• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

PriorityQueue

 
Greenhorn
Posts: 19
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I executed the following code.
import java.util.*;

class DemoPQ {
public static void main(String[] args) {
PriorityQueue<String> pq = new PriorityQueue<String>();
pq.add("Ravi");
pq.add("Kumar");
pq.add("Sumit");
pq.add("Vineet");
pq.add("Amit");

for(String s q) {
System.out.print(pq.peek() + ", " + pq.poll());

}
}

}

Got the output as Amit followed by ConcurrentModificationException.
May I know why does this exception come?

Thanks,
Sumi
 
Ranch Hand
Posts: 558
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I think polling(removing element) causing the Iteration get effected. try to poll outside the loop.
 
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,
For each iteration the current thread (main) read an element from the Queue and then alter it with the poll method.
So at the second iteration, the content of collection (pq) has changed and it's the cause of the throw of ConcurrentModificationException. Read the Javadoc of it.

If you write something like :

it works fine.
 
reply
    Bookmark Topic Watch Topic
  • New Topic