摘要： The Strategy Pattern defines a family of algorithms,encapsulates each one, and makes them interchangeable.Strategy lets the algorithm vary independently fromclients that use it.1.Duck 问题(head frist oop)有的能飞，有的能叫，经典问题.//Duck.javapublic abstract class Duck {FlyBehavior flyBehavior;QuackBehavior quackB 阅读全文