check if 20 exists in the stack<\/div>\n<div>\u00a0 \u00a0 System.out.println(&#8220;Position of 20 from the top is &#8221; + even.search(20));<\/div>\n<div>\u00a0 }<\/div>\n<\/div>\n<p>If you are interested to learn new coding skills, the Entri app will help you to <a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\">acquire them<\/a> very easily. Entri app is following a structural study plan so that the students can learn very easily. If you don&#8217;t have a coding background, it won&#8217;t be a problem. You can download the Entri app from the google play store and enroll in your favorite course.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/bit.ly\/3ELmCiA\">Learn Coding in your Language! Enroll Here!<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Stack class in the Java Collection framework models and implements a stack in java data structure. The basic principle of last-in-first-out governs the class. Aside from the basic push and pop operations, the class also includes three additional functions: empty, search, and peek. The class also extends Vector and treats the class as a [&hellip;]<\/p>\n","protected":false},"author":93,"featured_media":25540676,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,1864,1882,1883,1881],"tags":[],"class_list":["post-25540670","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-data-science-ml","category-java-programming","category-react-native","category-web-android-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Use Stacks in Java? 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The class also extends Vector and treats the class as a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/\" \/>\n<meta property=\"og:site_name\" content=\"Entri Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/entri.me\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-02T14:30:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-19T07:58:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2022\/09\/Untitled-2022-09-02T160618.250-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"820\" \/>\n\t<meta property=\"og:image:height\" content=\"615\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Akhil M G\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@entri_app\" \/>\n<meta name=\"twitter:site\" content=\"@entri_app\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Akhil M G\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/entri.app\/blog\/how-to-use-stacks-in-java-a-study\/\"},\"author\":{\"name\":\"Akhil M G\",\"@id\":\"https:\/\/entri.app\/blog\/#\/schema\/person\/875646423b2cce93c1bd5bc16850fff6\"},\"headline\":\"How to Use Stacks in Java? 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