Divide Array Into Equal Pairs LeetCode solution in Java

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class Solution {
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  public boolean divideArray(int[] arr) {
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    HashMap<Integer, Integer> map = new HashMap<>();
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    for (int i : arr) map.put(i, map.getOrDefault(i, 0) + 1);
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    for (int i : map.keySet()) {
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      if (map.get(i) % 2 != 0) return false;
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    }
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    return true;
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  }
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}