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Java Platform 1.2
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Class java.io.FileOutputStream

java.lang.Object
  |
  +--java.io.OutputStream
        |
        +--java.io.FileOutputStream

public class FileOutputStream

extends OutputStream

A file output stream is an output stream for writing data to a File or to a FileDescriptor. What files are available or may be created depends on the host environment.

Since:

JDK1.0

See Also:

File, FileDescriptor, FileInputStream

Constructor Summary

FileOutputStream(File file)
Creates a file output stream to write to the file represented by the specified File object.

FileOutputStream(FileDescriptor fdObj)
Creates an output file stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.

FileOutputStream(String name, boolean append)
Creates an output file with the specified system dependent file name.

FileOutputStream(String name)
Creates an output file stream to write to the file with the specified name.

Method Summary

void	close() Closes this file output stream and releases any system resources associated with this stream.
protected void	finalize() Cleans up the connection to the file, and ensures that the close method of this file output stream is called when there are no more references to this stream.
FileDescriptor	getFD() Returns the file descriptor associated with this stream.
void	write(byte[] b, int off, int len) Writes len bytes from the specified byte array starting at offset off to this file output stream.
void	write(byte[] b) Writes b.length bytes from the specified byte array to this file output stream.
void	write(int b) Writes the specified byte to this file output stream.

Methods inherited from class java.io.OutputStream

flush

Methods inherited from class java.lang.Object

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

Constructor Detail

FileOutputStream

public FileOutputStream(String name)
                 throws IOException

Creates an output file stream to write to the file with the specified name. A new FileDescriptor object is created to represent this file connection.

First, if there is a security manager, its checkWrite method is called with name as its argument.

If the file cannot be opened, a FileNotFoundException is thrown.

Parameters:

name - the system-dependent filename.

Throws:

IOException - if the file could not be opened for writing.

SecurityException - if a security manager exists, its checkWrite method is called with the name argument to see if the application is allowed write access to the file.

See Also:

SecurityManager.checkWrite(java.lang.String)

FileOutputStream

public FileOutputStream(String name,
                        boolean append)
                 throws IOException

Creates an output file with the specified system dependent file name.

Parameters:

name - the system dependent file name

Throws:

IOException - If the file is not found.

Since:

JDK1.1

FileOutputStream

public FileOutputStream(File file)
                 throws IOException

Creates a file output stream to write to the file represented by the specified File object. A new FileDescriptor object is created to represent this file connection.

First, if there is a security manager, its checkWrite method is called with the path represented by the file argument as its argument.

if the file cannot be opened, a FileNotFoundException is thrown.

Parameters:

file - the file to be opened for writing.

Throws:

IOException - if the file could not be opened for writing.

SecurityException - if a security manager exists, its checkWrite method is called with the pathname of the File argument to see if the application is allowed write access to the file. This may result in a security exception.

See Also:

File.getPath(), SecurityException, SecurityManager.checkWrite(java.lang.String)

FileOutputStream

public FileOutputStream(FileDescriptor fdObj)

Creates an output file stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.

First, if there is a security manager, its checkWrite method is called with the file descriptor fdObj argument as its argument.

Parameters:

fdObj - the file descriptor to be opened for writing.

Throws:

SecurityException - if a security manager exists, its checkWrite method is called with the file descriptor to see if the application is allowed to write to the specified file descriptor.

See Also:

SecurityManager.checkWrite(java.io.FileDescriptor)

Method Detail

write

public void write(int b)
           throws IOException

Writes the specified byte to this file output stream. Implements the write method of OutputStream.

Parameters:

b - the byte to be written.

Throws:

IOException - if an I/O error occurs.

Overrides:

write in class OutputStream

write

public void write(byte[] b)
           throws IOException

Writes b.length bytes from the specified byte array to this file output stream.

Parameters:

b - the data.

Throws:

IOException - if an I/O error occurs.

Overrides:

write in class OutputStream

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Writes len bytes from the specified byte array starting at offset off to this file output stream.

Parameters:

b - the data.

off - the start offset in the data.

len - the number of bytes to write.

Throws:

IOException - if an I/O error occurs.

Overrides:

write in class OutputStream

close

public void close()
           throws IOException

Closes this file output stream and releases any system resources associated with this stream. This file output stream may no longer be used for writing bytes.

Throws:

IOException - if an I/O error occurs.

Overrides:

close in class OutputStream

getFD

public final FileDescriptor getFD()
                           throws IOException

Returns the file descriptor associated with this stream.

Returns:

the FileDescriptor object that represents the connection to the file in the file system being used by this FileOutputStream object.

Throws:

IOException - if an I/O error occurs.

See Also:

FileDescriptor

finalize

protected void finalize()
                 throws IOException

Cleans up the connection to the file, and ensures that the close method of this file output stream is called when there are no more references to this stream.

Throws:

IOException - if an I/O error occurs.

Overrides:

finalize in class Object

See Also:

FileInputStream.close()