Revision Question

Consider the following Java class:

{

public static void main (String [ ] args)

{

ArrayQueue queue;

queue = new ArrayQueue () ;

Integer x, y ;

x = 3;

y = 6;

queue.offer (x) ;

queue.offer (12) ;

queue.offer (y) ;

y = queue.peek () ;

queue.poll () ;

queue. offer (x - 2) ;

queue.offer (x) ;

queue.offer (y + 4) ;

System.out.println ("Queue Elements: ") ;

while (! queue.empty() )

System.out.print (queue.poll () + " " ) ;

}

}

In the above, assume that the queue interface is defined as follows:

public interface Queue

{

public boolean empty () ;

public int size () ;

public boolean offer (E x ) ;

public E peek () ;

public E poll () ;

}

and that the implementation ArrayQueue is as discussed in the lectures.

What output would be produced when the main method of the TestQueue class is executed? If you think that no output is produced, write None.