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java.util.concurrent包提供了大量的并发工具。 大家好,我是李福春,今天的题目是: java提供的并发工具有哪些? 答:java.util.concurrent工具包中提供的工具分4大类。 一, 同步工具,CountDownLatch, CyclicBarrier , Semaphore ;二, 并发安全容器, ConcurrentHashMap,ConcurrentSkipListMap,CopyOnWriteArrayList,CopyOnWriteArraySet;三,并发安全队列,主要用在线程池上,ArrayBlockingQueue,SynchronousQueue,PriorityBlockingQueue;四,并发线程池executor框架;package org.example.mianshi.synctool;import java.util.concurrent.Semaphore;/** * 创建日期: 2020/3/30 14:24 * 描述: 信号量应用 * * @author lifuchun */public class SemaphoreApp { public static void main(String[] args) { Semaphore semaphore = new Semaphore(0); for (int i = 1; i <= 10; i++) { new MyThread(semaphore).start(); } System.out.println("go ```"); semaphore.release(5); } public static class MyThread extends Thread { private Semaphore semaphore; public MyThread(Semaphore semaphore) { this.semaphore = semaphore; } @Override public void run() { try { semaphore.acquire(); System.out.println(System.currentTimeMillis() + " :" + Thread.currentThread().getName() + " -execute ```"); } catch (InterruptedException e) { e.printStackTrace(); } finally { semaphore.release(); } } }}
package org.example.mianshi.synctool;import java.util.concurrent.CountDownLatch;import java.util.stream.IntStream;/** * 创建日期: 2020/3/30 14:38 * 描述: countDownLatch的例子 * @author lifuchun */public class CountDownLatchApp { public static void main(String[] args) { CountDownLatch countDownLatch = new CountDownLatch(5); new Thread(() -> { try { countDownLatch.await(); System.out.println("后置任务"); } catch (InterruptedException e) { e.printStackTrace(); } }).start(); IntStream.rangeClosed(1, 10) .forEach(i -> new MyThread(countDownLatch).start()); } public static class MyThread extends Thread { private CountDownLatch countDownLatch; public MyThread(CountDownLatch countDownLatch) { this.countDownLatch = countDownLatch; } @Override public void run() { countDownLatch.countDown(); System.out.println("前置任务"); } }}
package org.example.mianshi.synctool;import java.util.concurrent.BrokenBarrierException;import java.util.concurrent.CyclicBarrier;import java.util.stream.IntStream;/** * 创建日期: 2020/3/30 14:49 * 描述: cyclicBarrier的应用 * * @author lifuchun */public class CyclicBarrierApp { public static void main(String[] args) { CyclicBarrier cyclicBarrier = new CyclicBarrier(3, CyclicBarrierApp::run); IntStream.rangeClosed(1, 30) .forEach(i -> new MyThread(cyclicBarrier).start()); } private static void run() { System.out.println("reset , start again !"); } public static class MyThread extends Thread { private CyclicBarrier cyclicBarrier; public MyThread(CyclicBarrier cyclicBarrier) { this.cyclicBarrier = cyclicBarrier; } @Override public void run() { try { cyclicBarrier.await(); } catch (InterruptedException | BrokenBarrierException e) { e.printStackTrace(); } System.out.println("do my work!"); } }}
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