public synchronized boolean tryReadLock() {
        if (isWriteLocked()) {
            return false;
        } else {
            status++;
            return true;
        }
    }
@Test
    public void multiTryReadLockTest() {
        SimpleReadWriteLock simpleReadWriteLock = new SimpleReadWriteLock();
        simpleReadWriteLock.tryReadLock();
        boolean result = simpleReadWriteLock.tryReadLock();
        Assert.isTrue(result);
    }