Directory Size

package recursion;

import java.io.File;

public class DirectorySize {

    public static void main(String[] args) {
        // Find the size of directory (sum of the sizes of all files in the directory
        // you can test the program here, I didn't write the code to test it, but it works I think
    }

    public static long getSize(File file) {
        long size = 0;
        if(file.isDirectory()) {
            File[] files = file.listFiles();
            for(int index=0; files != null && index<files.length; index++) {
                size += getSize(files[index]);
            }
        }
        else {
            size+=file.length();
        }
        return size;
    }
}