Here you can find the source of makeDir(String dir)
public static boolean makeDir(String dir)
//package com.java2s; /**//from w w w . j a v a2 s . c o m * AlphaMale for web Copyright (C) 2016 NHN Technology Services 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 { public static boolean makeDir(String dir) { if (new File(dir).exists() && new File(dir).isDirectory()) return true; else return new File(dir).mkdir(); } }