元素网站,平面设计电商设计,怎么做班级网站,去哪儿网站做宣传多少钱文章目录背景多线程场景测试代码结论背景
ThreadLocal原理以及基本概念这里我就不介绍了#xff0c;这里我们主要关注ThreadLocal是否是线程安全吗#xff1f;其实如果我们知道ThreadLocal原理我们肯定知道它是线程安全的#xff0c;但是我在开发的时候不放心做了个测试这里我们主要关注ThreadLocal是否是线程安全吗其实如果我们知道ThreadLocal原理我们肯定知道它是线程安全的但是我在开发的时候不放心做了个测试也顺便把测试demo贴一下
多线程场景测试代码
多线程测试代码
package net.dreamzuora.utils;import java.util.UUID;
import java.util.concurrent.*;public class ThreadLocalMultiThread {ThreadLocalString threadLocal new ThreadLocal();public static void main(String[] args) throws InterruptedException {CountDownLatch countDownLatch new CountDownLatch(1);ThreadPoolExecutor.CallerRunsPolicy callerRunsPolicy new ThreadPoolExecutor.CallerRunsPolicy();ThreadPoolExecutor threadPoolExecutor new ThreadPoolExecutor(5, 10, 3, TimeUnit.SECONDS, new ArrayBlockingQueue(200), new MyThreadFactory(), callerRunsPolicy);ThreadLocalMultiThread threadLocalMultiThread new ThreadLocalMultiThread();for (int k 0; k 500; k){threadPoolExecutor.execute(threadLocalMultiThread.new TestWorker());}countDownLatch.await();}class TestWorker implements Runnable{Overridepublic void run() {try {String s UUID.randomUUID().toString();System.out.println(System.currentTimeMillis() Thread.currentThread().getName() producer : s);threadLocal.set(s);TimeUnit.SECONDS.sleep(1);System.out.println(System.currentTimeMillis() Thread.currentThread().getName() consumer : threadLocal.get());threadLocal.remove();} catch (InterruptedException e) {e.printStackTrace();}}}static int i 0;static class MyThreadFactory implements ThreadFactory{Overridepublic Thread newThread(Runnable r) {return new Thread(r, my thread- i);}}}
输出结果 结论
最终可以发现在用一个线程中生产和消费他们的UUID始终是一致的因而可以通过测试案例证明他们是线程安全的可以放心使用啦
