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Java: What deeper point about Generics and Wildcards should a senior Java developer mention?

Difficulty:

Hard

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

What deeper point about Generics and Wildcards should a senior Java developer mention?

  1. At senior level, the right answer is that Generics and Wildcards exists mostly for historical syntax reasons.
  2. The PECS rule matters because variance decisions decide whether a generic API is flexible, safe, and readable.
  3. At senior level, the JVM removes the tradeoffs around Generics and Wildcards, so design choices barely matter.
  4. At senior level, any approach to Generics and Wildcards is equally correct if it compiles and passes a small test.

Hint

Look beyond syntax and explain the runtime, API, or design consequence.

Answer and rationale

Correct answer: B. The PECS rule matters because variance decisions decide whether a generic API is flexible, safe, and readable.

The PECS rule matters because variance decisions decide whether a generic API is flexible, safe, and readable. This is the kind of tradeoff-aware answer senior interviews usually expect.

Track: Java