JAVA Math 140 Programming Assignment 2 Deadline: Feb 27, 2019, 11:59 pm 4. public static intl] threeDimensionalToOneDimensional(int[)00 arr) if arr is null then return null e otherwise (i) copy the non-null two-dimensional arrays in arr to a one- dimensional array and (i) return the one-dimensional array. . arr may contain two-dimensional arrays that are set to null. the length of the returned array should be equal to the number of integers stored in the non-null two-dimensional arrays. copy the non-null two-dimensional arrays in ascending order. In other words, first copy array 0 to the one-dimensional array, then array 1, 2, etc. if all two-dimensional arrays contained in arr are null then return an array whose length is zero. for every non-null array stored in arr, use the System.arraycopy method to . copy the result from twoDimensionalToOneDimensional into the one- dimensional array Example: Assume arr { ((null, (9, 0, 8), null, (o, 7, 6, 3, 4)1, null 18, 9, 45, 8, 0), (6, 7, 2), (4, 8)) The method returns the following one-dimensional array: (9, 0, 8, 0, 7, 6, 3, 4, 9, 1, 50, 99, 11, 6, 8, 9, 45, 8, 0, 6, 7, 2, 4, 8)