1. import java.io.File;
  2. import java.util.ArrayList;
  3. import java.util.Collections;
  4. import java.util.Comparator;
  5. import java.util.List;
  7. class DirectoryComparator {
  9. /**
  10. * Compares two directories and validates their contents.
  11. * @param dir1 The first directory to compare.
  12. * @param dir2 The second directory to compare.
  13. * @return True if the directories are identical, false otherwise.
  14. */
  15. public static boolean compareDirectories(File dir1, File dir2) {
  16. // Check if either directory is null or invalid
  17. if (dir1 == null || dir2 == null || !dir1.exists() || !dir2.exists()) {
  18. return false;
  19. }
  21. // Check if both are directories
  22. if (!dir1.isDirectory() || !dir2.isDirectory()) {
  23. return false;
  24. }
  26. // Compare files in both directories
  27. List<String> files1 = getFiles(dir1);
  28. List<String> files2 = getFiles(dir2);
  30. // Compare the number of files
  31. if (files1.size() != files2.size()) {
  32. return false;
  33. }
  35. // Sort the file lists to ensure consistent comparison
  36. Collections.sort(files1);
  37. Collections.sort(files2);
  39. // Compare file names
  40. for (int i = 0; i < files1.size(); i++) {
  41. if (!files1.get(i).equals(files2.get(i))) {
  42. return false;
  43. }
  44. }
  46. return true;
  47. }
  49. /**
  50. * Retrieves a list of files from a directory.
  51. * @param dir The directory to retrieve files from.
  52. * @return A list of file names.
  53. */
  54. private static List<String> getFiles(File dir) {
  55. List<String> files = new ArrayList<>();
  56. File[] filesArray = dir.listFiles();
  57. if (filesArray != null) {
  58. for (File file : filesArray) {
  59. if (file.isFile()) {
  60. files.add(file.getName());
  61. }
  62. }
  63. }
  64. return files;
  65. }
  67. public static void main(String[] args) {
  68. // Example usage
  69. File dir1 = new File("dir1");
  70. File dir2 = new File("dir2");
  72. // Create sample directories and files for testing
  73. File dir3 = new File("dir3");
  74. dir3.mkdir();
  75. File file1 = new File(dir3, "file1.txt");
  76. file1.createNewFile();
  77. File file2 = new File(dir3, "file2.txt");
  78. file2.createNewFile();
  80. System.out.println("Comparing dir1 and dir3: " + compareDirectories(dir1, dir3)); // Expected: false
  81. System.out.println("Comparing dir3 and dir3: " + compareDirectories(dir3, dir3)); // Expected: true
  82. }
  83. }

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