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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)

Snippet from Wikipedia: Abstract

Abstract may refer to:

• "Abstract", a 2017 episode of the animated television series Adventure Time
• Abstract (album), 1962 album by Joe Harriott
• Abstract of title, a summary of the documents affecting the title to a parcel of land
• Abstract (law), a summary of a legal document
• Abstract (summary), in academic publishing
• Abstract art, artistic works that do not attempt to represent reality or concrete subjects
• Abstract: The Art of Design, 2017 Netflix documentary series
• Abstract music, music that is non-representational
• Abstract object in philosophy
• Abstract structure in mathematics
• Abstract type in computer science
• The property of an abstraction
• Q-Tip (musician), also known as "The Abstract"
• Abstract and concrete
• Hydrogen atom abstraction, in chemistry

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