Java Doc for FileDescriptor.java in  » 6.0-JDK-Modules » j2me » java » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.io 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.io.FileDescriptor

FileDescriptor
final public class FileDescriptor (Code)
Instances of the file descriptor class serve as an opaque handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes. The main practical use for a file descriptor is to create a FileInputStream or FileOutputStream to contain it.

Applications should not create their own file descriptors.
version:
   1.18, 02/02/00
See Also:   java.io.FileInputStream
See Also:   java.io.FileOutputStream
since:
   JDK1.0



Field Summary
final public static  FileDescriptorerr
     A handle to the standard error stream.
final public static  FileDescriptorin
     A handle to the standard input stream.
final public static  FileDescriptorout
     A handle to the standard output stream.

Constructor Summary
public  FileDescriptor()
     Constructs an (invalid) FileDescriptor object.

Method Summary
native public  voidsync()
     Force all system buffers to synchronize with the underlying device.
public  booleanvalid()
     Tests if this file descriptor object is valid.

Field Detail
err
final public static FileDescriptor err(Code)
A handle to the standard error stream. Usually, this file descriptor is not used directly, but rather via the output stream known as System.err.
See Also:   java.lang.System.err



in
final public static FileDescriptor in(Code)
A handle to the standard input stream. Usually, this file descriptor is not used directly, but rather via the input stream known as System.in.
See Also:   java.lang.System.in



out
final public static FileDescriptor out(Code)
A handle to the standard output stream. Usually, this file descriptor is not used directly, but rather via the output stream known as System.out.
See Also:   java.lang.System.out




Constructor Detail
FileDescriptor
public FileDescriptor()(Code)
Constructs an (invalid) FileDescriptor object.




Method Detail
sync
native public void sync() throws SyncFailedException(Code)
Force all system buffers to synchronize with the underlying device. This method returns after all modified data and attributes of this FileDescriptor have been written to the relevant device(s). In particular, if this FileDescriptor refers to a physical storage medium, such as a file in a file system, sync will not return until all in-memory modified copies of buffers associated with this FileDesecriptor have been written to the physical medium. sync is meant to be used by code that requires physical storage (such as a file) to be in a known state For example, a class that provided a simple transaction facility might use sync to ensure that all changes to a file caused by a given transaction were recorded on a storage medium. sync only affects buffers downstream of this FileDescriptor. If any in-memory buffering is being done by the application (for example, by a BufferedOutputStream object), those buffers must be flushed into the FileDescriptor (for example, by invoking OutputStream.flush) before that data will be affected by sync.
exception:
  SyncFailedException - Thrown when the buffers cannot be flushed,or because the system cannot guarantee that all thebuffers have been synchronized with physical media.
since:
   JDK1.1



valid
public boolean valid()(Code)
Tests if this file descriptor object is valid. true if the file descriptor object represents avalid, open file, socket, or other active I/O connection;false otherwise.



Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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