Book Review about Head First Design Pattern 9
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State
一个类的内部有不同的状态，在执行一些操作时，会根据当时所处的状态得到不同的结果(新的状态)。一般做法是在这些操作中使用if/switch语句，但是这样不利于以后代码的修改。
使用State，创建一个Interface，定义公用的操作，根据不同状态创建相应的state子类，分别在子类中实现具体的操作。
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