java - Easy way to concatenate two byte arrays

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What is the easy way to concatenate
two byte
arrays?

Say,

byte
            a[];
byte
            b[];

How do
I concatenate two byte arrays and store it in another
byte array?

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class="normal">Answer

Most
straightforward:

byte[] c = new
            byte[a.length + b.length];
System.arraycopy(a, 0, c, 0,
            a.length);
System.arraycopy(b, 0, c, a.length,
            b.length);