Concurrent Modification Exception : Concurrent Modification « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Concurrent Modification

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class MainClass {
  public static void main(String args[]) {
    List list = new ArrayList(Arrays.asList("a","b","c"));
    Iterator i = list.iterator();
    while (i.hasNext()) {
      System.out.println(i.next());
      list.add("Add");
    }
  }
}

a
Exception in thread "main" java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
	at java.util.AbstractList$Itr.next(AbstractList.java:420)
	at MainClass.main(MainClass.java:11)