{"id":656446,"date":"2021-02-08T17:15:33","date_gmt":"2021-02-08T11:45:33","guid":{"rendered":"https:\/\/prepinsta.com\/?page_id=656446"},"modified":"2026-01-14T15:05:19","modified_gmt":"2026-01-14T09:35:19","slug":"representation-of-a-stack-as-an-array","status":"publish","type":"page","link":"https:\/\/prepinsta.com\/java-program\/representation-of-a-stack-as-an-array\/","title":{"rendered":"Representation of a Stack as an Array"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"656446\" class=\"elementor elementor-656446\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d81d188 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d81d188\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-57b77c9\" data-id=\"57b77c9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-6b166f4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6b166f4\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-0a8e17a\" data-id=\"0a8e17a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c09aea5 elementor-widget elementor-widget-heading\" data-id=\"c09aea5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Representation of a Stack as an Array in Java<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6902c39 elementor-widget elementor-widget-text-editor\" data-id=\"6902c39\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #ffffff;\"><strong>Representation of a Stack as an Array in Java<\/strong> is one of the simplest and most commonly taught ways to understand how stacks work internally. <\/span><\/p><p><span style=\"color: #ffffff;\">In this approach, a stack is implemented using a fixed size array along with a variable that keeps track of the top element. This method helps beginners clearly visualize stack operations such as push, pop, and peek while building a strong foundation in data structures and algorithmic thinking.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-2602002\" data-id=\"2602002\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-50620d2 elementor-hidden-tablet elementor-hidden-mobile elementor-widget elementor-widget-image\" data-id=\"50620d2\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"512\" height=\"512\" src=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2026\/01\/Representation-of-a-Stack-as-an-Array-in-Java-Programming.webp\" class=\"attachment-large size-large wp-image-1711291\" alt=\"Representation of a Stack as an Array in Java Programming\" srcset=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2026\/01\/329Ulv8m-Representation-of-a-Stack-as-an-Array-in-Java-Programming-300x300.webp 300w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2026\/01\/329Ulv8m-Representation-of-a-Stack-as-an-Array-in-Java-Programming-150x150.webp 150w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2026\/01\/329Ulv8m-Representation-of-a-Stack-as-an-Array-in-Java-Programming-100x100.webp 100w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2026\/01\/Representation-of-a-Stack-as-an-Array-in-Java-Programming.webp 512w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f4722a4 lineAdder elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f4722a4\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c0c40e3\" data-id=\"c0c40e3\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-2b20108 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2b20108\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-8c424e4\" data-id=\"8c424e4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d995564 elementor-widget elementor-widget-heading\" data-id=\"d995564\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is Stack in Java ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bad14cf elementor-widget elementor-widget-text-editor\" data-id=\"bad14cf\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Stack is a linear data structure that stores elements in a specific order. It follows the Last-In-First-Out (LIFO) principle, the last element added is the first one removed.<\/p><p><span style=\"text-decoration: underline; color: #ff0000;\"><strong>You can think of a stack like a stack of plates:<\/strong><\/span><\/p><ul><li>You push (add) a plate on top, and<\/li><li>You pop (remove) the top plate first.<\/li><\/ul><p><strong>In programming,<\/strong> you use stacks for tasks like reversing data, parsing expressions, and managing function calls.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-46eabbe elementor-widget elementor-widget-heading\" data-id=\"46eabbe\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Representation of a Stack as an Array in Java<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2bbce39 lineAdder elementor-widget elementor-widget-text-editor\" data-id=\"2bbce39\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>An array is used to store an ordered list of elements. Using an array for representation of stack is one of the easy techniques to manage the data. But there is a major difference between an array and a stack.<\/p><div><ul><li>Size of an array is fixed.<\/li><li>While, in a stack, there is no fixed size since the size of stack changed with the number of elements inserted or deleted to and from it.<\/li><\/ul><\/div><h3><strong>Following are common operations implemented on the stack:<\/strong><\/h3><ul><li><strong>push():<\/strong>When we insert an element in a stack then the operation is known as a push. If the stack is full then the condition is called overflow condition.<\/li><li><strong>pop():<\/strong>\u00a0When we want to delete an element from the stack, the operation is known as a pop. If the stack is empty means there is no element in the stack, this condition is known as an underflow state.<\/li><li><strong>isEmpty():<\/strong>When we want to determines whether the stack is empty or not.<\/li><li><strong>isFull():<\/strong>\u00a0when we want to determines whether the stack is full or not.&#8217;<\/li><\/ul><ul><li><strong>peek():<\/strong> It returns the element at the given position.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a68f788 elementor-alert-success elementor-widget elementor-widget-alert\" data-id=\"a68f788\" data-element_type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Fact 1:<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\"><b>Array based stacks are memory efficient:<\/b>\n<br>\nSince arrays store elements in contiguous memory locations, stack operations using arrays are fast and involve minimal overhead compared to linked list implementations.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-159cb05 elementor-widget elementor-widget-heading\" data-id=\"159cb05\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Stack Operations and Logic<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7e3983 lineAdder elementor-widget elementor-widget-text-editor\" data-id=\"d7e3983\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Stack using an array typically supports the following operations:<\/strong><\/p><div class=\"table-grey\"><table class=\"table\"><thead><tr><th>Operation<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>push(x)<\/td><td>Add element x to the top of the stack<\/td><\/tr><tr><td>pop()<\/td><td>Remove and return the element at the top<\/td><\/tr><tr><td>peek()<\/td><td>View the element at the top without removing it<\/td><\/tr><tr><td>isEmpty()<\/td><td>Check if the stack has no elements<\/td><\/tr><tr><td>isFull()<\/td><td>Check if the stack has reached its capacity<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-471a798 elementor-hidden-phone elementor-widget elementor-widget-global elementor-global-1438707 elementor-widget-image\" data-id=\"471a798\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/bit.ly\/dsa-adv\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1238\" height=\"346\" src=\"https:\/\/files.prepinsta.com\/2023\/02\/DSA1.gif\" class=\"elementor-animation-grow attachment-full size-full wp-image-1438705\" alt=\"DSA desktop gif\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d453bec elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-global elementor-global-1438716 elementor-widget-image\" data-id=\"d453bec\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/bit.ly\/dsa-adv\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"540\" height=\"316\" src=\"https:\/\/files.prepinsta.com\/2023\/02\/DSA.gif\" class=\"elementor-animation-grow attachment-full size-full wp-image-1438704\" alt=\"DSA mobile gif\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-cf07beb\" data-id=\"cf07beb\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5d7c3af globalAccord elementor-hidden-phone elementor-widget elementor-widget-accordion\" data-id=\"5d7c3af\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-9801\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-9801\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<a 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data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 style=\"text-align: center;\">Related Banners<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-02789bc elementor-hidden-mobile elementor-widget__width-initial elementor--h-position-center elementor--v-position-middle elementor-pagination-position-inside elementor-widget elementor-widget-global elementor-global-1404653 elementor-widget-slides\" data-id=\"02789bc\" data-element_type=\"widget\" data-settings=\"{&quot;navigation&quot;:&quot;dots&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;autoplay_speed&quot;:5000,&quot;infinite&quot;:&quot;yes&quot;,&quot;transition&quot;:&quot;slide&quot;,&quot;transition_speed&quot;:500}\" data-widget_type=\"slides.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-swiper\">\n\t\t\t\t\t<div class=\"elementor-slides-wrapper elementor-main-swiper swiper\" role=\"region\" aria-roledescription=\"carousel\" aria-label=\"Slides\" dir=\"ltr\" data-animation=\"fadeInUp\">\n\t\t\t\t<div class=\"swiper-wrapper elementor-slides\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-repeater-item-54bd68c swiper-slide\" role=\"group\" aria-roledescription=\"slide\"><div class=\"swiper-slide-bg\" role=\"img\"><\/div><a class=\"swiper-slide-inner\" href=\"http:\/\/bit.ly\/3gzfDjk\"><div class=\"swiper-slide-contents\"><\/div><\/a><\/div><div class=\"elementor-repeater-item-6c1ca64 swiper-slide\" role=\"group\" aria-roledescription=\"slide\"><div class=\"swiper-slide-bg\" role=\"img\"><\/div><a class=\"swiper-slide-inner\" href=\"http:\/\/bit.ly\/3gzfDjk\"><div class=\"swiper-slide-contents\"><\/div><\/a><\/div><div class=\"elementor-repeater-item-bad104c swiper-slide\" role=\"group\" aria-roledescription=\"slide\"><div class=\"swiper-slide-bg\" role=\"img\"><\/div><a class=\"swiper-slide-inner\" href=\"http:\/\/bit.ly\/3gzfDjk\"><div class=\"swiper-slide-contents\"><\/div><\/a><\/div><div class=\"elementor-repeater-item-184f6f8 swiper-slide\" role=\"group\" aria-roledescription=\"slide\"><div class=\"swiper-slide-bg\" role=\"img\"><\/div><a class=\"swiper-slide-inner\" href=\"http:\/\/bit.ly\/3gzfDjk\"><div class=\"swiper-slide-contents\"><\/div><\/a><\/div>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"swiper-pagination\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2cb84b4 elementor-hidden-phone elementor-widget elementor-widget-global elementor-global-1265713 elementor-widget-text-editor\" data-id=\"2cb84b4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\">Get PrepInsta Prime &amp; get Access to all 200+ courses offered by PrepInsta in One Subscription<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c8e0e23 elementor-align-center elementor-hidden-phone elementor-widget elementor-widget-global elementor-global-1265723 elementor-widget-button\" data-id=\"c8e0e23\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg elementor-animation-grow\" href=\"https:\/\/bit.ly\/right-widget-banner\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Get Prime<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-f95a375 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f95a375\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1abb60d\" data-id=\"1abb60d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6504361 elementor-widget elementor-widget-heading\" data-id=\"6504361\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Different Implementation of Stack as an Array<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8fca0db elementor-widget elementor-widget-text-editor\" data-id=\"8fca0db\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Algorithm:<\/h2><h3><span style=\"text-decoration: underline;\">1. Push operation :<\/span>\u00a0<\/h3><ol><li>If <strong>top == capacity &#8211; 1<\/strong>, report Stack Overflow (stack full) and stop.<\/li><li>Otherwise, increment top by 1.<\/li><li>Store the value: <strong>stack[top] = value<\/strong>.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c0517d txtDown elementor-widget elementor-widget-text-editor\" data-id=\"2c0517d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<pre class=\"lscodehighlight\">boolean push (int x)\n  {\n    if (top >= (MAX - 1))\n      {\n\tSystem.out.println (\"Overflow condition reached\");\n\treturn false;\n      }\n    else\n      {\n\ta[++top] = x;\n\tSystem.out.println (x + \" pushed into stack\");\n\treturn true;\n      }\n  }\n<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-867e851 elementor-widget elementor-widget-text-editor\" data-id=\"867e851\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><span style=\"text-decoration: underline;\">2. Pop Operation<\/span>:\u00a0<\/h3><ol><li>If <strong>top == -1<\/strong>, report Stack Underflow (stack empty) and stop.<\/li><li>Otherwise, store <strong>poppedValue = stack[top]<\/strong>.<\/li><li>Decrement top by 1.<\/li><li>Return <strong>poppedValue<\/strong>.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6bfd0e0 txtDown elementor-widget elementor-widget-text-editor\" data-id=\"6bfd0e0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<pre class=\"lscodehighlight\">int pop()\n    {\n        if (top &lt; 0) {\n            System.out.println(\u201cUnderflow condition reached\u201d);\n            return 0;\n        }\n        else {\n            int x = a[top\u2013];\n            return x;\n        }\n    }<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9513ae1 elementor-widget elementor-widget-text-editor\" data-id=\"9513ae1\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><span style=\"text-decoration: underline;\">3. peek operation<\/span>:<\/h3><ol><li>If <strong>top == -1<\/strong>, report stack is empty and stop.<\/li><li>Return <strong>stack[top]<\/strong>.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-00a9c01 txtDown elementor-widget elementor-widget-text-editor\" data-id=\"00a9c01\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<pre class=\"lscodehighlight\">int peek()\n    {\n        if (top &lt; 0) {\n            System.out.println(\u201cUnderflow condition\u201d);\n            return 0;\n        }\n        else {\n            int x = a[top];\n            return x;\n        }\n    }<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ce9afa3 elementor-alert-warning elementor-widget elementor-widget-alert\" data-id=\"ce9afa3\" data-element_type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Fact 2:<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\"><b>Stack pointer (top) is the key control element:\n<\/b>\n<br>\nAll stack operations depend on a single variable, usually called top, which always points to the most recently added element. Incorrect handling of top leads directly to overflow or underflow errors.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f2b35ba elementor-hidden-desktop elementor-widget elementor-widget-image\" data-id=\"f2b35ba\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/prepinstaprime.com\/syllabus\/dsa-in-java-syllabus?utm_source=java_dsa_pages&#038;utm_medium=prepinsta&#038;utm_campaign=dsa_prep\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"314\" src=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp\" class=\"attachment-large size-large wp-image-1629361\" alt=\"\" srcset=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/5hrgWVyr-learn-dsa-with-java-300x92.webp 300w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp 1024w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-768x235.webp 768w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1536x471.webp 1536w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-2048x628.webp 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59093f7 elementor-hidden-tablet elementor-hidden-mobile elementor-widget elementor-widget-image\" data-id=\"59093f7\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/prepinstaprime.com\/syllabus\/dsa-in-java-syllabus?utm_source=java_dsa_pages&#038;utm_medium=prepinsta&#038;utm_campaign=dsa_prep\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"314\" src=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp\" class=\"elementor-animation-grow attachment-large size-large wp-image-1629361\" alt=\"\" srcset=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/5hrgWVyr-learn-dsa-with-java-300x92.webp 300w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp 1024w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-768x235.webp 768w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1536x471.webp 1536w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-2048x628.webp 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74253bc elementor-widget elementor-widget-heading\" data-id=\"74253bc\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Java Code to Implement Stack as an Array<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9229f9b txtDown elementor-widget elementor-widget-text-editor\" data-id=\"9229f9b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"try-it-main-div\">\n<a class=\"ls-try-it\" data-langid=\"62\" data-id=\"10\">Run<\/a>\n<pre class=\"lscodehighlight\" data-id=\"10\">\/**\n * Representation of a Stack as an Array in Java\n * Demonstrates push, pop, peek, isEmpty, and isFull operations.\n *\/\nimport java.util.Scanner;\n\nclass ArrayStack {\n    private int[] arr;      \/\/ Array to store stack elements\n    private int top;        \/\/ Index of the top element\n    private int capacity;   \/\/ Max capacity of the stack\n\n    \/\/ Constructor to initialize stack\n    public ArrayStack(int size) {\n        capacity = size;\n        arr = new int[capacity];\n        top = -1;  \/\/ Indicates an empty stack\n    }\n\n    \/\/ Push operation: add value to stack\n    public void push(int value) {\n        if (isFull()) {\n            System.out.println(\"Stack Overflow: Cannot push \" + value);\n        } else {\n            arr[++top] = value;\n            System.out.println(value + \" pushed into stack\");\n        }\n    }\n\n    \/\/ Pop operation: remove and return top element\n    public int pop() {\n        if (isEmpty()) {\n            System.out.println(\"Stack Underflow: No elements to pop\");\n            return -1;\n        } else {\n            return arr[top--];\n        }\n    }\n\n    \/\/ Peek operation: return top without removing\n    public int peek() {\n        if (isEmpty()) {\n            System.out.println(\"Stack is empty\");\n            return -1;\n        }\n        return arr[top];\n    }\n\n    \/\/ Check if stack is empty\n    public boolean isEmpty() {\n        return top == -1;\n    }\n\n    \/\/ Check if stack is full\n    public boolean isFull() {\n        return top == capacity - 1;\n    }\n\n    \/\/ Main method to test stack\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n        System.out.print(\"Enter stack capacity: \");\n        int size = sc.nextInt();\n\n        ArrayStack stack = new ArrayStack(size);\n\n        stack.push(10);\n        stack.push(20);\n        stack.push(30);\n\n        System.out.println(\"Top element is: \" + stack.peek());\n\n        System.out.println(\"Popped: \" + stack.pop());\n        System.out.println(\"Popped: \" + stack.pop());\n\n        System.out.println(\"Top element is now: \" + stack.peek());\n\n        sc.close();\n    }\n}\n<\/pre>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d076c8 txtDown elementor-widget elementor-widget-text-editor\" data-id=\"6d076c8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3>Input:<\/h3>\n<pre><strong>Enter stack capacity: 3<\/strong><\/pre>\n<h3>Output:<\/h3>\n<pre>\n10 pushed into stack\n20 pushed into stack\n30 pushed into stack\nTop element is: 30\nPopped: 30\nPopped: 20\nTop element is now: 10\n<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-58b2bef elementor-hidden-tablet elementor-hidden-mobile elementor-widget elementor-widget-image\" data-id=\"58b2bef\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/prepinstaprime.com\/syllabus\/dsa-in-java-syllabus?utm_source=java_dsa_pages&#038;utm_medium=prepinsta&#038;utm_campaign=dsa_prep\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"314\" src=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp\" class=\"elementor-animation-grow attachment-large size-large wp-image-1629361\" alt=\"\" srcset=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/5hrgWVyr-learn-dsa-with-java-300x92.webp 300w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp 1024w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-768x235.webp 768w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1536x471.webp 1536w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-2048x628.webp 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3af1a03 elementor-hidden-desktop elementor-widget elementor-widget-image\" data-id=\"3af1a03\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/prepinstaprime.com\/syllabus\/dsa-in-java-syllabus?utm_source=java_dsa_pages&#038;utm_medium=prepinsta&#038;utm_campaign=dsa_prep\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"314\" src=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp\" class=\"attachment-large size-large wp-image-1629361\" alt=\"\" srcset=\"https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/5hrgWVyr-learn-dsa-with-java-300x92.webp 300w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1024x314.webp 1024w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-768x235.webp 768w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-1536x471.webp 1536w, https:\/\/files.prepinsta.com\/wp-content\/uploads\/2025\/05\/learn-dsa-with-java-2048x628.webp 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f79aa7f elementor-widget elementor-widget-heading\" data-id=\"f79aa7f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Representation of  Stack as an Array Analysis<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f29bfca txtDown elementor-widget elementor-widget-text-editor\" data-id=\"f29bfca\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3>Time and Space Complexity for Stack as an Array:<\/h3><div class=\"table-grey\"><table class=\"table\"><thead><tr><th>Operation<\/th><th>Time Complexity<\/th><th>Space Complexity<\/th><\/tr><\/thead><tbody><tr><td>push<\/td><td>O(1)<\/td><td>O(1)<\/td><\/tr><tr><td>pop<\/td><td>O(1)<\/td><td>O(1)<\/td><\/tr><tr><td>peek<\/td><td>O(1)<\/td><td>O(1)<\/td><\/tr><tr><td>isEmpty<\/td><td>O(1)<\/td><td>O(1)<\/td><\/tr><tr><td>isFull<\/td><td>O(1)<\/td><td>O(1)<\/td><\/tr><\/tbody><\/table><\/div><p><span style=\"color: #ff0000;\"><strong>Note:<\/strong><\/span><\/p><ul><li><strong>All operations run in constant time because they involve simple arithmetic and array indexing. <\/strong><\/li><li><strong>Space complexity (additional) is constant, although the array itself uses O(n) space where n is the capacity.<\/strong><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9f6c805 elementor-alert-info elementor-widget elementor-widget-alert\" data-id=\"9f6c805\" data-element_type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Fact 3:<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\"><b>Array stack implementation is commonly used in interviews:\n<\/b>\n<br>\nImplementing a stack using an array is a frequently asked beginner level interview question because it tests understanding of indexing, boundary conditions, and basic algorithmic logic.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-233e8f9\" data-id=\"233e8f9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7ded76 elementor-widget elementor-widget-global elementor-global-1438692 elementor-widget-image\" data-id=\"c7ded76\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/bit.ly\/dsa-adv\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"286\" src=\"https:\/\/files.prepinsta.com\/2023\/02\/dsa-1024x286.webp\" class=\"elementor-animation-grow attachment-large size-large wp-image-1438691\" alt=\"\" srcset=\"https:\/\/files.prepinsta.com\/2023\/02\/eKSOlRSW-dsa-300x84.webp 300w, https:\/\/files.prepinsta.com\/2023\/02\/dsa-1024x286.webp 1024w, https:\/\/files.prepinsta.com\/2023\/02\/dsa-768x215.webp 768w, https:\/\/files.prepinsta.com\/2023\/02\/dsa.webp 1238w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f960ab1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f960ab1\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dd0199a\" data-id=\"dd0199a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-99a849b elementor-widget elementor-widget-heading\" data-id=\"99a849b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d53d91b elementor-widget elementor-widget-accordion\" data-id=\"d53d91b\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2231\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-2231\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-chevron-down\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-chevron-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">1. Why use an array to implement a stack?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2231\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-2231\"><p><strong>Answer:<\/strong><\/p><p>Using an array provides fast access and simple operations. Array implementation is easy and efficient when stack size is known in advance.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d86ab9f elementor-widget elementor-widget-accordion\" data-id=\"d86ab9f\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2261\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-2261\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-chevron-down\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-chevron-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">2. What happens when you push to a full stack?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2261\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-2261\"><p><strong>Answer:<\/strong><\/p><p>This condition is called Stack Overflow. The stack cannot accept new elements if it has reached its capacity.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-642c073 elementor-widget elementor-widget-accordion\" data-id=\"642c073\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1051\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1051\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-chevron-down\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-chevron-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">3. What is the time complexity of push and pop?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1051\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1051\"><p><strong>Answer:<\/strong><\/p><p>Both push and pop operations run in constant time (O(1)) because they perform simple index updates and value assignments.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8c40744 elementor-widget elementor-widget-accordion\" data-id=\"8c40744\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1471\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1471\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-chevron-down\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-chevron-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">4. How is the top tracked in an array stack?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1471\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1471\"><p><strong>Answer:<\/strong><\/p><p data-start=\"6679\" data-end=\"6793\">You use an index variable (top) that starts at -1 and increases with each push or decreases with each pop.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4853518 elementor-widget elementor-widget-accordion\" data-id=\"4853518\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-7581\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-7581\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-chevron-down\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-chevron-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">5. Can I use a dynamic array instead of a fixed array?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-7581\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-7581\"><p><strong>Answer:<\/strong><\/p><p>Yes, Using structures like ArrayList enables dynamic resizing, avoiding overflow limits. However, that is beyond basic fixed array implementation.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f2e7f80 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f2e7f80\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e37a61c\" data-id=\"e37a61c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f948c20 elementor-widget elementor-widget-global elementor-global-1265780 elementor-widget-template\" data-id=\"f948c20\" data-element_type=\"widget\" data-widget_type=\"template.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-template\">\n\t\t\t\t\t<div data-elementor-type=\"section\" data-elementor-id=\"1265771\" class=\"elementor elementor-1265771\" data-elementor-post-type=\"elementor_library\">\n\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-67ad0f94 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"67ad0f94\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2ce4f614\" data-id=\"2ce4f614\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-3e6b0f8b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e6b0f8b\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-7041984d\" data-id=\"7041984d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2ab820c4 elementor-widget elementor-widget-heading\" data-id=\"2ab820c4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><b>Get over 200+ course One Subscription<\/b><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a0d7bb8 elementor-widget elementor-widget-text-editor\" data-id=\"5a0d7bb8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #5a5a5a; font-size: 14px;\">Courses like AI\/ML, Cloud Computing, Ethical Hacking, C, C++, Java, Python, DSA (All Languages), Competitive Coding (All Languages), TCS, Infosys, Wipro, Amazon, DBMS, SQL and others<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-859c233 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"859c233\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-711597b4\" data-id=\"711597b4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3d89c3bb elementor-align-left elementor-widget elementor-widget-button\" data-id=\"3d89c3bb\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg elementor-animation-grow\" href=\"https:\/\/prepinstaprime.com\/purchase\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Get Prime<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-d6f9eab\" data-id=\"d6f9eab\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1e9337d elementor-align-left elementor-hidden-phone elementor-widget elementor-widget-button\" data-id=\"1e9337d\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg\" href=\"https:\/\/prepinstaprime.com\/course-list\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Course List<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-18d53ce elementor-align-left elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-button\" data-id=\"18d53ce\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg\" href=\"https:\/\/prepinstaprime.com\/course-list\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\"><span style=\"color:#000\">Course List<\/span><\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-2eca6b68\" data-id=\"2eca6b68\" data-element_type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-50101d59 elementor-widget elementor-widget-video\" data-id=\"50101d59\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/ovH7g4Mbia8&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;play_on_mobile&quot;:&quot;yes&quot;,&quot;mute&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;,&quot;yt_privacy&quot;:&quot;yes&quot;,&quot;video_type&quot;:&quot;youtube&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-1dae8f03 elementor-widget elementor-widget-spacer\" data-id=\"1dae8f03\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-59e15135 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"59e15135\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-19725e68\" data-id=\"19725e68\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-676c7f09 elementor-hidden-phone elementor-widget elementor-widget-heading\" data-id=\"676c7f09\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-medium\"><span>Checkout list of all the video courses in PrepInsta Prime Subscription<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3806887 elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-heading\" data-id=\"3806887\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span>Checkout list of all the video courses in PrepInsta Prime Subscription<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1610604e\" data-id=\"1610604e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1d487e48 elementor-hidden-phone elementor-widget elementor-widget-button\" data-id=\"1d487e48\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg\" href=\"https:\/\/prepinstaprime.com\/course-list\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Checkout<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-033a21a elementor-mobile-align-center elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-button\" data-id=\"033a21a\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg\" href=\"https:\/\/prepinstaprime.com\/course-list\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\"><span style=\"color:#000\">Checkout<\/span><\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Representation of a Stack as an Array in Java Representation of a Stack as an Array in Java is one of the simplest and most commonly taught ways to understand how stacks work internally. In this approach, a stack is implemented using a fixed size array along with a variable that keeps track of the [&hellip;]<\/p>\n","protected":false},"author":2097685,"featured_media":0,"parent":49682,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-656446","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/pages\/656446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/users\/2097685"}],"replies":[{"embeddable":true,"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/comments?post=656446"}],"version-history":[{"count":0,"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/pages\/656446\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/pages\/49682"}],"wp:attachment":[{"href":"https:\/\/prepinsta.com\/wp-json\/wp\/v2\/media?parent=656446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}