Java (v)

Source: Internet
Author: User

Abstract class
1. Syntax: Add an abstract keyword to the front of the class keyword.
2. Abstract classes cannot be instantiated. However, there are still construction methods in the abstract class.
3. Abstract classes do not necessarily have abstract methods, but abstract methods must appear in abstract classes.
4. Abstract method modifier list has the abstract keyword, and the abstract method does not implement the body. with ";" End
5. Non-abstract classes inherit abstract classes, and methods in the abstract class must be implemented.
6.abstract and final cannot coexist.

Java (v)

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