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添加接口多态的描述
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README.md

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## 摘要:
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将实例化对象的引用赋值给超类变量,超类变量引用的是被子类重写的方法
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将实例化对象的引用赋值给超类变量,超类变量引用的是被子类重写的方法,或者
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将实例化对象的引用赋值给接口变量,接口变量引用的是被实现类重写的方法
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否则,按照继承关系的优先级调用方法:
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