Question

I am having this problem that I had used Arraylist in my entire program up till now and now I need its functioning to be that of priority queue too.

So I did the obvious that seemed to me and casted it like PriorityQueue z = (PriorityQueue) x
where x was arraylist.

At runtime this gave an error that this is not possible.

Is there any simple way to make this work. I can’t change entire array list as a priority queue since then I’ll have to update all the functions used…..

Should I add item each time from arraylist to a new priority queue or is there a better method…

Thanks a lot…

Answer 1

PriorityQueue pq = new PriorityQueue();
pq.addAll(x);