{"id":818,"date":"2024-11-30T08:45:43","date_gmt":"2024-11-30T08:45:43","guid":{"rendered":"https:\/\/vithleshgupta.com\/?page_id=818"},"modified":"2025-08-06T01:42:00","modified_gmt":"2025-08-06T01:42:00","slug":"arraylist","status":"publish","type":"page","link":"https:\/\/vithleshgupta.com\/index.php\/arraylist\/","title":{"rendered":"ArrayList"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"818\" class=\"elementor elementor-818\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-381ff20 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"381ff20\" 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-top-column elementor-element elementor-element-8e0df96 elementor-hidden-mobile\" data-id=\"8e0df96\" 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href=\"https:\/\/vithleshgupta.com\/index.php\/helloworld\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Learn Java<\/span><button class=\"bellows-subtoggle\" aria-label=\"Toggle Submenu\"><i class=\"bellows-subtoggle-icon-expand fa fa-chevron-down\"><\/i><i class=\"bellows-subtoggle-icon-collapse fa fa-chevron-up\"><\/i><\/button><\/a>\n<ul class=\"bellows-submenu\">\n\t<li id=\"menu-item-970\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-home bellows-menu-item-970 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Java Basics Part 1<\/span><\/a><\/li>\n\t<li id=\"menu-item-1033\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-1033 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/java-basics-part-2\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Java Basics Part 2<\/span><\/a><\/li>\n\t<li id=\"menu-item-1045\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-1045 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-1\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Java OOPS Part 1<\/span><\/a><\/li>\n\t<li id=\"menu-item-1044\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-1044 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-2\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Java OOPS Part 2<\/span><\/a><\/li>\n\t<li id=\"menu-item-658\" class=\"bellows-menu-item 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class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">While Loop<\/span><\/a><\/li>\n\t<li id=\"menu-item-657\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-657 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/for-loop\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">For Loop<\/span><\/a><\/li>\n\t<li id=\"menu-item-656\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-656 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/do-while-loop\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Do While Loop<\/span><\/a><\/li>\n\t<li id=\"menu-item-654\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-654 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/break-statement\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Break Statement<\/span><\/a><\/li>\n\t<li id=\"menu-item-655\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-655 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/continue-statement\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Continue Statement<\/span><\/a><\/li>\n\t<li id=\"menu-item-786\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-786 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/try-catch-statement\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Try Catch Statement<\/span><\/a><\/li>\n\t<li id=\"menu-item-897\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-897 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/arraylist\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">ArrayList<\/span><\/a><\/li>\n\t<li id=\"menu-item-896\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-896 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/hashset\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">HashSet<\/span><\/a><\/li>\n\t<li id=\"menu-item-895\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-895 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/hashmap\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">HashMap<\/span><\/a><\/li>\n\t<li id=\"menu-item-892\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-892 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/iterate-hashmap\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Iterate HashMap<\/span><\/a><\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-724\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-has-children bellows-menu-item-724 bellows-item-level-0\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/learn-selenium\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Learn Selenium<\/span><button class=\"bellows-subtoggle\" aria-label=\"Toggle Submenu\"><i class=\"bellows-subtoggle-icon-expand fa fa-chevron-down\"><\/i><i class=\"bellows-subtoggle-icon-collapse fa fa-chevron-up\"><\/i><\/button><\/a>\n<ul class=\"bellows-submenu\">\n\t<li 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menu-link\"><span class=\"bellows-target-title bellows-target-text\">HTML CSS JavaScript<\/span><\/a><\/li>\n\t<li id=\"menu-item-1068\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-1068 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/css-selector\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">CSS Selector<\/span><\/a><\/li>\n\t<li id=\"menu-item-1067\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-1067 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/xpath-types\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Xpath types<\/span><\/a><\/li>\n\t<li id=\"menu-item-765\" class=\"bellows-menu-item bellows-menu-item-type-post_type bellows-menu-item-object-page bellows-menu-item-765 bellows-item-level-1\"><a  href=\"https:\/\/vithleshgupta.com\/index.php\/practice-page\/\" class=\"bellows-target menu-link\"><span class=\"bellows-target-title bellows-target-text\">Practice Page<\/span><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul><\/nav><\/p>\n<\/aside>\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-top-column elementor-element elementor-element-d2a1565\" data-id=\"d2a1565\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-68768b2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"68768b2\" 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-inner-column elementor-element elementor-element-6df6bd9\" data-id=\"6df6bd9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ff6a663 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"ff6a663\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.14.0 - 26-06-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p style=\"margin-top: 0.5em; margin-bottom: 1em; color: #202122; font-family: sans-serif; font-size: 20px; font-style: normal;\"><span style=\"color: #ff0000;\"><b>Arraylist &#8211; In Java<\/b><\/span><\/p>\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\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-8110715 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8110715\" 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-inner-column elementor-element elementor-element-f65b2ca\" data-id=\"f65b2ca\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-103c960 elementor-widget elementor-widget-code-highlight\" data-id=\"103c960\" data-element_type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"prismjs-default copy-to-clipboard \">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-javascript line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-javascript\">\n\t\t\t\t\t<xmp>import java.util.ArrayList;\r\n\r\npublic class Program1 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tArrayList<String> countries = new ArrayList<String>();\r\n\t\tcountries.add(\"India\");\r\n\t\tcountries.add(\"USA\");\r\n\t\tcountries.add(\"China\");\r\n\t\tcountries.add(\"Russia\");\r\n\t\tSystem.out.println(countries);\r\n\t}\r\n\r\n}<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\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\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-84460aa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"84460aa\" 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-inner-column elementor-element elementor-element-f0923ce\" data-id=\"f0923ce\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-1fc5897 elementor-widget elementor-widget-text-editor\" data-id=\"1fc5897\" 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\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c414c84 elementor-widget elementor-widget-text-editor\" data-id=\"c414c84\" 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<div style=\"background-color: #ffffff; padding: 0px 0px 0px 2px;\"><p><strong>\ud83e\uddfe Output:<\/strong><\/p><p><strong><span style=\"color: #000000; font-size: 13.3333px; font-family: 'Courier New'; white-space: pre;\">[India, USA, China, Russia]<\/span><\/strong><\/p><h3 data-start=\"716\" data-end=\"746\">\ud83d\udca1 What is an ArrayList?<\/h3><ul data-start=\"748\" data-end=\"922\"><li data-start=\"748\" data-end=\"807\"><p data-start=\"750\" data-end=\"807\">A <strong data-start=\"752\" data-end=\"771\">resizable array<\/strong> in Java (from <code data-start=\"786\" data-end=\"797\">java.util<\/code> package).<\/p><\/li><li data-start=\"808\" data-end=\"862\"><p data-start=\"810\" data-end=\"862\">Can store a list of objects (in this case, Strings).<\/p><\/li><li data-start=\"863\" data-end=\"922\"><p data-start=\"865\" data-end=\"922\">Allows dynamic addition, removal, and retrieval of items.<\/p><\/li><\/ul><hr data-start=\"924\" data-end=\"927\" \/><h3 data-start=\"929\" data-end=\"954\">\ud83e\udde0 Common Operations:<\/h3><div class=\"_tableContainer_16hzy_1\"><div class=\"_tableWrapper_16hzy_14 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"956\" data-end=\"1563\"><thead data-start=\"956\" data-end=\"1031\"><tr data-start=\"956\" data-end=\"1031\"><th data-start=\"956\" data-end=\"991\" data-col-size=\"sm\">Operation<\/th><th data-start=\"991\" data-end=\"1031\" data-col-size=\"sm\">Example Code<\/th><\/tr><\/thead><tbody data-start=\"1108\" data-end=\"1563\"><tr data-start=\"1108\" data-end=\"1183\"><td data-start=\"1108\" data-end=\"1143\" data-col-size=\"sm\">Add an element<\/td><td data-col-size=\"sm\" data-start=\"1143\" data-end=\"1183\"><code data-start=\"1145\" data-end=\"1170\">countries.add(\"Japan\");<\/code><\/td><\/tr><tr data-start=\"1184\" data-end=\"1259\"><td data-start=\"1184\" data-end=\"1219\" data-col-size=\"sm\">Get an element by index<\/td><td data-col-size=\"sm\" data-start=\"1219\" data-end=\"1259\"><code data-start=\"1221\" data-end=\"1249\">countries.get(0); \/\/ India<\/code><\/td><\/tr><tr data-start=\"1260\" data-end=\"1335\"><td data-start=\"1260\" data-end=\"1295\" data-col-size=\"sm\">Set (replace) an element<\/td><td data-col-size=\"sm\" data-start=\"1295\" data-end=\"1335\"><code data-start=\"1297\" data-end=\"1322\">countries.set(1, \"UK\");<\/code><\/td><\/tr><tr data-start=\"1336\" data-end=\"1411\"><td data-start=\"1336\" data-end=\"1371\" data-col-size=\"sm\">Remove an element<\/td><td data-col-size=\"sm\" data-start=\"1371\" data-end=\"1411\"><code data-start=\"1373\" data-end=\"1401\">countries.remove(\"China\");<\/code><\/td><\/tr><tr data-start=\"1412\" data-end=\"1487\"><td data-start=\"1412\" data-end=\"1447\" data-col-size=\"sm\">Size of the list<\/td><td data-col-size=\"sm\" data-start=\"1447\" data-end=\"1487\"><code data-start=\"1449\" data-end=\"1468\">countries.size();<\/code><\/td><\/tr><tr data-start=\"1488\" data-end=\"1563\"><td data-start=\"1488\" data-end=\"1523\" data-col-size=\"sm\">Loop through elements (for-each)<\/td><td data-col-size=\"sm\" data-start=\"1523\" data-end=\"1563\"><code data-start=\"1525\" data-end=\"1555\">for(String c : countries) {}<\/code><\/td><\/tr><\/tbody><\/table><div class=\"sticky end-(--thread-content-margin) h-0 self-end select-none\"><div class=\"absolute end-0 flex items-end\">\u00a0<\/div><\/div><\/div><\/div><hr data-start=\"1565\" data-end=\"1568\" \/><h3 data-start=\"1570\" data-end=\"1611\">\ud83d\udd01 Example: Looping through the list:<\/h3><div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\"><div class=\"sticky top-9\"><div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\"><div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\">\u00a0<\/div><\/div><\/div><div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-java\"><span class=\"hljs-keyword\">for<\/span> (String country : countries) <\/code><code class=\"whitespace-pre! language-java\">{<br \/>\n<\/code><\/div><div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-java\">    System.out.println(<span class=\"hljs-string\">\"Country: \"<\/span> + country);<br \/>\n<\/code><\/div><div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-java\">}<\/code><\/div><\/div><\/div>\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\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Arraylist &#8211; In Java import java.util.ArrayList; public class Program1 { public static void main(String[] args) { ArrayList countries = new ArrayList(); countries.add(&#8220;India&#8221;); countries.add(&#8220;USA&#8221;); countries.add(&#8220;China&#8221;); countries.add(&#8220;Russia&#8221;); System.out.println(countries); } } \ud83e\uddfe Output: [India, USA, China, Russia] \ud83d\udca1 What is an ArrayList? A resizable array in Java (from java.util package). Can store a list of objects (in this &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/vithleshgupta.com\/index.php\/arraylist\/\"> <span class=\"screen-reader-text\">ArrayList<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"disabled","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"class_list":["post-818","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/comments?post=818"}],"version-history":[{"count":40,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/818\/revisions"}],"predecessor-version":[{"id":1250,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/818\/revisions\/1250"}],"wp:attachment":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/media?parent=818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}