Code reviewHardcr-g300

Subject Boxing overheadLevel Senior–Staff~22 minCommon in Code quality & review interviewsIndustries Software development

Question

Review this Java method that counts occurrences of each integer key in a high-volume stream of events.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.

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Talk through your review

Code to reviewjava

1Map<Integer, Integer> countKeys(int[] keys) {2    Map<Integer, Integer> counts = new HashMap<>();3    for (int k : keys) {4        Integer cur = counts.get(k);5        counts.put(k, cur == null ? 1 : cur + 1);6    }7    return counts;8}

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