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  ConcurrentModificationException  (Read 1039 times)
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Offline Soljaragz

Junior Member





« Posted 2006-02-06 05:19:09 »

I keep getting this error with this code

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   public boolean attackElement(int arrayIndex, int listIndex, int damage)
   {
     
      ((Enemy)enemyList[ arrayIndex ].get(listIndex) ).attack(damage);
      if( ( (Enemy)enemyList[ arrayIndex].get(listIndex) ).getHp()<=0)
      {
         elementsArray[( (Enemy)enemyList[ arrayIndex].get(listIndex) ).getIdRow()][( (Enemy)enemyList[ arrayIndex].get(listIndex) ).getIdCol()] = null;
         enemyList[arrayIndex].remove(listIndex); // this code causes error
        return true;
      }
      else
         return false;
   }      


what does that mean? I read the definition but i didn't understand it
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Offline Riven
« League of Dukes »

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Hand over your head.


« Reply #1 - Posted 2006-02-06 09:59:17 »

Why starting a new thread for the same problem?

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Offline Soljaragz

Junior Member





« Reply #2 - Posted 2006-02-06 15:17:54 »

my bad lol, but why would this error happen?
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Offline Riven
« League of Dukes »

JGO Overlord


Medals: 605
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #3 - Posted 2006-02-06 15:27:35 »

Read the JavaDocs for that method

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Offline Maverick

Senior Newbie





« Reply #4 - Posted 2006-02-06 17:08:17 »

this might help you:
CopyOnWriteArrayList

its in java.util.List
Offline Soljaragz

Junior Member





« Reply #5 - Posted 2006-02-06 21:13:30 »

Read the JavaDocs for that method



if you read my first post , i said i already read the java docs but i didnt understand the circumstances for the error to happen.

But so i am guessing the error happens BECAUSE im trying to change the arrayList while im iterating through it? am i correct?

if that is the case, than whats some options that i could use???
wouldnt a CopyOnWriteArrayList be too slow
Offline Soljaragz

Junior Member





« Reply #6 - Posted 2006-02-07 01:44:50 »

Ah ok! I understand now why I get this error (after making a few test appliacations),

My code was suppose to put the enemy in a different ArrayList each time he moves, but sometimes he would be in the same arrayList, and therefore adding to the current ArrayList while iterating through it at the same time will cause the error!!
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