Unit 4 Cycle 2 Day 6: ArrayList Wrapper Types
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Unit 4, Data Collections • Cycle 2
Day 6 Advanced Practice • Harder Difficulty
Focus: ArrayList Wrapper Types
Hard
ArrayList Wrapper Types
Advanced Practice Question
Format: ArrayList Wrapper Types
What happens when you compile this code?
What happens when you compile this code?
ArrayList nums = new ArrayList();
Difficulty: Hard |
Topic: ArrayList Wrapper Types |
Cycle: 2 (Advanced)
Why This Answer?
ArrayLists require wrapper classes (Integer, Double, Boolean), not primitives (int, double, boolean). Must use ArrayList
Common Mistake
Watch Out!
Forgetting that ArrayList can't use primitive types.
AP Exam Strategy
ArrayLists need wrapper classes: Integer not int, Double not double, Boolean not boolean.
Master This Topic
This Cycle 2 HARD question tests arraylist wrapper types. Review Unit 4 concepts to build mastery of data collections.
- Understanding arraylist wrapper types
- Tracing code execution accurately
- Avoiding common pitfalls
Ready for More Challenges?
Cycle 2 questions prepare you for the hardest AP CSA exam questions.
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