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Java ObjectOutputStream writeBytes() Method with Example

ObjectOutputStream Class writeBytes() method: Here, we are going to learn about the writeBytes() method of ObjectOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 09, 2020

ObjectOutputStream Class writeBytes() method

• writeBytes() method is available in java.io package.
• writeBytes() method is used to write the given string as a sequence of bytes.
• writeBytes() 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.
• writeBytes() method may throw an exception at the time of writing bytes.
  IOException: This exception may throw when getting any input/output error while writing to the output stream.

Syntax:

    public void writeBytes(String s);

Parameter(s):

• String s – represents the string 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 writeBytes(String s) method of
// ObjectOutputStream

import java.io.*;

public class WriteBytesOfOOS {
 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 writeBytes() method is to
  // write the bytes to the stream		
  obj_out_stm.writeBytes("Java");

  obj_out_stm.flush();


  // By using readByte() method is to 
  // read the byte and convert it into
  // char
  for (int i = 0; i < 4; ++i) {
   char ch = (char) obj_in_stm.readByte();
   System.out.println("obj_in_stm.readByte(): " + ch);
  }

  // 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.readByte(): J
obj_in_stm.readByte(): a
obj_in_stm.readByte(): v
obj_in_stm.readByte(): a
Stream Shutdown...