public synchronized boolean tryWriteLock() {
        if (!isFree()) {
            return false;
        } else {
            status = FREE_STATUS;
            return true;
        }
    }
@Test
    public void multiTryWriteLockTest() {
        SimpleReadWriteLock simpleReadWriteLock = new SimpleReadWriteLock();
        simpleReadWriteLock.tryWriteLock();
        boolean result = simpleReadWriteLock.tryWriteLock();
        Assert.isTrue(!result);
    }