Lessons
Java · Medium
Java · Medium. Ten lessons. Open-book quizzes. Lesson 1 free.
10 lessons · The Host · Lesson 1 free
Pass all ten lessons for the certificate. Sample · Claim
Lesson 1 · On the house
Generics deeper
Bounds and wildcards.
Lesson 2
Optional
Presence without null.
Lesson 3
CompletableFuture sketch
Async composition.
Lesson 4
try-with-resources
AutoCloseable cleanup.
Lesson 5
Modules sketch
module-info.java.
Lesson 6
Concurrency basics
synchronized and concurrent collections.
Lesson 7
Streams deeper
Collectors and grouping.
Lesson 8
Localization sketch
Locale and formatting.
Lesson 9
Profiling sketch
Measure hotspots.
Lesson 10
Medium capstone
Record + List + Optional.
Sample certificate
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Certificate
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