Simply learn the key points and examples of Java abstract classes
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Java
Several points to note when using abstract classes:
A class containing one or more abstract methods must be declared abstract Declaring a class as an abstract class does not necessarily contain abstract methods It is generally believed that concrete methods should not be included in abstract classes. It is recommended to put general fields and methods in superclasses as far as possible Abstract classes cannot be instantiated That is, the object instance code of this class cannot be created:
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