Transferring the content of ByteArrayOutputStream to FileOutputStream file

//ByteArrayOutputStream to FileOutputStream

import java.io.*;
class ByteArrayOutputStreamDemo
{
public static void main(String args[]) throws IOException
{
ByteArrayOutputStream f = new ByteArrayOutputStream();
String s = "This should end up in the array";
byte buf[] = s.getBytes();
f.write(buf);

System.out.println("Buffer as a string");
System.out.println(f.toString());

System.out.println("Into array");
byte b[] = f.toByteArray();

for (int i=0; i<b.length; i++)
{
System.out.print((char) b[i]);
}

System.out.println("\nTo an OutputStream()");
OutputStream f2 = new FileOutputStream("test.txt");
f.writeTo(f2);
f2.close();
System.out.println("Doing a reset");
f.reset();
for (int i=0; i<3; i++)
f.write('X');
System.out.println(f.toString());
}
}