Package java.io

Class FileReader

java.lang.Object

java.io.Reader

java.io.InputStreamReader

java.io.FileReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class FileReader
extends InputStreamReader

A specialized 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 Also:

BufferedReader, FileWriter

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor	Description
FileReader(File file)	Constructs a new FileReader on the given file.
FileReader(FileDescriptor fd)	Construct a new FileReader on the given FileDescriptor fd.
FileReader(String filename)	Construct a new FileReader on the given file named filename.

Method Summary

Methods inherited from class java.io.InputStreamReader

close, getEncoding, read, read, ready

Methods inherited from class java.io.Reader

mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileReader

public FileReader(File file)
           throws FileNotFoundException

Constructs a new FileReader on the given file.

Parameters:

file - a File to be opened for reading characters from.

Throws:

FileNotFoundException - if file does not exist.

FileReader

public FileReader(FileDescriptor fd)

Construct a new FileReader on the given FileDescriptor fd. Since a previously opened FileDescriptor is passed as an argument, no FileNotFoundException can be thrown.

Parameters:

fd - the previously opened file descriptor.

FileReader

public FileReader(String filename)
           throws FileNotFoundException

Construct a new FileReader on the given file named filename.

Parameters:

filename - an absolute or relative path specifying the file to open.

Throws:

FileNotFoundException - if there is no file named filename.