exception, which occurs when trying to call an abstract method that is not implemented in a subclass, it usually happens in the following cases where the subclass does not overwrite the abstract method defined in the abstract class or interface, the abstract method is improperly overridden in the subclass, understanding abstract method abstract method is a function that is not implemented, it only defines the function signature, and does not provide any implementation, abstract methods are used to force the subclass to implement a specific function, interfaces and abstract classes usually contain abstract methods, and subclasses must overwrite this....
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