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JavaTM 2 Platform Std. Ed. v1.3 |
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java.lang.Object | +--java.io.FileDescriptor
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.
FileInputStream,
FileOutputStream| Field Summary | |
static FileDescriptor |
err
A handle to the standard error stream. |
static FileDescriptor |
in
A handle to the standard input stream. |
static FileDescriptor |
out
A handle to the standard output stream. |
| Constructor Summary | |
FileDescriptor()
Constructs an (invalid) FileDescriptor object. |
|
| Method Summary | |
void |
sync()
Force all system buffers to synchronize with the underlying device. |
boolean |
valid()
Tests if this file descriptor object is valid. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
public static final FileDescriptor in
System.in.System.inpublic static final FileDescriptor out
System.out.System.outpublic static final FileDescriptor err
System.err.System.err| Constructor Detail |
public FileDescriptor()
| Method Detail |
public boolean valid()
true if the file descriptor object represents a
valid, open file, socket, or other active I/O connection;
false otherwise.
public void sync()
throws SyncFailedException
SyncFailedException - Thrown when the buffers cannot be flushed,
or because the system cannot guarantee that all the
buffers have been synchronized with physical media.
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JavaTM 2 Platform Std. Ed. v1.3 |
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