单一功能原则

single responsibility principle

computer-programming principle that states that every class in a computer program should have responsibility over a single part of that program's functionality, which it should encapsulate

在面向对象编程领域中，单一功能原则规定每个类都应该有一个单一的功能，并且该功能应该由这个类完全封装起来。所有它的（这个类的）服务都应该严密的和该功能平行。