十五、读写锁

import java.util.concurrent.locks.ReentrantReadWriteLock;

public class ReadWriteLockDemo {
    private static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    private static ReentrantReadWriteLock.ReadLock readLock = lock.readLock();
    private static ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();

    private static void read() {
        for (int i = 0; i < 2; i++) {
            int finalI = i;
            new Thread(() -> {
                readLock.lock();
                try {
                    System.out.println("get read lock i=" + finalI);
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                readLock.unlock();
            }).start();
        }
    }

    public static void write() {
        new Thread(() -> {
            writeLock.lock();
            System.out.println("get write lock");
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            writeLock.unlock();
        }).start();
    }

    public static void main(String[] args) throws InterruptedException {
        write();
        read();
    }
}