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Java: Which practice avoids a common mistake with PriorityQueue and Heap Basics?

Difficulty:

Medium

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which practice avoids a common mistake with PriorityQueue and Heap Basics?

  1. Ignore the PriorityQueue and Heap Basics issue and rely on team discipline instead of APIs or contracts.
  2. Silence the PriorityQueue and Heap Basics problem by using raw types, broad catches, or shared mutable state.
  3. Prefer the version of PriorityQueue and Heap Basics that makes behavior less predictable as long as the code compiles.
  4. Do not assume iterating a PriorityQueue returns globally sorted order, because only the head has ordering guarantees.

Hint

Look for the option that protects correctness instead of hiding the problem.

Answer and rationale

Correct answer: D. Do not assume iterating a PriorityQueue returns globally sorted order, because only the head has ordering guarantees.

Do not assume iterating a PriorityQueue returns globally sorted order, because only the head has ordering guarantees. This is a common failure mode in real Java code and a frequent interview follow-up.

Track: Java