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fix: validate non-empty list before sorting

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Move the empty list check before sorting to avoid processing an empty
collection and provide clearer error handling.
This commit is contained in:
zihluwang
2025-06-03 19:34:38 +08:00
parent bbc5215f84
commit 45f13a34e8
1 changed files with 2 additions and 2 deletions
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num4j/src/main/java/com/onixbyte/nums/PercentileCalculator.java
+2 -2
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@@ -72,10 +72,10 @@ public final class PercentileCalculator {
* @return a {@code Double} value representing the calculated percentile * @return a {@code Double} value representing the calculated percentile
*/ */
public static Double calculatePercentile(List<Double> values, Double percentile) { public static Double calculatePercentile(List<Double> values, Double percentile) {
var sorted = values.stream().sorted().toList(); if (values.isEmpty()) {
if (sorted.isEmpty()) {
throw new IllegalArgumentException("Unable to sort an empty list."); throw new IllegalArgumentException("Unable to sort an empty list.");
} }
var sorted = values.stream().sorted().toList();
var rank = percentile / 100. * (sorted.size() - 1); var rank = percentile / 100. * (sorted.size() - 1);
var lowerIndex = (int) Math.floor(rank); var lowerIndex = (int) Math.floor(rank);