FileDescriptor

public final class FileDescriptor extends Object

Wraps a Unix file descriptor. It's possible to get the file descriptor used by some classes (such as FileInputStream, FileOutputStream, and RandomAccessFile), and then create new streams that point to the same file descriptor.

Field Summary

public static final FileDescriptor err Corresponds to stderr.
public static final FileDescriptor in Corresponds to stdin.
public static final FileDescriptor out Corresponds to stdout.

Public Constructor Summary

FileDescriptor()
Constructs a new invalid FileDescriptor.

Public Method Summary

void
sync()
Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning.
String
toString()
Returns a string containing a concise, human-readable description of this object.
boolean
valid()
Tests whether this FileDescriptor is valid.

Inherited Method Summary

Fields

public static final FileDescriptor err

Corresponds to stderr.

public static final FileDescriptor in

Corresponds to stdin.

public static final FileDescriptor out

Corresponds to stdout.

Public Constructors

public FileDescriptor ()

Constructs a new invalid FileDescriptor.

Public Methods

public void sync ()

Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning.

public String toString ()

Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:

   getClass().getName() + '@' + Integer.toHexString(hashCode())

See Writing a useful toString method if you intend implementing your own toString method.

Returns
  • a printable representation of this object.

public boolean valid ()

Tests whether this FileDescriptor is valid.