Here you can find the source of getFreeSpace(File directory)
public static long getFreeSpace(File directory)
//package com.java2s; /*//from w ww . ja v a 2 s . c o m * Copyright (C) 2015 P?RIS Quentin * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ import java.io.File; public class Main { static final long KILOBYTE = 1024L; public static long getFreeSpace(File directory) { return directory.getUsableSpace() / KILOBYTE; } public static long getFreeSpace(String directory) { return getFreeSpace(new File(directory)); } }