FileReader

AI-generated Key Takeaways

• FileReader is a convenience class in Java for reading character files using the default encoding and buffer size.

• It provides constructors to create a reader from a file name, a File object, or a FileDescriptor.

• For reading raw bytes instead of characters, use FileInputStream.

• FileReader inherits methods from InputStreamReader and Reader for operations like reading, closing, and checking stream status.

public class FileReader extends InputStreamReader

Convenience class for reading character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are appropriate. To specify these values yourself, construct an InputStreamReader on a FileInputStream.

FileReader is meant for reading streams of characters. For reading streams of raw bytes, consider using a FileInputStream.

See Also

• InputStreamReader
• FileInputStream

Inherited Field Summary

From class java.io.Reader

protected Object

lock

The object used to synchronize operations on this stream.

Public Constructor Summary

	FileReader(String fileName) Creates a new FileReader, given the name of the file to read from.
	FileReader(File file) Creates a new FileReader, given the File to read from.
	FileReader(FileDescriptor fd) Creates a new FileReader, given the FileDescriptor to read from.

Inherited Method Summary

From class java.io.InputStreamReader

void	close() Closes the stream and releases any system resources associated with it.
String	getEncoding() Returns the name of the character encoding being used by this stream.
int	read() Reads a single character.
int	read(char[] cbuf, int offset, int length) Reads characters into a portion of an array.
boolean	ready() Tells whether this stream is ready to be read.

From class java.io.Reader

abstract void	close() Closes the stream and releases any system resources associated with it.
void	mark(int readAheadLimit) Marks the present position in the stream.
boolean	markSupported() Tells whether this stream supports the mark() operation.
int	read() Reads a single character.
abstract int	read(char[] cbuf, int off, int len) Reads characters into a portion of an array.
int	read(char[] cbuf) Reads characters into an array.
int	read(CharBuffer target) Attempts to read characters into the specified character buffer.
boolean	ready() Tells whether this stream is ready to be read.
void	reset() Resets the stream.
long	skip(long n) Skips characters.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

From interface java.lang.Readable

abstract int

read(CharBuffer cb) Attempts to read characters into the specified character buffer.

From interface java.io.Closeable

abstract void

close() Closes this stream and releases any system resources associated with it.

From interface java.lang.AutoCloseable

abstract void

close() Closes this resource, relinquishing any underlying resources.

Public Constructors

public FileReader (String fileName)

Creates a new FileReader, given the name of the file to read from.

Parameters

fileName	the name of the file to read from

Throws

FileNotFoundException	if the named file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading.

public FileReader (File file)

Creates a new FileReader, given the File to read from.

Parameters

file	the File to read from

Throws

FileNotFoundException	if the file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading.

public FileReader (FileDescriptor fd)

Creates a new FileReader, given the FileDescriptor to read from.

Parameters

fd	the FileDescriptor to read from