JUC读写锁

ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
Lock readLock = readWriteLock.readLock();
Lock writeLock = readWriteLock.writeLock();
for (int i = 0; i < 5; i++) {
    new Thread(() -> {
        writeLock.lock();
        try {
            System.out.println(Thread.currentThread().getName()+"t开始写数据");
            try { TimeUnit.SECONDS.sleep(new Random().nextInt(5)); } catch(InterruptedException e) { e.printStackTrace(); }
            System.out.println(Thread.currentThread().getName()+"t写完数据");
        } finally {
            writeLock.unlock();
        }
    }, String.valueOf(i)).start();
}
for (int i = 0; i < 5; i++) {
    new Thread(() -> {
        readLock.lock();
        try {
            System.out.println(Thread.currentThread().getName()+"t开始读数据");
            try { TimeUnit.SECONDS.sleep(new Random().nextInt(5)); } catch(InterruptedException e) { e.printStackTrace(); }
            System.out.println(Thread.currentThread().getName()+"t读完数据");
        } finally {
            readLock.unlock();
        }
    }, String.valueOf(i)).start();
}