solve the problem by implementing the whole class with main() function and demonstrate that your Java code can pass several appropriate test cases successfully in your main() function

6. Implement a method with signature concatenate(LinkedQueue<E> Q2) for the

LinkedQueue<E> class that takes all elements of Q2 and appends them to the

end of the original queue. The operation should run in O(1) time and should

result in Q2 being an empty queue.