How can I concatenate two arrays in Java?

Question

I need to concatenate two String arrays in Java.

void f(String[] first, String[] second) {
    String[] both = ???
}

What is t

Answer 1

Another way to think about the question. To concatenate two or more arrays, one have to do is to list all elements of each arrays, and then build a new array. This sounds like create a List and then calls toArray on it. Some other answers uses ArrayList, and that's fine. But how about implement our own? It is not hard:

private static  T[] addAll(final T[] f, final T...o){
    return new AbstractList(){

        @Override
        public T get(int i) {
            return i>=f.length ? o[i - f.length] : f[i];
        }

        @Override
        public int size() {
            return f.length + o.length;
        }

    }.toArray(f);
}

I believe the above is equivalent to solutions that uses System.arraycopy. However I think this one has its own beauty.