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In philosophy and the arts, a fundamental distinction exists between abstract and concrete entities. While there is no universally accepted definition, common examples illustrate the difference: numbers, sets, and ideas are typically classified as abstract objects, whereas plants, dogs, and planets are considered concrete objects.
Abstract Objects: An Introduction to Axiomatic Metaphysics (1983) is the title of a publication by Edward Zalta that outlines abstract object theory.. AOT is a dual predication approach (also known as "dual copula strategy") to abstract objects [3] influenced by the contributions of Alexius Meinong [4] [5] and his student Ernst Mally.
Each object and link on an object diagram is represented by an InstanceSpecification. This can show an object's classifier (e.g. an abstract or concrete class) and instance name, as well as attributes and other structural features using slots. Each slot corresponds to a single attribute or feature, and may include a value for that entity.
[1]: 78 An object can model some part of reality or can be an invention of the design process whose collaborations with other such objects serve as the mechanisms that provide some higher-level behavior. Put another way, an object represents an individual, identifiable item, unit, or entity, either real or abstract, with a well-defined role in ...
abstract factory pattern, which provides an interface for creating related or dependent objects without specifying the objects' concrete classes. [3] builder pattern, which separates the construction of a complex object from its representation so that the same construction process can create different representations.
The authors employ the term 'toolkit' where others might today use 'class library', as in C# or Java. In their parlance, toolkits are the object-oriented equivalent of subroutine libraries, whereas a 'framework' is a set of cooperating classes that make up a reusable design for a specific class of software. They state that applications are hard ...
Paradigmatically, universals are abstract (e.g. humanity), whereas particulars are concrete (e.g. the personhood of Socrates). However, universals are not necessarily abstract and particulars are not necessarily concrete. [3] For example, one might hold that numbers are particular yet abstract objects.
Provides an interface for creating families of related or dependent objects without specifying their concrete classes. Builder pattern: Allows for the step-by-step construction of complex objects, separating the construction process from its representation. Prototype pattern: Creates new objects by copying an existing object, known as the ...