{"id":1034,"date":"2025-08-04T15:24:09","date_gmt":"2025-08-04T15:24:09","guid":{"rendered":"https:\/\/vithleshgupta.com\/?page_id=1034"},"modified":"2025-08-04T15:26:12","modified_gmt":"2025-08-04T15:26:12","slug":"java-oops-part-1","status":"publish","type":"page","link":"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-1\/","title":{"rendered":"Java OOPS Part 1"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1034\" class=\"elementor elementor-1034\">\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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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>Java Object-Oriented Programming Concepts<\/h1>\r\n\r\n<h2>1. Object-Oriented Programming (OOP)<\/h2>\r\n<p>OOP is a paradigm based on the concept of \"objects,\" which contain data (attributes) and methods (functions). Java is an object-oriented language.<\/p>\r\n\r\n<h2>2. Class, Objects, Attributes, and Methods<\/h2>\r\n<ul>\r\n  <li><strong>Class<\/strong>: Blueprint for creating objects.<br>\r\n    <code>\r\n    public class Student {<br>\r\n    &nbsp;&nbsp;String name;<br>\r\n    &nbsp;&nbsp;int rollNo;<br>\r\n    &nbsp;&nbsp;void printDetails() {<br>\r\n    &nbsp;&nbsp;&nbsp;&nbsp;System.out.println(name + \", \" + rollNo);<br>\r\n    &nbsp;&nbsp;}<br>\r\n    }\r\n    <\/code>\r\n  <\/li>\r\n  <li><strong>Object<\/strong>: An instance of a class.<br>\r\n    <code>Student s1 = new Student();<\/code>\r\n  <\/li>\r\n  <li><strong>Attributes<\/strong>: Variables defined within a class (e.g., <code>name<\/code>, <code>rollNo<\/code>).<\/li>\r\n  <li><strong>Methods<\/strong>: Functions defined within a class (e.g., <code>printDetails()<\/code>).<\/li>\r\n<\/ul>\r\n\r\n<h2>3. The <code>new<\/code> Keyword<\/h2>\r\n<p>Used to create new objects:<\/p>\r\n<code>Student s1 = new Student();<\/code>\r\n\r\n<h2>4. Encapsulation<\/h2>\r\n<p>Encapsulation bundles data (attributes) and methods inside a class, protecting internal state by using private fields and public getters\/setters.<\/p>\r\n<pre><code>class Programmer {\r\n  private String name;\r\n  \r\n  public String getName() { return name; }\r\n  public void setName(String name) { this.name = name; }\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>5. Static Method<\/h2>\r\n<p>A static method belongs to the class rather than any object instance. Called via the class name.<\/p>\r\n<pre><code>public class MathUtil {\r\n  public static int add(int x, int y) { return x + y; }\r\n}\r\nint sum = MathUtil.add(2, 3);\r\n<\/code><\/pre>\r\n\r\n<h2>6. Java Constructor<\/h2>\r\n<p>A constructor initializes objects. It has no return type and shares the class name.<\/p>\r\n<pre><code>class Student {\r\n  String name;\r\n  \r\n  Student(String n) {\r\n    this.name = n;\r\n  }\r\n}\r\nStudent s1 = new Student(\"Ram\");\r\n<\/code><\/pre>\r\n\r\n<h2>7. <code>this<\/code> Keyword<\/h2>\r\n<p>Refers to the current object, helping differentiate instance variables from parameters:<\/p>\r\n<pre><code>public class Point {\r\n  int x;\r\n  \r\n  Point(int x) {\r\n    this.x = x;\r\n  }\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>8. Java Inheritance (<code>extends<\/code>)<\/h2>\r\n<p>Inheritance allows a subclass to inherit fields and methods from a superclass.<\/p>\r\n<pre><code>class Animal { void eat() {} }\r\nclass Dog extends Animal { void bark() {} }\r\n<\/code><\/pre>\r\n<p><strong>Superclass<\/strong>: The class being inherited from.<br>\r\n<strong>Subclass<\/strong>: The class that inherits.<\/p>\r\n\r\n<h2>9. <code>final<\/code> Keyword<\/h2>\r\n<ul>\r\n  <li><strong>final variable<\/strong>: Value cannot change (constant).<\/li>\r\n  <li><strong>final method<\/strong>: Cannot be overridden.<\/li>\r\n  <li><strong>final class<\/strong>: Cannot be subclassed.<\/li>\r\n<\/ul>\r\n<pre><code>final int MAX_SIZE = 100;\r\nfinal void display() {}\r\nfinal class Base {}\r\n<\/code><\/pre>\r\n\r\n<h2>10. Polymorphism<\/h2>\r\n<p>The ability for different classes to provide different implementations of methods with the same name.<\/p>\r\n<p><strong>Compile-time polymorphism<\/strong>: Method overloading.<br>\r\n<strong>Run-time polymorphism<\/strong>: Method overriding.<\/p>\r\n<pre><code>class Animal { void sound() { System.out.println(\"Generic Animal\"); } }\r\nclass Dog extends Animal { void sound() { System.out.println(\"Bark\"); } }\r\n\r\nAnimal a = new Dog();\r\na.sound(); \/\/ Output: Bark\r\n<\/code><\/pre>\r\n\r\n<h2>11. Inner Class<\/h2>\r\n<p>A class declared inside another class for better encapsulation.<\/p>\r\n<pre><code>class Outer {\r\n  class Inner { void display() {} }\r\n}\r\n\r\nOuter.Inner in = new Outer().new Inner();\r\n<\/code><\/pre>\r\n\r\n<h2>12. Abstract Class<\/h2>\r\n<p>Cannot be instantiated. Can have both abstract (no implementation) and concrete methods.<\/p>\r\n<pre><code>abstract class Animal {\r\n  abstract void makeSound();\r\n  void sleep() { System.out.println(\"Sleeping\"); }\r\n}\r\n\r\nclass Dog extends Animal {\r\n  void makeSound() { System.out.println(\"Bark\"); }\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>13. Interface<\/h2>\r\n<p>Defines abstract methods for full abstraction (Java 8+: default and static methods allowed).<\/p>\r\n<pre><code>interface Drawable {\r\n  void draw();\r\n}\r\n\r\nclass Circle implements Drawable {\r\n  public void draw() { System.out.println(\"Drawing Circle\"); }\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>14. <code>super<\/code> Keyword<\/h2>\r\n<p>Refers to the superclass\u2019s constructor or methods\/fields.<\/p>\r\n<pre><code>class Animal { void eat() { System.out.println(\"eat\"); } }\r\nclass Dog extends Animal {\r\n  void eat() { super.eat(); }\r\n}\r\n<\/code><\/pre>\r\n\r\n<h2>15. Constant<\/h2>\r\n<p>Use the <code>final<\/code> keyword for constants:<\/p>\r\n<pre><code>final double PI = 3.14159;\r\n<\/code><\/pre>\r\n\r\n<h2>16. Enum<\/h2>\r\n<p>Special classes representing a group of constants.<\/p>\r\n<pre><code>enum Day { MONDAY, TUESDAY, WEDNESDAY }\r\nDay d = Day.MONDAY;\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>Java Object-Oriented Programming Concepts 1. Object-Oriented Programming (OOP) OOP is a paradigm based on the concept of &#8220;objects,&#8221; which contain data (attributes) and methods (functions). Java is an object-oriented language. 2. Class, Objects, Attributes, and Methods Class: Blueprint for creating objects. public class Student { &nbsp;&nbsp;String name; &nbsp;&nbsp;int rollNo; &nbsp;&nbsp;void printDetails() { &nbsp;&nbsp;&nbsp;&nbsp;System.out.println(name + &#8220;, &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/vithleshgupta.com\/index.php\/java-oops-part-1\/\"> <span class=\"screen-reader-text\">Java OOPS Part 1<\/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-1034","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1034","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=1034"}],"version-history":[{"count":4,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1034\/revisions"}],"predecessor-version":[{"id":1040,"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/pages\/1034\/revisions\/1040"}],"wp:attachment":[{"href":"https:\/\/vithleshgupta.com\/index.php\/wp-json\/wp\/v2\/media?parent=1034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}