Java Tech Workshop

Oct 16, 2026 · Fundamentals

Java Lambda Deep Dive: Why It's Not Anonymous Inner Class Syntactic Sugar & How invokedynamic Powers It

This article dissects Java Lambda implementation, revealing how invokedynamic and LambdaMetafactory dynamically generate hidden classes at runtime, why non-capturing lambdas are singletons, how captured variables become final field copies, and the performance implications versus anonymous inner classes.