CopyOnWriteArrayList difference with normal ArrayList

java.util.ConcurrentModificationException.java

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/*
 * Difference between ArrayList and CopyOnWriteArrayList
 */
public class CopyOnWriteArrayListTest {

	public static void main(String[] args) {

		
		CopyOnWriteArrayList copyOnWriteArrayList = new CopyOnWriteArrayList();
		copyOnWriteArrayList.add("copyOnWriteArrayList_item");
		copyOnWriteArrayList.add("copyOnWriteArrayList_item1");
		Iterator iCopyIterator = copyOnWriteArrayList.iterator();
		while (iCopyIterator.hasNext()) {
			//System.out.println(iCopyIterator.next());
			iCopyIterator.next();
			copyOnWriteArrayList.add("copyOnWriteArrayList_item2");
		}
		System.out.println("|---- After modification of copyOnWriteArrayList ----| ");
		Iterator i2 = copyOnWriteArrayList.iterator();
		while (i2.hasNext()) {
			System.out.println(i2.next());
		}
		
		/*
		 * If List modified in the loop iteration it will throw
		 * ConcurrentModificationException or if multiple threads try to modify
		 * the List in loop iteration will throw the exception for normal arrayList
		 */

		List list = new ArrayList();
		list.add("test");
		list.add("test1");
		Iterator listIterator = list.iterator();
		while (listIterator.hasNext()) {
			System.out.println(listIterator.next());
			list.add("test2");
		}

		

	}

}