Measure the size of a folder in Java

javac foldersize.java
java foldersize folder path

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class foldersize {
    public static void main(String args[]) {
        String targetdir;
        if (args.length == 0) {
            targetdir = ".";
        } else {
            targetdir = args[0];
        }
        System.out.println("["+targetdir+"]"+fileSize(targetdir)+"B");

    }

    public static long fileSize(String path) {
        Path folder = Paths.get(path);
        long size = 0;
        try {
            size =  Files.walk(folder)
            .map(Path::toFile)
            .filter(f -> f.isFile())
            .mapToLong(f -> f.length())
            .sum();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return size;
    }


}

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