内容：读锁时共享的。写锁时相互排斥的(可见执行结果)。都是通过AQS实现的。

public class ReentrantReadWriteLockTest {

	static class MyObject {

		private Object object;

		private ReadWriteLock lock = new ReentrantReadWriteLock();

		public void get() {

			lock.readLock().lock();

			System.out.println(Thread.currentThread().getName() + "准备读数据!!");

			try {

				Thread.sleep(new Random().nextInt(1000));

				System.out.println(Thread.currentThread().getName() + "读数据为:" + this.object);

			} catch (InterruptedException e) {

				e.printStackTrace();

			} finally {

				lock.readLock().unlock();

			}

		}

		public void put(Object object) {

			lock.writeLock().lock();

			System.out.println(Thread.currentThread().getName() + "准备写数据");

			try {

				Thread.sleep(new Random().nextInt(1000));

				this.object = object;

				System.out.println(Thread.currentThread().getName() + "写数据为" + this.object);

			} catch (InterruptedException e) {

				e.printStackTrace();

			} finally {

				lock.writeLock().unlock();

			}

		}

	}

	public static void main(String[] args) throws InterruptedException {

		final MyObject myObject = new MyObject();

		ExecutorService executor = Executors.newCachedThreadPool();

		for (int i = 0; i < 3; i++) {

			executor.execute(new Runnable() {

				@Override

				public void run() {

					for (int j = 0; j < 5; j++)

						myObject.put(new Random().nextInt(1000));

				}

			});

		}

		for (int i = 0; i < 3; i++) {

			executor.execute(new Runnable() {

				@Override

				public void run() {

					for (int j = 0; j < 5; j++)

						myObject.get();

				}

			});

		}

		executor.shutdown();

	}

}

执行结果：