Study 1Z0-830 Java 21 Generics: key concepts, common traps, and exam decision cues.
Generics are where many candidates start hand-waving. That is exactly what the exam punishes. Generics questions reward precise legality, not approximate intuition.
| Lesson | Focus |
|---|---|
| 9.1 Bounds and Wildcards | Learn how the exam tests generic legality, wildcard direction, and runtime erasure limits. |
| If the question is really about… | Go first to… |
|---|---|
| type parameter legality or generic methods | 9.1 Bounds and Wildcards |
extends and super wildcard direction |
9.1 Bounds and Wildcards |
| runtime generic limits | 9.1 Bounds and Wildcards |