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Abstract

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See Abstract class, Abstract method, abstract data structure, abstraction

* Java abstract - The abstract keyword is used to declare abstract methods and abstract classes. An abstract method has no implementation defined; it is declared with arguments and a return type as usual, but the body enclosed in curly braces is replaced with a semicolon. The implementation of an abstract method is provided by a subclass of the class in which it is defined. If an abstract method appears in a class, the class is also abstract. Attempting to instantiate an abstract class will fail at compile time." (LrnJav 2023)

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