Why Java Collection Methods Use super & extends | addAll(), copy(),disjoint() | Generics Hands-On

In this members-only session, we take a real-world, hands-on deep dive into Java Generics by exploring how and why Java Collection utility methods use super and extends. We’ll work through practical examples using core methods such as: addAll() copy() sort() disjoint() aggregation scenarios Along the way, we’ll clearly understand: Why some methods use ? extends T Why others require ? super T Where a plain T is sufficient The producer–consumer (PECS) rule in real Java APIs What is allowed in Generics and what is not This video focuses on actual method signatures and real usage, not theoretical definitions. By the end, you should be able to read Java collection APIs with confidence and understand why they are designed this way.