ObjectInputStream readByte() method in Java with examples

The readByte() method of the ObjectInputStream class in Java is used to read the 8 bit (byte).

Syntax:

public byte readByte()

Parameters: This method does not accept any parameter.

Return Value: This method returns the 8 bit byte read

Errors and Exceptions: The function throws three exceptions which is described below:

• EOFException: The exception is thrown if the end of file is reached.
• IOException: The exception is thrown if an I/O error has occurred.

Below program illustrate the above method:

Program 1:

Java

// Java program to illustrate
// the above method

import java.io.*;

public class GFG {

    public static void main(String[] args)
        throws IOException
    {
        byte[] array
            = { 1, 34, 23,
                42, 69, 22 };

        try {

            // create new byte
            // array input stream
            InputStream input
                = new ByteArrayInputStream(array);

            // create data input stream
            DataInputStream output
                = new DataInputStream(input);

            // readBoolean till the
            // data available to read
            while (output.available() > 0) {

                // read one single byte
                byte bt = output.readByte();

                // print the byte
                System.out.print(bt + " ");
            }
        }

        catch (Exception ex) {
        }
    }
}

Output:

Program 2:

Java

// Java program to illustrate
// the above method

import java.io.*;

public class GFG {

    public static void main(String[] args)
        throws IOException
    {
        byte[] array
            = { 'G', 'e', 'e', 'k',
                's', 'f', 'o', 'r',
                'g', 'e', 'e', 'k',
                's' };

        try {

            // create new byte
            // array input stream
            InputStream input
                = new ByteArrayInputStream(array);

            // create data input stream
            DataInputStream output
                = new DataInputStream(input);

            // readBoolean till the
            // data available to read
            while (output.available() > 0) {

                // read one single byte
                byte bt = output.readByte();

                // print the byte
                System.out.print(bt + " ");
            }
            System.out.println();
            System.out.println();
        }

        catch (Exception ex) {
        }
    }
}

Output:

Reference:

https://docs.oracle.com/javase/10/docs/api/java/io/ObjectInputStream.html#readByte()