Java-ReentrantReadWriteLock的简单样例

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：