abstract class in java

Summarize the class extensions that you encounter in your work: 1, class Inheritance: When more than one class is common to many methods, the common method part can be extracted, and the required class is related to inheritance. Example: Copy Code code as follows:

class is an abstract class, in which there is an abstract method, then the subclass inherits the parent class and implements (overwrites) all the abstract methods in the parent class,

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PHP abstract class, php abstract. PHP abstract class: for php programmers, the most difficult point is to count the knowledge point of PHP abstract class application. As a newbie, I hav

Python abstract base class usage instance analysis, python abstract instance analysis This example describes the usage of the python abstract base class. Share it with you for your reference. The details are as follows: To define an ab