Define a stack in terms of a queue, that is; create a class class Stacko ( Queue pool new Queue (); public void push(Object el) { pool.enqueue (el); Define a queue in terms of a stack. (a) Define a class StackQ, which uses one or more queues to implement a stack. Write a main class that tests this class also. (b) Define a class Queues, which uses one or more stacks to implement a queue. Write a main class that tests this class also.