Question
You ask an AI to explain this Java cache so you can extend it. The agent says: "It's a thread-safe lazy-loading cache — ConcurrentHashMap guarantees that even under concurrent access, compute() runs at most once per key." You're about to add an expensive remote call inside compute(). Is the explanation correct, and how would you verify before relying on the at-most-once claim?
private final Map<String, Value> cache = new ConcurrentHashMap<>();Value get(String key) { if (!cache.containsKey(key)) { cache.put(key, compute(key)); } return cache.get(key);}Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.