Java.io.RandomAccessFile.getFD() Method

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Description

The java.io.RandomAccessFile.getFD() method returns the opaque file descriptor object associated with this stream.

Declaration

Following is the declaration for java.io.RandomAccessFile.getFD() method.

public final FileDescriptor getFD()

Parameters

NA

Return Value

This method returns the file descriptor object associated with this stream.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.RandomAccessFile.getFD() method.

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {
   public static void main(String[] args) {
   
      try {
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write something in the file
         raf.writeUTF("Hello World");

         // set the file pointer at 0 position
         raf.seek(0);

         // read and print the contents of the file
         System.out.println("" + raf.readUTF());

         // return the file descriptor of the stream
         System.out.println("" + raf.getFD());

         // close the strea and release resources
         raf.close();
      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program −

ABCDE  

Let us compile and run the above program, this will produce the following result −

Hello World
java.io.FileDescriptor@152b6651