state
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状态模式
Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.（当一个对象内在改变的时候允许其改变行为，这个对象看起来像改变了其类。）
2017-01-26 pattern-designpattern-designstate
Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.（当一个对象内在改变的时候允许其改变行为，这个对象看起来像改变了其类。）