問題詳情

193.Given that the elements of a PriorityQueue are ordered according to natural ordering, and: 2. import java.util.*; 3. public class GetInLine{ 4. public static void main(String[] args){ 5. PriorityQueue<String> pq = new PriorityQueue<String>(); 6. pq.add("banana"); 7. pq.add("pear"); 8. pq.add("apple"); 9. System.out.println(pq.poll() + " " + pq.peek()); 10. } 11. } What is the result?
(A) apple pear
(B) banana pear
(C) apple apple
(D) apple banana
(E) banana banana

參考答案