import java.io.ByteArrayInputStream;
import java.io.IOException;

public class ByteArrayInputStreamDemo
{

    public static void main(String[] args) throws IOException
    {
        String str = "abcdefghijklmnopqrstuvwxyz";
        byte[] byteArray = str.getBytes();

        ByteArrayInputStream byteArrayInputStream1 = new ByteArrayInputStream(byteArray);

        /*
         * The byteArrayInputStream1 contains all letters.
         */
        displayContent(byteArrayInputStream1);

        ByteArrayInputStream byteArrayInputStream2 = new ByteArrayInputStream(byteArray, 0, 3);

        /*
         * The byteArrayInputStream2 contains only the first
         * three letters.
         */
        displayContent(byteArrayInputStream2);

    }

    private static void displayContent(ByteArrayInputStream byteArrayInputStream)
    {
        int ch;
        while ((ch = byteArrayInputStream.read()) != -1)
        {
            System.out.print((char) ch);
        }
        System.out.println();
    }
}