Easy way to concatenate two byte arrays

Question

What is the easy way to concatenate two byte arrays?

Say,

byte a[];
byte b[];

How do I concatenate two byte

Answer 1

Here's a nice solution using Guava's com.google.common.primitives.Bytes:

byte[] c = Bytes.concat(a, b);

The great thing about this method is that it has a varargs signature:

public static byte[] concat(byte[]... arrays)

which means that you can concatenate an arbitrary number of arrays in a single method call.