How can I merge two Java arrays into one combined array?

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Oct 13

How can I merge two Java arrays into one combined array?

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The following utility method will allow you to merge any number of arrays.


    public static <T> T[] arrayMerge(T[]... arrays)
    {
        // Determine required size of new array

        int count = 0;
        for (T[] array : arrays)
        {
            count += array.length;
        }

        // create new array of required class

        T[] mergedArray = (T[]) Array.newInstance(
           arrays[0][0].getClass(),count);

        // Merge each array into new array

        int start = 0;
        for (T[] array : arrays)
        {
            System.arraycopy(array, 0,
               mergedArray, start, array.length);
            start += array.length;
        }
        return (T[]) mergedArray;
    }