1. Abstract typeIn programming languages, an abstract type is a type in a nominative type system which cannot be instantiated. (However, it may have concrete subtypes that do have instances. ) An abstract type may have no implementation, or an incomplete implementation. It may include abstract methods or abstract properties that are shared by its subtypes. A type that is not abstract is called a concrete type. In many object oriented programming languages, abstract types are known as abstract base classes.
Read “Abstract type” on English Wikipedia
Read “抽象型” on Japanese Wikipedia
Read “Abstract type” on DBpedia
Read “Abstract type” on English Wikipedia
Read “抽象型” on Japanese Wikipedia
Read “Abstract type” on DBpedia
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