Java tutorial
//package com.java2s; //License from project: Apache License import java.io.File; public class Main { public static long getFileSize(File f) { long size = 0; File files[] = f.listFiles(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { size = size + getFileSize(files[i]); } else { size = size + files[i].length(); } } return size; } }