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avoiding java.util.ConcurrentModificationException in for loops

Posted on 2006-06-13
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Last Modified: 2007-12-19
What is the best way to avoid java.util.ConcurrentModificationException in the for loop below:

import java.util.Collection;
import java.util.Iterator;
import java.util.TreeSet;

import junit.framework.TestCase;

public class Test extends TestCase {


 
   public void testLoop()
   {
      Collection currentCollection = new TreeSet();
      currentCollection.add("AAA");
      currentCollection.add("BBB");
      currentCollection.add("CCC");
     
      Collection updatedCollection = new TreeSet();
      updatedCollection.add("CCC");
      updatedCollection.add("DDD");
      updatedCollection.add("EEE");
     
      for (Iterator iter = currentCollection.iterator(); iter.hasNext();) {
         String element = (String) iter.next();
         if(!updatedCollection.contains(element))
         {
            currentCollection.remove(element);
         }
         
      }
      assertTrue(currentCollection.contains("DDD"));
      assertTrue(currentCollection.contains("EEE"));
      assertFalse(currentCollection.contains("CCC"));
     
   }
   
}
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Question by:aturetsky
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3 Comments
 
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Accepted Solution

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CEHJ earned 1000 total points
ID: 16897118
Try changing

>>currentCollection.remove(element);

to

iter.remove();
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Author Comment

by:aturetsky
ID: 16898009
great, thanks !
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LVL 86

Expert Comment

by:CEHJ
ID: 16898060
:-)
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