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Java FileOutputStream getFD() Method with Example

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

FileOutputStream Class getFD() method

• getFD() method is available in java.io package.
• getFD() method is used to return the FileDescriptor object linked with this FileOutputStream that denotes the connection to the actual file in the file system.
• 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 may throw an exception at the time of returning the file descriptor.
  IOException: This exception may throw when getting any input/output error while performing.

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 FileDescriptor object linked with this FileOutputStream.

Example:

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

import java.io.*;

public class GetFDOfFOS {
 public static void main(String[] args) throws Exception {
  FileOutputStream fos_stm = null;
  FileDescriptor file_desc = null;

  try {
   // Instantiates FileOutputStream
   fos_stm = new FileOutputStream("D:\\includehelp.txt");

   // By using getFD() method is to return
   // FileDescriptor linked with the stream	
   file_desc = fos_stm.getFD();
   System.out.println("fos_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 (fos_stm != null) {
    fos_stm.close();
   }
  }
 }
}

Output

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