JUC中的Condition

JUC中的Condition

package com.atguigu.juc; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; /* * 生产者消费者案例： */ public class TestProductorAndConsumerForLock { public static void main(String[] args) { Clerk clerk = new Clerk(); Productor pro = new Productor(clerk); Consumer con = new Consumer(clerk); new Thread(pro, "生产者 A").start(); new Thread(con, "消费者 B").start(); // new Thread(pro, "生产者 C").start(); // new Thread(con, "消费者 D").start(); } } class Clerk { private int product = 0; private Lock lock = new ReentrantLock(); private Condition condition = lock.newCondition(); // 进货 public void get() { lock.lock(); try { if (product >= 1) { // 为了避免虚假唤醒，应该总是使用在循环中。 System.out.println("产品已满！"); try { condition.await(); } catch (InterruptedException e) { } } System.out.println(Thread.currentThread().getName() + " : " + ++product); condition.signalAll(); } finally { lock.unlock(); } } // 卖货 public void sale() { lock.lock(); try { if (product <= 0) { System.out.println("缺货！"); try { condition.await(); } catch (InterruptedException e) { } } System.out.println(Thread.currentThread().getName() + " : " + --product); condition.signalAll(); } finally { lock.unlock(); } } } // 生产者 class Productor implements Runnable { private Clerk clerk; public Productor(Clerk clerk) { this.clerk = clerk; } @Override public void run() { for (int i = 0; i < 20; i++) { try { Thread.sleep(200); } catch (InterruptedException e) { e.printStackTrace(); } clerk.get(); } } } // 消费者 class Consumer implements Runnable { private Clerk clerk; public Consumer(Clerk clerk) { this.clerk = clerk; } @Override public void run() { for (int i = 0; i < 20; i++) { clerk.sale(); } } }