Hierarchy (object-oriented programming)
In computer science's object-oriented programming, the mapped relationships of sub- and superclasses is known as a hierarchy. This can be visualized as an upside-down tree (or perhaps a pyramid), the top of which is known as the root. The issue is more complicated with languages that support multiple inheritance, where hierarchy can be any directed acyclic graph. Aggregation or Composition relationships in object-oriented design also form a hierarchy, composition hierarchy.
Hierarchy in Java The root of the java class hierarchy is the object class. See also: family tree, hierarchy, list of basic computer science topics, List_of_graph_theory_topics
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