Study 1Z0-829 Java 17 Streams and Optional: key concepts, common traps, and exam decision cues.
This is one of the biggest scoring lanes. Streams combine type inference, collector contracts, ordering, laziness, and optional handling into one area where intuition often fails.
| Lesson | Focus |
|---|---|
| 7.1 Collectors and Optional | Learn how the exam tests stream stages, collectors, Optional behavior, and safe parallel use. |
| If the question is really about… | Go first to… |
|---|---|
| lambda-driven stream behavior | 7.1 Collectors and Optional |
| terminal operations or stream reuse | 7.1 Collectors and Optional |
Optional behavior or parallel safety |
7.1 Collectors and Optional |