Get folder size

Question

Do you know how can I get the folder size in Java?

The length() method in the File class only works for files, using that method I always get a size of 0.

Answer 1

public class DirectorySize {
   public static void main(String[] args) {
          // Prompt the user to enter a directory or a file
          System.out.print("Please Enter a Directory or a File: ");
          Scanner input = new Scanner(System.in);
          String directory = input.nextLine();

          // Display the size
          System.out.println(getSize(new File(directory)) + " bytes");
   }

   public static long getSize(File file) {
           long size = 0; // Store the total size of all files

           if (file.isDirectory()) {
                  File[] files = file.listFiles(); // All files and subdirectories
                  for (int i = 0; i < files.length; i++) {
                         size += getSize(files[i]); // Recursive call
               }
           }
           else { // Base case
                  size += file.length();
           }

           return size;
   }

}