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4.1 Lambda Syntax, Scope & Effectively Final Capture
Topic Summary
Understand lambda desugaring with invokedynamic, lexical scoping, and why captured local variables must be effectively final.
What You Will Learn
• Write concise lambda expressions: `(params) -> body`.
• Understand the `@FunctionalInterface` contract (exactly 1 abstract method).
• Explain why captured local variables must be effectively final.
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