Here you can find the source of clearDir(File d)
public static void clearDir(File d) throws IOException
//package com.java2s; /*//w w w . j a va 2 s .c o m * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common * Development and Distribution License ("CDDL") (collectively, the * "License"). You may not use this file except in compliance with the * License. You can obtain a copy of the License at * http://www.netbeans.org/cddl-gplv2.html. See the License for the * specific language governing permissions and limitations under the * License. When distributing the software, include this License Header * Notice in each file. This particular file is subject to the "Classpath" * exception as provided in the GPL Version 2 section of the License file * that accompanied this code. If applicable, add the following below the * License Header, with the fields enclosed by brackets [] replaced by * your own identifying information: * "Portions Copyrighted [year] [name of copyright owner]" * * The Original Software is SezPoz. The Initial Developer of the Original * Software is Sun Microsystems, Inc. Copyright 2006-2011 Oracle * Corporation. All Rights Reserved. * * If you wish your version of this file to be governed by only the CDDL * or only the GPL Version 2, indicate your decision by adding * "[Contributor] elects to include this software in this distribution * under the [CDDL or GPL Version 2] license." If you do not indicate a * single choice of license, a recipient has the option to distribute * your version of this file under either the CDDL, the GPL Version 2 or * to extend the choice of license to its licensees as provided above. * However, if you add GPL Version 2 code and therefore, elected the GPL * Version 2 license, then the option applies only if the new code is * made subject to such option by the copyright holder. */ import java.io.File; import java.io.IOException; public class Main { public static void clearDir(File d) throws IOException { File[] kids = d.listFiles(); if (kids != null) { for (File kid : kids) { if (kid.isDirectory()) { clearDir(kid); } if (!kid.delete()) { throw new IOException(kid.getAbsolutePath()); } } } } }