Java ReadWriteLock 接口

使用示例

public class Test {
    private ReadWriteLock rwLock = new ReentrantReadWriteLock();
    //写锁
    public void write() {
        rwLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+":写开始！");
            TimeUnit.SECONDS.sleep(1);
            System.out.println(Thread.currentThread().getName()+":写结束！");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            rwLock.writeLock().unlock();
        }
    }
    //读锁
    public void read() {
        rwLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+":读开始！");
            TimeUnit.SECONDS.sleep(1);
            System.out.println(Thread.currentThread().getName()+":读结束！");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            rwLock.readLock().unlock();
        }
    }

    public static void main(String[] args) throws Exception{
        Test test = new Test();
        for(int i=1; i<=3; i++) {
           new Thread(() -> {
               test.write();
           }, "Thread-"+i).start();
        }
        for(int i=4; i<=6; i++) {
            new Thread(() -> {
                test.read();
            }, "Thread-"+i).start();
        }
    }
}

结果：
Thread-1:写开始！
Thread-1:写结束！
Thread-2:写开始！
Thread-2:写结束！
Thread-3:写开始！
Thread-3:写结束！
Thread-4:读开始！
Thread-5:读开始！
Thread-6:读开始！
Thread-4:读结束！
Thread-5:读结束！
Thread-6:读结束！