Java...Bag Implementation: In mathematics, the concepts of bags and sets are closely related. The difference is that bags allow duplicate items, while a set does not. An operation that removes the duplicates from a bag would be helpful if one wished to implement a set. Write a method in the ArrayBag class that removes the dublicates of all items in a bag: public void removeAllDuplicates() {...} Write also a client class TestArrayBag to test the removeAllDublicates method.