1. import java.util.ArrayList;
  2. import java.util.List;
  4. public class DataFilter {
  6. /**
  7. * Filters a list of data entries, ensuring backward compatibility and basic input validation.
  8. *
  9. * @param data A list of data entries (represented as Strings).
  10. * @return A new list containing only valid entries from the input list. Returns an empty list if input is null.
  11. */
  12. public static List<String> filterData(List<String> data) {
  13. if (data == null) {
  14. return new ArrayList<>(); // Handle null input gracefully
  15. }
  17. List<String> validData = new ArrayList<>();
  18. for (String entry : data) {
  19. if (entry != null && !entry.trim().isEmpty()) {
  20. // Basic validation: ensure entry is not null and not empty after trimming whitespace
  21. validData.add(entry);
  22. } else {
  23. // Skip invalid entries
  24. System.out.println("Skipping invalid entry: " + entry); // Optional: Log skipped entries
  25. }
  26. }
  27. return validData;
  28. }
  30. public static void main(String[] args) {
  31. List<String> testData = new ArrayList<>();
  32. testData.add("Valid Entry");
  33. testData.add(" "); // Empty entry with whitespace
  34. testData.add(null); // Null entry
  35. testData.add("Another Valid Entry");
  36. testData.add("Invalid Entry"); // Entry with only spaces
  37. testData.add("Valid Entry");
  38. testData.add(null);
  39. testData.add(" Valid Entry "); // Entry with leading/trailing whitespace
  41. List<String> filteredData = filterData(testData);
  42. System.out.println("Filtered Data: " + filteredData);
  43. }
  44. }

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