Concurrent Modification Demo

package org.unifiedtech.demo;

import java.util.ArrayList;

public class Program
{
    public static void main(String[] args)
    {
        ArrayList<Integer> list = new ArrayList<Integer>();

        for(Integer i = 0; i < 100; i++)
            list.add(i);

        for(int i : list)
            if ((i % 2) == 0)
                list.remove(list.indexOf(i));
    }
}


Exception in thread "main" java.util.ConcurrentModificationException
    at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
    at java.util.AbstractList$Itr.next(Unknown Source)
    at org.unifiedtech.demo.Program.main(Program.java:14)