java读写锁有关问题（ReentrantReadWriteLock）

public class JsonUtil {    private static final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();    private static final Lock rLock = rwl.readLock();    private static final Lock wLock = rwl.writeLock();               public static void read(){              try{                   rLock.lock();                   读的一些操作。。。。。               } finally {           rLock.unlock();           }       }       public static void write(){              try{                   wLock.lock();                   写的一些操作。。。。。               } finally {           wLock.unlock();           }       }