Here you can find the source of getRootDirectory()
public static final File getRootDirectory()
//package com.java2s; /*// w w w. j ava2 s. co m Copyright 2016 JEM 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; public class Main { private static final File root = new File(System.getProperty("user.home"), ".jemboy/"); /** * The root directory which stores the internal files for the emulator, * such as configuration files. * * @return The root directory. If it does not exist, it will be * automatically created. */ public static final File getRootDirectory() { if (!root.exists()) root.mkdir(); return root; } }