Java tutorial
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; /* Derby - Class org.apache.derby.iapi.util.PropertyUtil Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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. */ public class Main { /** Convert a file path into a File object with an absolute path relative to a passed in root. If path is absolute then a file object constructed from new File(path) is returned, otherwise a file object is returned from new File(root, path) if root is not null, otherwise null is returned. */ public static File getAbsoluteFile(File root, String path) { File file = new File(path); if (file.isAbsolute()) return file; if (root == null) return null; return new File(root, path); } }