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Java FileInputStream getFD() Method with Example

FileInputStream Class getFD() method: Here, we are going to learn about the getFD() method of FileInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 01, 2020

FileInputStream Class getFD() method

• getFD() method is available in java.io package.
• getFD() method is used to return the FileDescriptor object that denotes the connection to the exact file in the file system being used by this FileInputStream.
• getFD() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• getFD() method does not throw an exception at the time of getting a file descriptor.

Syntax:

    public FileDescriptor getFD();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is FileDescriptor, it returns the same FileDescriptor object linked with this stream.

Example:

// Java program to demonstrate the example 
// of FileDescriptor getFD() method 
// of FileInputStream

import java.io.*;

public class GetFDOfFIS {
 public static void main(String[] args) throws Exception {
  FileInputStream fis_stm = null;
  FileDescriptor file_desc = null;

  try {
   // Instantiates FileInputStream
   fis_stm = new FileInputStream("C:\\includehelp.txt");

   // By using getFD() method is to return
   // FileDescriptor linked with the stream	

   file_desc = fis_stm.getFD();
   System.out.println("fis_stm.getFD(): " + file_desc);
  } catch (Exception ex) {
   System.out.println(ex.toString());
  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (fis_stm != null) {
    fis_stm.close();
   }
  }
 }
}

Output

fis_stm.getFD(): java.io.FileDescriptor@7bfcd12c