First Bad Version LeetCode solution in Java

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/* The isBadVersion API is defined in the parent class VersionControl.
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boolean isBadVersion(int version); */
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public class Solution extends VersionControl {
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  public int firstBadVersion(int n) {
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    int s = 0;
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    int e = n;
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    while (s < e) {
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      int mid = s + (e - s) / 2;
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      if (isBadVersion(mid)) {
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        e = mid;
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      } else {
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        s = mid + 1;
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      }
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    }
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    return e;
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  }
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}