Discovering the Power of Type-Safe Java Development
Start from a familiar legacy snippet: List inventory = new ArrayList();. It compiles, ships, and eventually bites back with ClassCastException. The fix is not a one‑off cast; it’s a mindset: design APIs that express intent through types and let the compiler enforce correctness.
Generics have been in Java for years, but deep fluency—wildcards, vari...
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Module 2: Wildcards & PECS - Variance and Flexible APIs
📖 Module Overview
Welcome to the most powerful aspect of Java Generics! In this module, you'll master wildcards and the PECS principle to create flexible, reusable APIs that work with families of related types. This is where generics truly shine in real-world applications.
🎯 Learning Objectives
By the end of this module, you will:
Understand covariance, contravariance, and invariance in Java
Mas...
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