摘要:
首先要理解 State Pattern 模式。 http://www.dofactory.com/net/state-design-pattern Definition Allow an object to alter its behavior when its internal state cha 阅读全文
摘要:
What does the underscore mean in the following regex? [a-zA-Z0-9_] It means to match the underscore character in addition to lowercase letters, upperc 阅读全文