1. Write the Stack constructor. 2. Complete the pop method, using the following header public Object pop() throws EmptyStackException 3. Complete the push method, using the following header. public void push(Object ob) 4.Complete method reverseQ, whose header is given below. Method reverseQ should use a Stack to reverse the order of the items in its Queue parameter. public static void reverse0 (Queue q) // precondition: q contains x1 x2 XN (with x1 at the front) // postcondition: q contains XN x2 x1 (with xN at the front)