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Java RandomAccessFile readByte() Method with Example

RandomAccessFile Class readByte() method: Here, we are going to learn about the readByte() method of RandomAccessFile Class with its syntax and example.
Submitted by Preeti Jain, on March 23, 2020

RandomAccessFile Class readByte() method

  • readByte() method is available in java.io package.
  • readByte() method is used to read byte value from this file as a signed eight-bit value.
  • 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 an exception while performing input/output operation.
    • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File).

Syntax:

    public final byte readByte();

Parameter(s):

  • It does not accept any parameter.

Return value:

The return type of this method is byte, it returns byte value of this RandomAccessFile as a signed 8 bits.

Example:

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

import java.io.*;

class RAFReadByte {
 public static void main(String[] args) throws Exception {
  // Instantiate a random access file
  // object with file name and permissions
  RandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");

  // By using writeUTF() method is to 
  // write data in the file
  ra_f.writeUTF("Welcome, in Java World!!!");

  // Initially set the file pointer
  // is at 2 for reading the file
  ra_f.seek(2);

  // By using readByte() method isto
  // read a byte value (signed 1 byte i.e.8 bit)
  // from this file 

  byte by = ra_f.readByte();
  System.out.println("ra_f.readByte(): " + by);

  // By using close() method isto
  // close this stream ran_f
  ra_f.close();
 }
}

Output

ra_f.readByte(): 87






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