Always make the abstract parent class implement an interface. The Template Method design pattern is especially valuable in framework design (discussed towards the end of this chapter).

总是使抽象父类实现一个接口。模板方法设计模式在框架设计中特别有价值(在这章的结尾讨论了)。

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The Template Method design pattern (GoF) addresses a common problem: we know the steps of an algorithm and the order in which they should be performed, but don't know how to perform all of the steps.

模板方法设计模式(gof)强调了一个普遍的问题：我们知道算法的每一步，并且知道他们执行的顺序，但是我们不知道怎么样去执行所有的这些步骤。

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The Strategy design pattern takes a little more work to implement than the Template Method pattern, but it is more flexible.

策略设计模式比模板方法模式花费了更多的工作去实现，但是它也更灵活。

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