Show how quickly java.util collections break in a multi-threaded environment

gistfile1.txt

package net.model3.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ShowMeThatCME {

	static List<Integer> list = Collections.synchronizedList(new ArrayList<Integer>());
	
	public static void main(String[] args) {

		final int count = 9999;
		
		for ( int i=0 ; i<count ; i++ ) {
			list.add(i);
		}

		Thread reader = new Thread("reader") {
			@Override
			public void run() {
				while( true ) {
					int sum = 0;
					for ( Integer i : list ) {
						sum += i;
					}
				}
			}
		};

		Thread writer = new Thread("writer") {
			@Override
			public void run() {
				while( true ) {
					for ( int i=0 ; i<count ; i++ ) {
						list.add(i);
					}
					for ( int i=0 ; i<count ; i++ ) {
						list.remove(list.size()-1);
					}
				}
			}
		};

		reader.start();
		writer.start();
		
	}

}