Can abstract classes in java be inherited?

Abstract classes can be inherited. (Recommended: java video tutorial)

1. An abstract class is just a special class, but it also has the characteristics of a class.

2. If there is an abstract method in this class, then this class must be defined as an abstract class.

3. If this abstract class inherits other abstract classes, then the abstract method does not need to be overridden.

Abstract classes contain more than one abstract method. These methods only provide function names and do not define how to implement them. They are implemented by inherited derived classes. Derived classes must implement all abstract class methods at the same time, otherwise they will It will become another abstract class in itself.

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