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
Writes text to character files using a default buffer size. Encoding from characters to bytes uses either a specified charset or the platform's default charset.

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.

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

Since:
1.1
See Also:

Field Summary

Fields declared in class java.io.Writer

lock

Constructor Summary

Constructor Description
FileWriter(File file)
Constructs a FileWriter given the File to write, using the platform's default charset
FileWriter(FileDescriptor fd)
Constructs a FileWriter given a file descriptor, using the platform's default charset.
FileWriter(File file, boolean append)
Constructs a FileWriter given the File to write and a boolean indicating whether to append the data written, using the platform's default charset.
FileWriter(File file, Charset charset)
Constructs a FileWriter given the File to write and charset.
FileWriter(File file, Charset charset, boolean append)
Constructs a FileWriter given the File to write, charset and a boolean indicating whether to append the data written.
FileWriter(String fileName)
Constructs a FileWriter given a file name, using the platform's default charset
FileWriter(String fileName, boolean append)
Constructs a FileWriter given a file name and a boolean indicating whether to append the data written, using the platform's default charset.
FileWriter(String fileName, Charset charset)
Constructs a FileWriter given a file name and charset.
FileWriter(String fileName, Charset charset, boolean append)
Constructs a FileWriter given a file name, charset and a boolean indicating whether to append the data written.

Method Summary

Methods declared in class java.io.OutputStreamWriter

close, flush, getEncoding, write, write, write

Methods declared in class java.io.Writer

append, append, append, nullWriter, write, write

Methods declared in class java.lang.Object

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

Constructor Details

FileWriter

public FileWriter(String fileName) throws IOException
Constructs a FileWriter given a file name, using the platform's default charset
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 given a file name and a boolean indicating whether to append the data written, using the platform's default charset.
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 given the File to write, using the platform's default charset
Parameters:
file - the File to write.
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 given the File to write and a boolean indicating whether to append the data written, using the platform's default charset.
Parameters:
file - the File to write
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 given a file descriptor, using the platform's default charset.
Parameters:
fd - the FileDescriptor to write.

FileWriter

public FileWriter(String fileName, Charset charset) throws IOException
Constructs a FileWriter given a file name and charset.
Parameters:
fileName - the name of the file to write
charset - the charset
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
Since:
11

FileWriter

public FileWriter(String fileName, Charset charset, boolean append) throws IOException
Constructs a FileWriter given a file name, charset and a boolean indicating whether to append the data written.
Parameters:
fileName - the name of the file to write
charset - the charset
append - a boolean. If true, the writer will write the data 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
Since:
11

FileWriter

public FileWriter(File file, Charset charset) throws IOException
Constructs a FileWriter given the File to write and charset.
Parameters:
file - the File to write
charset - the charset
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:
11

FileWriter

public FileWriter(File file, Charset charset, boolean append) throws IOException
Constructs a FileWriter given the File to write, charset and a boolean indicating whether to append the data written.
Parameters:
file - the File to write
charset - the charset
append - a boolean. If true, the writer will write the data 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:
11

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/FileWriter.html