Number of Substrings With Only 1s LeetCode solution in Java

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class Solution {
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  public int numSub(String s) {
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    char[] ch = s.toCharArray();
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    long count = 0;
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    long result = 0;
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    for (int i = 0; i < ch.length; i++) {
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      if (ch[i] == '1') {
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        count++;
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        result += count;
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      } else {
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        count = 0;
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      }
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    }
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    return (int) (result % 1000000007);
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  }
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}