Welcome to the Complete Java Full Course 2026. This structured Java tutorial series is designed to take you from absolute beginner to advanced level in Java programming. In this playlist, you will learn: • Java Basics • Variables & Data Types • OOP Concepts (Encapsulation, Inheritance, Polymorphism, Abstraction) • Constructors & Methods • Static & Non-static concepts • Memory Management in Java • Collections Framework • Exception Handling • Multithreading • Java for Placements & Interviews This course is perfect for: College students Beginners starting programming Placement preparation Software engineering interviews DSA preparation Anyone who wants strong Java fundamentals Each lecture is structured step-by-step with deep conceptual clarity and practical examples. Start from Lecture 1 and follow the playlist in sequence for best results. Subscribe and stay consistent. Java mastery requires structured learning. Github Link for Notes & Code : https://github.com/adityatandon15/Java-Full-Course java full course 2026, java tutorial for beginners, learn java step by step, complete java course, java programming course, java for placements, java interview preparation, java beginner to advanced, java dsa preparation, java oops concepts, java fundamentals, java basics to advanced
Curated by: Coder Army (57 videos)
Understanding Java deeply requires clarity on small but powerful concepts that many developers overlook. In this lecture we explore several important Java core concepts including why Java allows only one public class per file, how wrapper classes work, the mechanics behind autoboxing and unboxing, and the Integer caching mechanism inside the JVM. We also cover common interview questions on abstract classes and explain POJO (Plain Old Java Object) classes, which are widely used in frameworks like Spring Boot and Hibernate. This video is extremely useful for Java beginners, backend developers, and students preparing for Java interviews. What You Will Learn • Why Java restricts a file to one public class • What Wrapper Classes are and why they exist • Autoboxing and Unboxing in Java • When Java automatically performs boxing/unboxing • Why NullPointerException happens during unboxing • Difference between == and .equals() • Internal working of the Integer class • Integer caching mechanism in JVM • Important Abstract Class interview questions • What are POJO classes and why frameworks rely on them Why Learn Java? Java is one of the most powerful and widely used programming languages in the world. It is used in: Backend development Enterprise applications Android development Banking systems Large-scale distributed systems If you want to master Data Structures, Spring Boot, Microservices, or System Design, Java fundamentals are essential. Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f Join System Design Whatsapp Group: https://whatsapp.com/channel/0029VbBF1XKF1YlMyYuPM23s Code and Notes: Github : https://github.com/adityatandon15/Java-Full-Course We offer paid course on Dsa, web development, blockchain, system design and GenAI. Join our Paid Course: https://strikes.in/ Coder Army: https://coderarmy.in/#home Coder Army app: https://play.google.com/store/apps/details?id=com.rohit.negi Connect with Aditya Tandon Instagram : https://www.instagram.com/adityatandon2 LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 Timestamps: 00:00 Intro 00:39 Why only one public class per file? 08:14 Wrapper classes 16:24 Autoboxing & Unboxing 29:35 When is Autoboxing/Unboxing is applied? 32:26 NullPointerException in Autoboxing 34:28 '==' operator vs equals() 44:03 Conceptual view of Integer class 47:20 Caching inside Integer class 52:48 Interview specific Questions on Abstract classes 01:04:56 POJO classes Java wrapper classes, autoboxing in java, unboxing in java, integer caching java, java pojo class, java interview questions, java integer class, java equals vs operator, java core concepts, java backend development, java programming tutorial, learn java programming, java full course, java tutorial for beginners