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Java FileDescriptor

FileDescriptor class serves as an handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes. The handle can be err, in or out.

The FileDescriptor class is used to create a FileInputStream or FileOutputStream to contain it.

Field

Modifier	Type	Field	Description
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.

Constructors

Constructor	Description
FileDescriptor()	Constructs an (invalid) FileDescriptor object.

Method

Modifier and Type	Method	Description
void	sync()	It force all system buffers to synchronize with the underlying device.
boolean	valid()	It tests if this file descriptor object is valid.

Java FileDescriptor Example

import java.io.*;
public class FileDescriptorExample {
	public static void main(String[] args) {
		FileDescriptor fd = null;
		byte[] b = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58 };
		try  {
			FileOutputStream fos = new FileOutputStream("Record.txt");
			FileInputStream fis = new FileInputStream("Record.txt");
			fd = fos.getFD();
			fos.write(b);
			fos.flush();
			fd.sync();// confirms data to be written to the disk
			int value = 0;
			// for every available bytes
			while ((value = fis.read()) != -1) {
				char c = (char) value;// converts bytes to char
				System.out.print(c);
			}
			System.out.println("\nSync() successfully executed!!");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Output:

0123456789:
Sync() successfully executed!!

Record.txt:

0123456789:

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Java Tutorial

Control Statements

Java Object Class

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Java Encapsulation

Java Array

Java OOPs Misc

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Java String Methods

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Java Synchronization

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Java Serialization

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JavaFX Tutorial

JavaFX 2D Shapes

JavaFX Text

JavaFX Effects

JavaFX Transformation

JavaFX Animation

JavaFX 3D Shapes

JavaFX Layouts

JavaFX UI

JavaFX Charts

JavaFX CSS

Media with JavaFX

JavaFX Event Handling

Java Applet

Java Reflection

Java 8 Date Time

Java Date (Classical)

Java Date Format

Current Date Time

Java Conversion

Java Collections

Java JDBC

Java New Features

Java 9 Features

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Java 7 Features

Java 4/5 Features

RMI

Internationalization