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Java ObjectInputStream readByte() Method with Example

ObjectInputStream Class readByte() method: Here, we are going to learn about the readByte() method of ObjectInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 04, 2020

ObjectInputStream Class readByte() method

• readByte() method is available in java.io package.
• readByte() method is used to read a byte (i.e. 8 bit) of data from this ObjectInputStream.
• readByte() 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.
• readByte() method may throw an exception at the time of reading byte.
  • IOException: This exception may throw when getting any input/output error while performing.
  • EOFException: This exception may throw when the end of the file is reached.

Syntax:

    public byte readByte();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is byte, it returns the byte value read.

Example:

// Java program to demonstrate the example 
// of byte readByte() method of 
// ObjectInputStream

import java.io.*;

public class ReadByteOfOIS {
 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 writeUTF() method is to write
  // string to the obj_out_stm stream
  obj_out_stm.writeUTF("Java World!!!");

  obj_out_stm.flush();

  while (obj_in_stm.available() > 0) {
   // By using readByte() method is to read
   // string characters as a byte
   byte val = (byte) obj_in_stm.readByte();
   System.out.println("obj_in_stm.readByte(): " + val);
  }

  // By using close() method is to 
  // close all the streams 
  file_in_stm.close();
  file_out_stm.close();
  obj_in_stm.close();
  obj_out_stm.close();
 }
}

Output

obj_in_stm.readByte(): 0
obj_in_stm.readByte(): 13
obj_in_stm.readByte(): 74
obj_in_stm.readByte(): 97
obj_in_stm.readByte(): 118
obj_in_stm.readByte(): 97
obj_in_stm.readByte(): 32
obj_in_stm.readByte(): 87
obj_in_stm.readByte(): 111
obj_in_stm.readByte(): 114
obj_in_stm.readByte(): 108
obj_in_stm.readByte(): 100
obj_in_stm.readByte(): 33
obj_in_stm.readByte(): 33
obj_in_stm.readByte(): 33