Java: How to convert int[] to byte[]

import java.nio.*; import java.net.*;  class Test {        public static void main(String [] args)         throws Exception // Just for simplicity!     {         int[] data = { 100, 200, 300, 400 };          ByteBuffer byteBuffer = ByteBuffer.allocate(data.length * 4);                 IntBuffer intBuffer = byteBuffer.asIntBuffer();         intBuffer.put(data);          byte[] array = byteBuffer.array();          for (int i=0; i < array.length; i++)         {             System.out.println(i + ": " + array[i]);         }     } }