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Java ObjectOutputStream writeDouble() Method with Example

ObjectOutputStream Class writeDouble() method: Here, we are going to learn about the writeDouble() method of ObjectOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 10, 2020

ObjectOutputStream Class writeDouble() method

• writeDouble() method is available in java.io package.
• writeDouble() method is used to write the given 8 bytes (i.e. 64 bit) double value.
• writeDouble() 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.
• writeDouble() method may throw an exception at the time of writing double.
  IOException: This exception may throw when getting any input/output error while writing to the output stream.

Syntax:

    public void writeDouble(double value);

Parameter(s):

• double value – represents the double value to be written.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void writeDouble(double value)
// method of ObjectOutputStream

import java.io.*;

public class WriteDoubleOfOOS {
 public static void main(String[] args) throws Exception {
  // Instantiates ObjectOutputStream , ObjectInputStream 
  // FileInputStream and FileOutputStream

  FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
  ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
  FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
  ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);

  // By using writeDouble() method is to
  // write the double to the stream		
  obj_out_stm.writeDouble(10.0);
  obj_out_stm.writeDouble(20.0);
  obj_out_stm.writeDouble(30.0);
  obj_out_stm.writeDouble(40.0);

  obj_out_stm.flush();

  // By using readDouble() method is to 
  // read the double 
  for (int i = 0; i < 4; ++i) {
   double d = obj_in_stm.readDouble();
   System.out.println("obj_in_stm.readDouble(): " + d);
  }

  // By using close() method is to 
  // close all the streams 
  System.out.println("Stream Shutdown...");

  file_in_stm.close();
  file_out_stm.close();
  obj_in_stm.close();
  obj_out_stm.close();
 }
}

Output

obj_in_stm.readDouble(): 10.0
obj_in_stm.readDouble(): 20.0
obj_in_stm.readDouble(): 30.0
obj_in_stm.readDouble(): 40.0
Stream Shutdown...