Minimum Number of Operations to Convert Time LeetCode solution in Java

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class Solution {
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  public int HHMMToMinutes(String s) {
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    return Integer.parseInt(s.substring(0, 2)) * 60 + Integer.parseInt(s.substring(3, 5));
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  }
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  public int convertTime(String current, String correct) {
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    int diff = HHMMToMinutes(correct) - HHMMToMinutes(current);
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    int[] order = {60, 15, 5, 1};
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    int i = 0;
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    int ops = 0;
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    while (i < 4) {
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      ops += (diff / order[i]);
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      diff %= order[i];
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      i++;
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    }
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    return ops;
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  }
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}