一、使用Lock来模拟生产消费
关键方法：lock()、await()、signalAll()、unlock()
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;/*题目：一个初始值为0的变量，两个线程对其交替操作，一个加一一个减一，来5轮*/
public class ProdConsumer_LockDemo {public static void main(String[] args) {ShareData shareData = new ShareData();new Thread(() -> {for (int i = 0; i < 5; i++) {shareData.increment();}},"生产线程").start();new Thread(() -> {for (int i = 0; i < 5; i++) {shareData.decrement();}}, "消费线程").start();}
}class ShareData{private int number=0;private Lock lock = new ReentrantLock();private Condition condition = lock.newCondition();public void increment(){lock.lock();try{//使用while防止虚假唤醒while (number != 0) {//等待，不能生产condition.await();}number ++;System.out.println(Thread.currentThread().getName()+"\t"+number);condition.signalAll();}catch (Exception e) {}finally {lock.unlock();}}public void decrement(){lock.lock();try{//使用while防止虚假唤醒while (number == 0) {//等待，不能生产condition.await();}number --;System.out.println(Thread.currentThread().getName()+"\t"+number);condition.signalAll();}catch (Exception e) {}finally {lock.unlock();}}}