Module java.base

Package java.io

Class FileWriter

java.lang.Object

java.io.Writer

java.io.OutputStreamWriter

java.io.FileWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class FileWriter
extends OutputStreamWriter

Convenience class for writing character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.

Whether or not a file is available or may be created depends upon the underlying platform. Some platforms, in particular, allow a file to be opened for writing by only one FileWriter (or other file-writing object) at a time. In such situations the constructors in this class will fail if the file involved is already open.

FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream.

Since:

1.1

See Also:

OutputStreamWriter, FileOutputStream

Field Summary

Fields declared in class java.io.Writer

lock

Constructor Summary

Constructors

Constructor	Description
FileWriter(File file)	Constructs a FileWriter object given a File object.
FileWriter(FileDescriptor fd)	Constructs a FileWriter object associated with a file descriptor.
FileWriter(File file, boolean append)	Constructs a FileWriter object given a File object.
FileWriter(String fileName)	Constructs a FileWriter object given a file name.
FileWriter(String fileName, boolean append)	Constructs a FileWriter object given a file name with a boolean indicating whether or not to append the data written.

Method Summary

Methods declared in class java.lang.Object

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

Methods declared in class java.io.OutputStreamWriter

flush, getEncoding, write, write, write

Methods declared in class java.io.Writer

append, append, append, close, write, write

Constructor Detail

FileWriter

public FileWriter(String fileName)
           throws IOException

Constructs a FileWriter object given a file name.

Parameters:

fileName - String The system-dependent filename.

Throws:

IOException - if the named file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason

FileWriter

public FileWriter(String fileName,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a file name with a boolean indicating whether or not to append the data written.

Parameters:

fileName - String The system-dependent filename.

append - boolean if true, then data will be written to the end of the file rather than the beginning.

Throws:

IOException - if the named file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason

FileWriter

public FileWriter(File file)
           throws IOException

Constructs a FileWriter object given a File object.

Parameters:

file - a File object to write to.

Throws:

IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason

FileWriter

public FileWriter(File file,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

Parameters:

file - a File object to write to

append - if true, then bytes will be written to the end of the file rather than the beginning

Throws:

IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason

Since:

1.4

FileWriter

public FileWriter(FileDescriptor fd)

Constructs a FileWriter object associated with a file descriptor.

Parameters:

fd - FileDescriptor object to write to.