AP CSA Unit 4 Day 28: Arraylist Equality
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Unit 4, Data Collections • Cycle 2
Day 28 Advanced Practice • Harder Difficulty
Focus: ArrayList Equality
Hard
ArrayList Equality
Advanced Practice Question
Format: ArrayList Equality
What is the output?
What is the output?
ArrayList a = new ArrayList<>();
a.add(1);
a.add(2);
ArrayList b = new ArrayList<>();
b.add(1);
b.add(2);
System.out.println(a == b);
System.out.println(a.equals(b));
Difficulty: Hard |
Topic: ArrayList Equality |
Cycle: 2 (Advanced)
Why This Answer?
== compares references (different objects = false). equals() for ArrayList compares contents element-by-element (same contents = true).
Common Mistake
Watch Out!
Thinking == checks contents for ArrayLists.
AP Exam Strategy
For ArrayLists: == checks references, equals() checks contents.
Master This Topic
This Cycle 2 HARD question tests arraylist equality. Review Unit 4 concepts to build mastery of data collections.
- Understanding arraylist equality
- 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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