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public static long[] addArray(int[] array1, int[] array2) throws MismatchedArrayException, java.lang.NullPointerException {
if (array1==null || array2==null) {
throw new NullPointerException()
}
int len1 = array1.length;
int len2 = array2.length;
if (len1 != len2) {
throw new MismatchedArrayException(....)
}
//TODO
return ...
}