1. import java.util.ArrayList;
  2. import java.util.HashMap;
  3. import java.util.List;
  4. import java.util.Map;
  6. public class StringDatasetMerger {
  8. /**
  9. * Merges multiple datasets of strings into a single dataset, counting occurrences.
  10. * @param datasets A list of datasets, where each dataset is a list of strings.
  11. * @return A map where keys are strings and values are their total counts.
  12. */
  13. public static Map<String, Integer> mergeDatasets(List<List<String>> datasets) {
  15. Map<String, Integer> mergedDataset = new HashMap<>(); // Initialize an empty map to store the merged data
  17. if (datasets == null || datasets.isEmpty()) {
  18. return mergedDataset; // Return empty map if input is null or empty
  19. }
  21. for (List<String> dataset : datasets) { // Iterate through each dataset in the input list
  22. if (dataset != null) {
  23. for (String str : dataset) { // Iterate through each string in the current dataset
  24. if (str != null) { //Handle null strings
  25. mergedDataset.put(str, mergedDataset.getOrDefault(str, 0) + 1); // Increment count for the string
  26. }
  27. }
  28. }
  29. }
  31. return mergedDataset; // Return the merged dataset
  32. }
  34. public static void main(String[] args) {
  35. // Example Usage
  36. List<List<String>> datasets = new ArrayList<>();
  37. List<String> dataset1 = List.of("apple", "banana", "apple");
  38. List<String> dataset2 = List.of("banana", "orange", "apple");
  39. List<String> dataset3 = List.of("grape", "apple");
  41. datasets.add(dataset1);
  42. datasets.add(dataset2);
  43. datasets.add(dataset3);
  45. Map<String, Integer> mergedData = mergeDatasets(datasets);
  47. System.out.println(mergedData); // Output the merged data
  48. }
  49. }

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