Java8 programming, generics,collections,interfaces; please explain in detail

Question 4: Generic Array You are to implement a generic array that will allow any only data of a specific type added to the array. public class GenericArray { private T[] array; public GenericArray () { //initialise array here //Define your remaining methods The array must support the following operations: long size (), returns the capacity of the array. T set (int index, T element), sets an element in the array. Tget (int index), returns an element at a specific index, should throw IndexOutOf- BoundsError if index is = size(). long resize (long newSize), returns the old size and resizes the array