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Java面向对象抽象类与抽象方法的使用(关键字abstract)

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Java面向对象（19）--抽象类与抽象方法abstract

用abstract关键字来修饰一个类，这个类叫做抽象类。用abstract来修饰一个方法，该方法叫做抽象方法。抽象方法：只有方法的声明，没有方法的实现。以分号结束：比如：public abstract void talk();含有抽象方法的类必须被声明为抽象类。抽象类不能被实例化。抽象类是用来被继承...

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Java面向对象高级--抽象类的基本概念------abstract

抽象类的概念：包含一个抽象方法的类就称为抽象类。抽象方法：只声明但未实现的方法称为抽象方法，使用abstract关键字声明。抽象类的定义及使用规则： abstract class A{ // 是定义了一个抽象类 public static final String FLAG = "CHINA"...

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