状况模式定义:
英文定义:The State Pattern allows an object to alter its behavior when its internal state changes. The object will appear to change its class.
英文定义:The State Pattern allows an object
状况模式定义:
英文定义:The State Pattern allows an object to alter its behavior when its internal state changes. The object will appear to change its class.
英文定义:The State Pattern allows an object