Get Equal Substrings Within Budget LeetCode solution in Java

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class Solution {
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  public int equalSubstring(String s, String t, int maxCost) {
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    int ans = 0;
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    int tempcost = 0;
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    int l = 0;
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    int r = 0;
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    for (; r != s.length(); r++) {
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      tempcost += Math.abs(s.charAt(r) - t.charAt(r));
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      while (tempcost > maxCost) {
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        tempcost -= Math.abs(s.charAt(l) - t.charAt(l));
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        l++;
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      }
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      ans = Math.max(ans, r + 1 - l);
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    }
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    return ans;
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  }
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}