import java.util.*;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class LockConditionExample {
    private static final Lock lock = new ReentrantLock();
    private static final Condition condition = lock.newCondition();

    public static void main(String[] args) {
        Thread producer = new Thread(() -> {
            lock.lock();
            try {
                System.out.println("Producer: Producing...");
                Thread.sleep(2000);
                System.out.println("Producer: Production finished. Notifying consumer.");
                // 唤醒等待的线程
                condition.signal();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
            }
        });

        Thread consumer = new Thread(() -> {
            lock.lock();
            try {
                System.out.println("Consumer: Waiting for production to finish.");
                condition.await();
                System.out.println("Consumer: Production finished. Consuming...");
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
            }
        });

        consumer.start();
        producer.start();
    }
}