| /* |
| * 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. |
| */ |
| |
| package java.io; |
| |
| /** |
| * A specialized {@link Reader} that reads from a file in the file system. |
| * All read requests made by calling methods in this class are directly |
| * forwarded to the equivalent function of the underlying operating system. |
| * Since this may induce some performance penalty, in particular if many small |
| * read requests are made, a FileReader is often wrapped by a |
| * BufferedReader. |
| * |
| * @see BufferedReader |
| * @see FileWriter |
| */ |
| public class FileReader extends InputStreamReader { |
| |
| /** |
| * Constructs a new FileReader on the given {@code file}. |
| * |
| * @param file |
| * a File to be opened for reading characters from. |
| * @throws FileNotFoundException |
| * if {@code file} does not exist. |
| */ |
| public FileReader(File file) throws FileNotFoundException { |
| super(new FileInputStream(file)); |
| } |
| |
| /** |
| * Construct a new FileReader on the given FileDescriptor {@code fd}. Since |
| * a previously opened FileDescriptor is passed as an argument, no |
| * FileNotFoundException can be thrown. |
| * |
| * @param fd |
| * the previously opened file descriptor. |
| */ |
| public FileReader(FileDescriptor fd) { |
| super(new FileInputStream(fd)); |
| } |
| |
| /** |
| * Construct a new FileReader on the given file named {@code filename}. |
| * |
| * @param filename |
| * an absolute or relative path specifying the file to open. |
| * @throws FileNotFoundException |
| * if there is no file named {@code filename}. |
| */ |
| public FileReader(String filename) throws FileNotFoundException { |
| super(new FileInputStream(filename)); |
| } |
| } |