Count Common Words With One Occurrence LeetCode solution in Java

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class Solution {
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  public int countWords(String[] words1, String[] words2) {
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    HashMap<String, Integer> map1 = new HashMap<>();
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    HashMap<String, Integer> map2 = new HashMap<>();
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    for (String word : words1) map1.put(word, map1.getOrDefault(word, 0) + 1);
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    for (String word : words2) map2.put(word, map2.getOrDefault(word, 0) + 1);
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    int count = 0;
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    for (String word : words1) if (map1.get(word) == 1 && map2.getOrDefault(word, 0) == 1) count++;
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    return count;
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  }
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}