Correct wrong value

[kang-hl]

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Which Issue(s) This PR Fixes

Fixes #issue_id

Brief Description

How Did You Test This Change?

[joeCarf]

please start an issue and describe it

[kang-hl]

please start an issue and describe it

for (String s : list) {
  countMap.compute(s, (k, count) -> count == null ? 1 : count + 1); // not 0
}

for (String s : list) {
  Integer count = countMap.get(s);
  if (count == null) {
    count = 1; // not 0
  } else {
    count += 1;
  }
  countMap.put(s, count);
}

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