Study 1Z0-830 Java 21 Arrays and Collections: key concepts, common traps, and exam decision cues.
This chapter is where Java intuition often becomes wrong. The exam keeps asking whether a collection is mutable, ordered, fixed-size, sequenced, sorted, or only apparently familiar.
| Lesson | Focus |
|---|---|
| 8.1 Collections and Mutability | Learn how the exam tests list, set, map, deque, ordering, and factory-method behavior. |
| If the question is really about… | Go first to… |
|---|---|
| list vs set vs map vs deque behavior | 8.1 Collections and Mutability |
| sorting, encounter order, or first and last operations | 8.1 Collections and Mutability |
List.of, Arrays.asList, wrappers, or mutability |
8.1 Collections and Mutability |