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Java: What deeper point about String Immutability should a senior Java developer mention?

Difficulty:

Hard

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

What deeper point about String Immutability should a senior Java developer mention?

  1. At senior level, the right answer is that String Immutability exists mostly for historical syntax reasons.
  2. Immutability reduces defensive-copy pressure and prevents accidental cross-layer mutation, which is why String works so well as a shared value type.
  3. At senior level, the JVM removes the tradeoffs around String Immutability, so design choices barely matter.
  4. At senior level, any approach to String Immutability 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. Immutability reduces defensive-copy pressure and prevents accidental cross-layer mutation, which is why String works so well as a shared value type.

Immutability reduces defensive-copy pressure and prevents accidental cross-layer mutation, which is why String works so well as a shared value type. This is the kind of tradeoff-aware answer senior interviews usually expect.

Track: Java