Module 07 · Concurrency

Objective group 9: running code concurrently — Runnable/Callable and Future, the ExecutorService and java.util.concurrent toolkit, CompletableFuture composition, and Java 21 virtual threads. The exam favors conceptual traps (start vs run, atomicity vs visibility, thenApply vs thenCompose).

Lessons

#	Lesson	What it covers
01	Threads & Tasks	Runnable/Callable, Thread, lifecycle states, Future.
02	Executors & Concurrent Utilities	ExecutorService, pools, concurrent collections, atomics, visibility.
03	CompletableFuture	supplyAsync, compose/combine, exception handling.
04	Virtual Threads	Platform vs virtual, per-task executor (Java 21).

Track your progress

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• L01 — Threads & Tasks
• L02 — Executors & Concurrent Utilities
• L03 — CompletableFuture
• L04 — Virtual Threads

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%)