Module 06 · Streams & Lambdas

Objective group 6: functional Java — lambdas and functional interfaces, the Stream pipeline, reduction and Collectors, and Optional/primitive streams. The exam tests laziness, single-use streams, Collectors, and the orElse/orElseGet distinction.

Lessons

#	Lesson	What it covers
01	Lambdas & Functional Interfaces	Syntax, java.util.function, method references, capture.
02	Streams Basics	Creation, intermediate vs terminal, laziness, core operations.
03	Reduction & Collectors	reduce, collect, grouping/partitioning, downstream collectors.
04	Optional & Primitive Streams	Optional API, IntStream/…, summary statistics.

Track your progress

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• L01 — Lambdas & Functional Interfaces
• L02 — Streams Basics
• L03 — Reduction & Collectors
• L04 — Optional & Primitive Streams

Module Mini-Exam

A timed, mixed quiz covering the whole module. Aim well above the real exam's 68% pass bar.

Mini-Exam

• 8 questions
• 20 minutes
• 9 total points
• Pass: 7 pts (68%)