At heart, we are concerned about choosing the right code path to execute within a context; old-fashioned procedural code can make equivalent decisions, OOP merely adds some elegance.

• 事实上,我们真正关心的是在上下文中选择要执行的正确代码路径;老式的过程代码可以做出同样的决定,OOP只不过使代码雅致了些。