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Java: Which practice avoids a common mistake with Generics and Wildcards?

Difficulty:

Medium

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which practice avoids a common mistake with Generics and Wildcards?

  1. Do not use raw types because they hide type mismatches until runtime and weaken the API contract.
  2. Ignore the Generics and Wildcards issue and rely on team discipline instead of APIs or contracts.
  3. Silence the Generics and Wildcards problem by using raw types, broad catches, or shared mutable state.
  4. Prefer the version of Generics and Wildcards that makes behavior less predictable as long as the code compiles.

Hint

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

Answer and rationale

Correct answer: A. Do not use raw types because they hide type mismatches until runtime and weaken the API contract.

Do not use raw types because they hide type mismatches until runtime and weaken the API contract. This is a common failure mode in real Java code and a frequent interview follow-up.

Track: Java