Seal helper class

src/main/java/com/solab/iso8583/util/HexCodec.java

@@ -1,10 +1,12 @@
 package com.solab.iso8583.util;
 
 /** Utility class to perform HEX encoding/decoding of values. */
-public class HexCodec {
+public final class HexCodec {
 
 	static final char[] HEX = new char[]{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 
+    private HexCodec(){}
+
 	public static String hexEncode(byte[] buffer, int start, int length) {
 		if (buffer.length == 0) {
 			return "";