Java Tutorial : Java IO (ByteArrayOutputStream reset method)

Click here to watch in Youtube :
https://www.youtube.com/watch?v=lh9Pszg84Ro&list=UUhwKlOVR041tngjerWxVccw

ByteArrayOutputStreamDemo.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class ByteArrayOutputStreamDemo
{
    /*
     * Created an instance of ByteArrayOutputStream and
     * wrote 10 random bytes into it. After that, I turned
     * the ByteArrayOutputStream instance into a byte array,
     * using the toByteArray() method, and then printed
     * every byte using a foreach loop.
     * 
     * Using the reset() method to reset the
     * ByteArrayOutputStream instance. Then, using the
     * write() method to write four of the elements of
     * byteArray, starting from the index 4 (which is the
     * offset).
     */

    public static void main(String[] args) throws IOException
    {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

        for (int i = 0; i < 10; i++)
        {
            byteArrayOutputStream.write((byte) (Math.random() * 100));
        }

        byte[] byteArray = byteArrayOutputStream.toByteArray();
        System.out.println("The original array:");
        for (byte b : byteArray)
        {
            System.out.print(b + " ");
        }

        /*
         * Resets the count field of this byte array output
         * stream to zero, so that all currently accumulated
         * output in the output stream is discarded. The
         * output stream can be used again, reusing the
         * already allocated buffer space.
         */
        byteArrayOutputStream.reset();

        /*
         * Writes len bytes from the specified byte array
         * starting at offset off to this byte array output
         * stream.
         */
        byteArrayOutputStream.write(byteArray, 2, 4);
        System.out.println("\n\nThe new byte array:");
        for (byte b : byteArrayOutputStream.toByteArray())
        {
            System.out.print(b + " ");
        }
    }

}

Output

The original array:
99 4 47 40 59 61 14 36 37 57 

The new byte array:
47 40 59 61 

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/JavaIODemo_ByteArrayOS_reset_method_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/JavaIODemo_ByteArrayOS_reset_method_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/d261aab7f0b47dd247e532c02763fe1d7053f5d3/BasicJava/JavaIODemo_ByteArrayOS_reset_method_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial