浅析集合不安全例子

package com.bochy.list;


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


public class ArrayListConcurrentProblem {
	public static void main(String[] args) {
		final  List list = new ArrayList();
		// final List list = new Vector();
		for (int i = 0; i < 10000; i++) {
			list.add(i);
		}
		System.out.println(list.size());
		for (int i = 0; i < 10; i++)
			new Thread() {
				@Override
				public void run() {
					for (int i = 0; i < 1000; i++)
						list.remove(0);
				}
			}.start();
		System.out.println(list.size());
		for (int i = 0; i < 10; i++)
			new Thread() {
				@Override
				public void run() {
					for (int i = 0; i < 1000; i++)
						list.add(10000 * i + i);
				}
			}.start();
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
		}
		System.out.println(list.size());
	}
}
执行结果：
10000
9962
10237
原因在于：多线程并发资源