在多线程编程里面一个重要的概念是锁定，如果一个资源是多个线程共享的，为了保证数据的完整性， 在进行事务性操作时需要将共享资源锁定，这样可以保证在做事务性操作时只有一个线程能对资源进行操作， 从而保证数据的完整性

-In multithreaded programming is an important concept inside the lock, if a resource is shared by multiple threads, in order to ensure data integrity, performing transactional operations needs to be a shared resource lock, so you can ensure that when doing transactional operations Only one thread can operate the resource, to ensure data integrity