Equal Rational Numbers LeetCode solution in Java

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class Solution {
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  private List<Double> ratios = Arrays.asList(1.0, 1.0 / 9, 1.0 / 99, 1.0 / 999, 1.0 / 9999);
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  public boolean isRationalEqual(String S, String T) {
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    return Math.abs(computeValue(S) - computeValue(T)) < 1e-9;
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  }
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  private double computeValue(String s) {
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    if (!s.contains("(")) {
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      return Double.valueOf(s);
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    } else {
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      double intNonRepeatingValue = Double.valueOf(s.substring(0, s.indexOf('(')));
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      int nonRepeatingLength = s.indexOf('(') - s.indexOf('.') - 1;
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      int repeatingLength = s.indexOf(')') - s.indexOf('(') - 1;
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      int repeatingValue = Integer.parseInt(s.substring(s.indexOf('(') + 1, s.indexOf(')')));
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      return intNonRepeatingValue
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          + repeatingValue * Math.pow(0.1, nonRepeatingLength) * ratios.get(repeatingLength);
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    }
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  }
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}