演示ReadWriteLock用法的示例

import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class ReadWriteLockExample {
    private static final ReadWriteLock lock = new ReentrantReadWriteLock();
    private static int sharedData = 0;

    public static void main(String[] args) {
        Thread reader1 = new Thread(() -> {
            lock.readLock().lock();
            try {
                System.out.println("Reader 1 reads shared data: " + sharedData);
            } finally {
                lock.readLock().unlock();
            }
        });

        Thread reader2 = new Thread(() -> {
            lock.readLock().lock();
            try {
                System.out.println("Reader 2 reads shared data: " + sharedData);
            } finally {
                lock.readLock().unlock();
            }
        });

        Thread writer = new Thread(() -> {
            lock.writeLock().lock();
            try {
                sharedData = 42;
                System.out.println("Writer writes shared data: " + sharedData);
            } finally {
                lock.writeLock().unlock();
            }
        });

        reader1.start();
        reader2.start();
        writer.start();
    }
}