### Question:
ArrayOperations { public static double[] removeFirstElements(double[] array, int numberOfElements) { assert(array.length > numberOfElements); double[] trimmedArray = new double[array.length - numberOfElements]; for (int i = 0; i < trimmedArray.length; i++) trimmedArray[i] = array[i + numberOfElements]; return trimmedArray; }  static double[] padArrayWithZerosToSize(double[] array, int newSize); static double[] convolve(double[] array1, double[] array2); static double[] reverse(double[] array); static double[] trimArrayToSize(double[] array, int size); static double[] removeFirstElements(double[] array, int numberOfElements); static Complex[] convertDoubleArrayToComplex(double[] input); static void fillArrayWithValue(double[] array, double value, int startIndex, int endIndex);  }### Answer:
@Test public void testRemoveFirstElements() { double[] array = new double[] {1, 2, 3, 4, 5, 6}; double[] trimmed = ArrayOperations.removeFirstElements(array, 2); assertEquals(4, trimmed.length); assertArrayEquals(trimmed, new double[] {3, 4, 5, 6}, 0.001); }