Java tutorial
//package com.java2s; //License from project: Apache License public class Main { public static byte[] toFormattedByteArray(String baseString) { return toFormattedByteArray(baseString.getBytes()); } public static byte[] toFormattedByteArray(byte[] baseArray) { int length = baseArray.length; byte[] byteArray = new byte[length + 1]; byteArray[0] = (byte) length; for (int i = 0; i < length; i++) { byteArray[i + 1] = baseArray[i]; } return byteArray; } }