Review

class ArrayUtils {
    /**
     * <p>Removes the first occurrence of the specified element from the
     * specified array. All subsequent elements are shifted to the left 
     * (substracts one from their indices). If the array doesn't contains
     * such an element, no elements are removed from the array.</p>
     *
     * <p>This method returns a new array with the same elements of the input
     * array except the first occurrence of the specified element. The component 
     * type of the returned array is always the same as that of the input 
     * array.</p>
     *
     * <pre>
     * ArrayUtils.removeElement(null, 1)      = null
     * ArrayUtils.removeElement([], 1)        = []
     * ArrayUtils.removeElement([1], 2)       = [1]
     * ArrayUtils.removeElement([1, 3], 1)    = [3]
     * ArrayUtils.removeElement([1, 3, 1], 1) = [3, 1]
     * </pre>
     * 
     * @param array  the array to remove the element from, may be <code>null</code>
     * @param element  the element to be removed
     * @return A new array containing the existing elements except the first
     *         occurrence of the specified element.
     * @since 2.1
     */
    public static long[] removeElement(long[] array, long element) {
        int index = indexOf(array, element);
        if (index == INDEX_NOT_FOUND) {
            return clone(array);
        } 
        return remove(array, index);
    }

}