1. import java.time.Duration;
  2. import java.time.LocalDateTime;
  3. import java.util.ArrayList;
  4. import java.util.List;
  6. public class TimeAnomalyDetector {
  8. /**
  9. * Detects anomalies in a list of LocalDateTime values.
  10. *
  11. * @param timestamps A list of LocalDateTime timestamps.
  12. * @param anomalyThresholdDuration The duration (in minutes) considered anomalous.
  13. * @return A list of LocalDateTime timestamps flagged as anomalies.
  14. */
  15. public static List<LocalDateTime> detectAnomalies(List<LocalDateTime> timestamps, long anomalyThresholdDuration) {
  16. List<LocalDateTime> anomalies = new ArrayList<>();
  18. if (timestamps == null || timestamps.size() < 2) {
  19. return anomalies; // Not enough data to detect anomalies
  20. }
  22. for (int i = 1; i < timestamps.size(); i++) {
  23. LocalDateTime prevTimestamp = timestamps.get(i - 1);
  24. LocalDateTime currentTimestamp = timestamps.get(i);
  26. Duration duration = Duration.between(prevTimestamp, currentTimestamp);
  28. if (duration.toMinutes() > anomalyThresholdDuration) {
  29. anomalies.add(currentTimestamp); // Flag as anomaly
  30. }
  31. }
  33. return anomalies;
  34. }
  36. public static void main(String[] args) {
  37. // Example Usage
  38. List<LocalDateTime> timestamps = new ArrayList<>();
  39. timestamps.add(LocalDateTime.now().minusHours(2));
  40. timestamps.add(LocalDateTime.now().minusHours(1));
  41. timestamps.add(LocalDateTime.now());
  42. timestamps.add(LocalDateTime.now().plusHours(2));
  43. timestamps.add(LocalDateTime.now().plusHours(3));
  44. timestamps.add(LocalDateTime.now().plusHours(4));
  48. long anomalyThreshold = 2; // minutes
  50. List<LocalDateTime> anomalies = detectAnomalies(timestamps, anomalyThreshold);
  52. if (anomalies.isEmpty()) {
  53. System.out.println("No anomalies detected.");
  54. } else {
  55. System.out.println("Anomalies detected:");
  56. for (LocalDateTime anomaly : anomalies) {
  57. System.out.println(anomaly);
  58. }
  59. }
  60. }
  61. }

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