Integer map boxing on primitives
Review this Java method that counts occurrences of each integer key in a high-volume stream of events.
What a strong answer looks like
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0:00 of about 22 min
Mark a line and say what kind of problem it is.0 findings
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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