Here you can find the source of mkdirs(File file)
public static void mkdirs(File file) throws IOException
//package com.java2s; /*/*from w w w . j a va2 s . c om*/ * Copyright 2010-2013 JetBrains s.r.o. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.File; import java.io.IOException; public class Main { public static void mkdirs(File file) throws IOException { if (file.isDirectory()) { return; } if (!file.mkdirs()) { if (file.exists()) { throw new IOException("failed to create " + file + " file exists and not a directory"); } throw new IOException(); } } }