The purpose of abstract classes is to provide an organizational mechanism for projects. Abstract classes are often used to represent abstract concepts derived from analysis and design of problem areas. They are a series of seemingly different, but essentially An abstraction of the same concrete concept.
#Abstract classes can provide an organizational mechanism for projects. Abstract classes cannot be instantiated, and can only be inherited by concrete (instantiable classes). The interface of the abstract class and all its concrete properties
Like most abstract classes, interfaces also have abstract methods. However, you cannot include concrete methods or variables in an interface as you can in an abstract class.
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Abstract classes are often used to represent abstract concepts derived from analysis and design of problem areas. They are a series of specific concepts that look different but are essentially the same. abstraction.
Classes usually modified with abstract in programming statements are abstract classes. In C, a class containing pure virtual functions is called an abstract class, which cannot generate objects; in Java, a class containing abstract methods is called an abstract class, which also cannot generate objects.
Abstract class is incomplete, it can only be used as a base class. In the object-oriented approach, abstract classes are mainly used for type hiding and acting as global variables.
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