Maximum Number of Consecutive Values You Can Make LeetCode solution in Java

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class Solution {
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  public int getMaximumConsecutive(int[] coins) {
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    if (coins.length == 0 && coins == null) return 0;
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    TreeMap<Integer, Integer> map = new TreeMap<Integer, Integer>();
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    for (int i : coins) map.put(i, map.getOrDefault(i, 0) + 1);
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    int range = 0;
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    for (int i : map.keySet()) {
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      if (range == 0 && i == 1) range = i * map.get(i);
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      else if (range != 0 && range + 1 >= i) range += i * map.get(i);
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      else break;
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    }
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    return range + 1;
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  }
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}