山东省城乡住房建设厅网站百度一下你就知道 官网

假设客户有信用卡.并且他有x金额的余额并且他正在购买y值项目(y (y z> x但z Java

解决方法:

我更喜欢有一个ReadWriteLock,这有助于锁定它进行读写,这很好,因为你可以为每个资源分别进行读写锁定：

ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

readWriteLock.readLock().lock();

// multiple readers can enter this section

// if not locked for writing, and not writers waiting

// to lock for writing.

readWriteLock.readLock().unlock();

readWriteLock.writeLock().lock();

// only one writer can enter this section,

// and only if no threads are currently reading.

readWriteLock.writeLock().unlock();

ReadWriteLock在内部保留两个Lock实例.一个保护读访问权限,一个保护写访问权限.

标签：java,multithreading

来源： https://codeday.me/bug/20190612/1227147.html