Discussion
What will be the output of the program?
import java.util.*;
public class Sketch33
{
public static void main(String[] args)
{
Queue<Integer> pq = new PriorityQueue<Integer>(
Arrays.asList(30, 10, 20));
System.out.print(pq.poll());
System.out.print(pq.poll());
System.out.print(pq.poll());
}
}
Answer: A
A PriorityQueue hands elements out in priority order, which for Integer is ascending, so successive polls give 10, 20 then 30 regardless of insertion order. Note that only removal is ordered: printing the queue itself would show internal heap order, which is not sorted.
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