Difference between categories and extensions?
2015-02-05 22:20
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类别和类扩展的区别。
categories和extensions的不同在于后者可以添加属性。另外后者添加的方法是必须要实现的。
extensions可以认为是一个私有的categories。
categories和extensions的不同在于后者可以添加属性。另外后者添加的方法是必须要实现的。
extensions可以认为是一个私有的categories。
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