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();
}

}