Java Programming - Ajay Dabade | Python & Java Learning Notes

7-Passing and Returning Objects from Methods in Java

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…

OOP in Java

6-OOPs Practice Programs in Java (Exam-Oriented)

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…

OOP in Java

5-Methods, Method Overloading, and Recursion in Java

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…

OOP in Java

4- this Keyword and Object References in 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…

OOP in Java

3-Constructors and Object Initialization in Java

Introduction In Java, creating an object is not just about allocating memory — it is also about initializing that memory correctly ☕This responsibility is handled by a special member of a class called a constructor. Constructors…

OOP in Java

2-Classes, Objects, and Methods in Java

Introduction Java is a class-based, object-oriented programming language, and everything in Java revolves around classes and objects ☕To write clean, structured, and maintainable Java programs, it is essential to clearly understand what classes are, what objects…

OOP in Java

1-Introduction to OOPs in Java (Object-Oriented Programming)

Java is a class-based, object-oriented programming language designed to build structured, reusable, and maintainable software ☕While basic Java focuses on syntax and control flow, Object-Oriented Programming (OOPs) focuses on design, structure, and real-world modeling. OOPs organizes…

Control Statements

ArrayList in Java – Complete Guide for Beginners (With Confusions, Examples & Common Mistakes)

Introduction to ArrayList in Java 📘 When beginners start learning Java, they usually begin with arrays. Arrays are powerful, but they come with a major limitation — fixed size. Once an array is created, its size…

Control Statements

Leetcode Programs for practice

Leet Code Problems: - 🟢 Level 1: Absolute Beginner (Math, Conditions, Simple Loops) (Perfect if you just learned for, while, if-else) Fizz Buzzhttps://leetcode.com/problems/fizz-buzz/ Number of Steps to Reduce a Number to Zerohttps://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/ Subtract the Product and…

Control Statements

String Methods in Java

String Methods in Java In Java, String is one of the most frequently used classes.Almost every Java program deals with text — names, input, passwords, messages, file data, etc. Java provides many built-in String methods to…