Java PushbackInputStream - Code Example

What will be the output of the following PushbackInputStream code:

You have a text file Test1.txt. The test1.txt contains the following text: 

abcdefghijklmnopqrstuvwxyz

The following code reads the file Test1.txt. Can you guess the output of the following code?

/**

 *

 * @author Nancy K A N

 */

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PushbackInputStream;

public class PushbackInputStreamDemo {

    public static void main(String[] args) throws IOException{

        try {

            

            PushbackInputStream piStream= new PushbackInputStream(

                    new FileInputStream("C:\\JavaPractice\\BlogJava\\Test1.txt"));

            int readByte = piStream.read();

            System.out.println((char)(readByte));

            readByte=piStream.read();

            System.out.println((char)(readByte));

            readByte=piStream.read();

            System.out.println((char)(readByte));

            piStream.unread(readByte);

            readByte=piStream.read();

            System.out.println((char)(readByte));

           

        } catch (FileNotFoundException ex) {

            System.out.println("File not found");

        }       

    }

}

Created by Nancy N.

@14:50 09-Jun-2025