1. import java.io.File;
  2. import java.io.FileInputStream;
  3. import java.io.IOException;
  5. public class FilePerformance {
  7. public static void main(String[] args) {
  8. // Example usage: Replace with your file path
  9. String filePath = "test.txt";
  11. long startTime = System.currentTimeMillis();
  12. long fileSize = getFileSize(filePath);
  13. long endTime = System.currentTimeMillis();
  14. System.out.println("File size: " + fileSize + " bytes");
  15. System.out.println("Time to get file size: " + (endTime - startTime) + " ms");
  17. startTime = System.currentTimeMillis();
  18. try {
  19. readWholeFile(filePath);
  20. } catch (IOException e) {
  21. System.err.println("Error reading file: " + e.getMessage());
  22. }
  23. endTime = System.currentTimeMillis();
  24. System.out.println("Time to read whole file: " + (endTime - startTime) + " ms");
  25. }
  27. private static long getFileSize(String filePath) throws IOException {
  28. File file = new File(filePath);
  29. return file.length();
  30. }
  32. private static void readWholeFile(String filePath) throws IOException {
  33. FileInputStream fileInputStream = null;
  34. try {
  35. fileInputStream = new FileInputStream(filePath);
  36. byte[] fileContent = fileInputStream.readAllBytes(); // Read entire file content
  37. // Process fileContent here (e.g., analyze, validate)
  38. // For this example, we just read it.
  39. } finally {
  40. if (fileInputStream != null) {
  41. fileInputStream.close(); // Ensure file stream is closed
  42. }
  43. }
  44. }
  45. }

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