Hand trace a queue X through the following operations: X.enqueue(new Integer(4)); X.enqueue(new Integer(1)); Object Y = X.dequeue();

Question:

Hand trace a queue X through the following operations:
X.enqueue(new Integer(4));
X.enqueue(new Integer(1));
Object Y = X.dequeue();
X.enqueue(new Integer(8));
X.enqueue(new Integer(2));
X.enqueue(new Integer(5));
X.enqueue(new Integer(3));
Object Y = X.dequeue();
X.enqueue(new Integer(4));
X.enqueue(new Integer(9));