Wildcards in Generics | ?, ? extends, ? super | Java Full Course #28

In this video, we dive deep into Java Wildcards in Generics — one of the most confusing yet powerful concepts in Java. If you've ever struggled with ? (unknown type) ? extends T (upper bounded wildcard) ? super T (lower bounded wildcard) What you'll learn in this video: What is ? (Wildcard) in Java Generics Why wildcards are needed (real-world problem solving) Upper Bounded Wildcards → ? extends T Lower Bounded Wildcards → ? super T PECS Rule (Producer Extends, Consumer Super) explained intuitively Read vs Write restrictions in wildcards Internal logic: why compiler restricts certain operations Practical coding examples for interview + real-world usage 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/0029Va6H... Join System Design Whatsapp Group: https://whatsapp.com/channel/0029VbBF... Code and Notes: Github : https://github.com/adityatandon15/Jav... 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/de... Connect with Aditya Tandon Instagram :   / adityatandon2   LinkedIn :   / adityatandon2   Twitter : https://x.com/adityatandon02 Timestamps: java wildcards, java generics wildcards, wildcard in java, java extends vs super, java generics tutorial, java generics full course, java wildcard tutorial, java ? extends example, java ? super example, upper bounded wildcard java, lower bounded wildcard java, java PECS rule, producer extends consumer super java, java generics interview questions, java collections generics, java generics deep dive, learn java generics, java tutorial for beginners, java full course 2026, java programming, generics in java explained, java coding interview preparation