一句话:Vector线程安全,ArrayList线程不安全,以下是实验代码:
package com.yarm.test;
import java.util.ArrayList;
import java.util.Vector;
public class ArrayListAndVectorThread {
//实例化两个静态容器
static Vector<Integer> vector = new Vector<Integer>();
static ArrayList<Integer> arrayList = new ArrayList<Integer>();
public static class ArrayListThread implements Runnable{
public void run(){
for (int i = 0; i < 10000000; i++) {
//线程不安全
vector.add(i);
//线程安全
arrayList.add(i);
}
}
}
// main函数
public static void main(String[] args) throws InterruptedException {
Thread t1 = new Thread(new ArrayListThread());
Thread t2 = new Thread(new ArrayListThread());
t1.start();
t2.start();
t1.join(); t2.join();
System.out.println("arrayList长度:" + arrayList.size());
System.out.println("vector长度:" + vector.size());
}
}
控制台输出结果:
arrayList长度:19991800
vector长度:20000000
最后结论:
依照实验结果说明,ArrayList输出的长度不是20000000,而Vector的长度正好等于20000000,说明ArrayList线程不安全,Vector线程安全。