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
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:
OutputStreamWriter, FileOutputStream

  • 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