OOP in Java

1️⃣ Java is a ______ programming language. A) Low-levelB) Object-orientedC) Machine languageD) Assembly ✅ Answer: B 2️⃣ Which component executes Java bytecode? A) JDKB) JREC) JVMD) Compiler ✅ Answer: C 3️⃣ JDK stands for: A) Java…

Introduction In Java, writing code is not just about making it work — it is about making it secure, structured, and maintainable ☕ Imagine a situation where every variable in your program is accessible from anywhere.Anyone…

In Java, classes are usually defined separately.But sometimes, it makes logical sense to define a class inside another class 🧩 This concept is called Nested Classes. Nested classes improve: Code organization 📦 Logical grouping 🧠 Encapsulation…

✅ Question 1 class Student { String name; int age; Student(String n, int a) { name = n; age = a; } void display() { System.out.println(name + " " + age); } } public class Main…

✅ Question 1 class Student { String name; int marks; void setData(String n, int m) { name = n; marks = m; } void display() { System.out.println(name + " " + marks); } } public class…

Introduction In Java, most things revolve around objects ☕But sometimes, certain members belong not to objects, but to the class itself. That is where the static keyword comes into play. The static keyword is one of…

Introduction 🧠 Fundamental Concept: How Java Passes Arguments Java is strictly pass-by-value. But here is the important part: For primitive types → value is copied For objects → reference value is copied 📌 That means:When passing…

Practicing program-based questions is essential for mastering Object-Oriented Programming concepts in Java ☕Most examinations and lab assignments ask questions in a structured, descriptive format, where the problem statement clearly specifies: Attributes of a class Required methods…

In Java, writing programs is not just about using loops, conditions, and variables.The real power of Java comes from organizing logic into reusable units, and that unit is called a method 🧩 As applications grow, Java…

Introduction In Java, objects are accessed using references, and many important concepts revolve around understanding which object is being referred to at a given moment 🧠This is where the this keyword plays a crucial role. The…