You've done merge, so now time to mergesort! Create a public class named Mergesort that provides a single instance method (this is required for testing) named mergesort. mergesort accepts an array of ints and returns a sorted (ascending) array. You should not modify the passed array. If the array that is passed is null you should throw an IllegalArgumentException. Mergesort should extend Merge, and its parent provides several helpful methods: • int[] merge (int[] first, int[] second): this merges two sorted arrays into a second sorted array. If either array is null it throws an IllegalArgumentException, so don't call it on null arrays. • int[] copyOfRange (int[] original, int from, int to): this acts as a wrapper on java.util.Arrays.copyOfRange, accepting the same arguments and using them in the same way.

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.