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抽象类在第16节继承中，有父类 People People people=new People(); people.sayHi(); 实例化People是没有意义的，因为“人”是一个抽象的概念。怎么才能避免父类的实例化呢?使用 abstract 关键字修饰类(抽象类)。抽象父类 public ...

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