{"id":1036,"date":"2025-08-04T15:24:25","date_gmt":"2025-08-04T15:24:25","guid":{"rendered":"https:\/\/vithleshgupta.com\/?page_id=1036"},"modified":"2025-08-04T15:28:34","modified_gmt":"2025-08-04T15:28:34","slug":"java-oops-part-2","status":"publish","type":"page","link":"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-2\/","title":{"rendered":"Java OOPS Part 2"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1036\" class=\"elementor elementor-1036\">\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\" 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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-3177166 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3177166\" 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-dac12e7\" data-id=\"dac12e7\" 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-9a7198e elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"9a7198e\" 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\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c80d42a elementor-widget elementor-widget-html\" data-id=\"c80d42a\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h1>Essential Java Collections and Exception Handling Tutorial<\/h1>\r\n\r\n<h2>1. ArrayList Class \u2013 <code>add<\/code>, <code>get<\/code>, <code>set<\/code>, <code>remove<\/code>, <code>size<\/code><\/h2>\r\n<pre><code>import java.util.ArrayList;\r\n\r\nArrayList&lt;String&gt; list = new ArrayList&lt;&gt;();\r\nlist.add(\"A\");                  \/\/ add\r\nlist.add(\"B\"); \r\nString item = list.get(1);      \/\/ get\r\nlist.set(0, \"C\");               \/\/ set\r\nlist.remove(\"B\");               \/\/ remove by value\r\nint sz = list.size();           \/\/ size\r\n<\/code><\/pre>\r\n\r\n<h2>2. Looping through an ArrayList<\/h2>\r\n<pre><code>\/\/ Index-based loop\r\nfor(int i=0; i&lt;list.size(); i++) {\r\n    System.out.println(list.get(i));\r\n}\r\n\r\n\/\/ Enhanced for\r\nfor(String s : list) {\r\n    System.out.println(s);\r\n}\r\n\r\n\/\/ Using Iterator\r\nimport java.util.Iterator;\r\nIterator&lt;String&gt; it = list.iterator();\r\nwhile(it.hasNext()) {\r\n    System.out.println(it.next());\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>3. Sorting an ArrayList<\/h2>\r\n<pre><code>import java.util.Collections;\r\nCollections.sort(list); \/\/ Sorts in natural order\r\n<\/code><\/pre>\r\n\r\n<h2>4. LinkedList<\/h2>\r\n<pre><code>import java.util.LinkedList;\r\n\r\nLinkedList&lt;String&gt; llist = new LinkedList&lt;&gt;();\r\nllist.add(\"Dog\");\r\nllist.addFirst(\"Cat\");\r\nllist.addLast(\"Parrot\");\r\nllist.remove(\"Cat\");\r\nSystem.out.println(llist);\r\n<\/code><\/pre>\r\n\r\n<h2>5. HashMap \u2013 Key, Value Pair<\/h2>\r\n<pre><code>import java.util.HashMap;\r\n\r\nHashMap&lt;String, Integer&gt; map = new HashMap&lt;&gt;();\r\nmap.put(\"John\", 24);\r\nmap.put(\"Jane\", 32);\r\nint age = map.get(\"John\");\r\nmap.remove(\"Jane\");\r\n<\/code><\/pre>\r\n\r\n<h2>6. HashSet \u2013 add, remove, contains<\/h2>\r\n<pre><code>import java.util.HashSet;\r\n\r\nHashSet&lt;String&gt; set = new HashSet&lt;&gt;();\r\nset.add(\"Red\");\r\nset.add(\"Blue\");\r\nset.remove(\"Red\");\r\nboolean hasBlue = set.contains(\"Blue\");\r\n<\/code><\/pre>\r\n\r\n<h2>7. Iterator<\/h2>\r\n<pre><code>Iterator&lt;String&gt; iter = set.iterator();\r\nwhile(iter.hasNext()) {\r\n    System.out.println(iter.next());\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>8. Map.EntrySet \u2013 Iterating a HashMap<\/h2>\r\n<pre><code>for(java.util.Map.Entry&lt;String, Integer&gt; entry : map.entrySet()) {\r\n    System.out.println(entry.getKey() + \": \" + entry.getValue());\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>9. Java Exception Handling<\/h2>\r\n<pre><code>try {\r\n    int result = 10 \/ 0;\r\n} catch(ArithmeticException e) {\r\n    System.out.println(\"Error: \" + e.getMessage());\r\n} finally {\r\n    System.out.println(\"Cleanup code always runs!\");\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>10. <code>throw<\/code> and <code>throws<\/code> Keywords<\/h2>\r\n<pre><code>public void checkAge(int age) throws Exception {\r\n    if(age &lt; 18) {\r\n        throw new Exception(\"Underage not allowed\");\r\n    }\r\n}\r\n<\/code><\/pre>\r\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65fc66b elementor-widget elementor-widget-text-editor\" data-id=\"65fc66b\" 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\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<\/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>Essential Java Collections and Exception Handling Tutorial 1. ArrayList Class \u2013 add, get, set, remove, size import java.util.ArrayList; ArrayList&lt;String&gt; list = new ArrayList&lt;&gt;(); list.add(&#8220;A&#8221;); \/\/ add list.add(&#8220;B&#8221;); String item = list.get(1); \/\/ get list.set(0, &#8220;C&#8221;); \/\/ set list.remove(&#8220;B&#8221;); \/\/ remove by value int sz = list.size(); \/\/ size 2. Looping through an ArrayList \/\/ Index-based &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-2\/\"> <span class=\"screen-reader-text\">Java OOPS Part 2<\/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-1036","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1036","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=1036"}],"version-history":[{"count":4,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1036\/revisions"}],"predecessor-version":[{"id":1043,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1036\/revisions\/1043"}],"wp:attachment":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/media?parent=1036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}