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What (who) is class hierarchy - definition

Class hierarchies; Type hierarchy; Inheritance tree

class hierarchy

<programming> A set of classes and their interrelationships. One class may be a specialisation (a "subclass" or "{derived class}") of another which is one of its "superclasses" or "base classes". When a method is invoked on an object it is first looked for in the object's class, then the superclass of that class, and so on up the hierarchy until it is found. Thus a class need only define those methods which are specific to it, and inherits methods from all its superclasses. See also: multiple inheritance. (1997-08-06)

Class hierarchy

A class hierarchy or inheritance tree in computer science is a classification of object types, denoting objects as the instantiations of classes (class is like a blueprint, the object is what is built from that blueprint) inter-relating the various classes by relationships such as "inherits", "extends", "is an abstraction of", "an interface definition". In object-oriented programming, a class is a template that defines the state and behavior common to objects of a certain kind.

https://en.wikipedia.org/wiki/Class_hierarchy

underling

SYSTEM OF ELEMENTS WITH MULTIPLE LEVELS OR TIERS THAT ARE SUBORDINATED TO EACH OTHER

Containment hierarchy; Hierarchy member; Hierarchical relationship; Immediate subordinate; Immediate superior; Rooted hierarchy; Subordinate; Hierachy; Hierarchical; Hierarchichal; Heirarchy; Hierarchically; Hierarchies; Heirarchical; Hierarchism; Hierarchal structure; Hierarchical structure; Hiearchy; Heiarchy; Social hierarchies; Nested hierarchy; Hierarchie; Subordinates; Overlapping hierarchy; Branching hierarchy; Linear hierarchy; Flat hierarchy; Nested heirarchies; Position of authority; Hierachical; Underling; Hierarchic; Subsumptive containment hierarchy; Compositional containment hierarchy

(underlings)

You refer to someone as an underling when they are inferior in rank or status to someone else and take orders from them. You use this word to show that you do not respect someone.

...underlings who do the dirty work.

= minion

N-COUNT [disapproval]

Wikipedia

Class hierarchy

A class hierarchy or inheritance tree in computer science is a classification of object types, denoting objects as the instantiations of classes (class is like a blueprint, the object is what is built from that blueprint) inter-relating the various classes by relationships such as "inherits", "extends", "is an abstraction of", "an interface definition". In object-oriented programming, a class is a template that defines the state and behavior common to objects of a certain kind. A class can be defined in terms of other classes.

The concept of class hierarchy in computer science is very similar to taxonomy, the classifications of species.

The relationships are specified in the science of object-oriented design and object interface standards defined by popular use, language designers (Java, C++, Smalltalk, Visual Prolog) and standards committees for software design like the Object Management Group.

The class hierarchy can be as deep as needed. The Instance variables and methods are inherited down through the levels and can be redefined according to the requirement in a subclass. In general, the further down in the hierarchy a class appears, the more specialized its behavior. When a message is sent to an object, it is passed up the inheritance tree starting from the class of the receiving object until a definition is found for the method. This process is called upcasting.

https://en.wikipedia.org/wiki/Class hierarchy

Examples of use of class hierarchy

1. However cruel and nasty it was, the old social totalitarianism acted to promote ideas that it believed in – class hierarchy, religion, nationalism – and did this in total seriousness.

2. Bryan, who paid scant attention to theological controversies, was "not a fundamentalist." He "burned only and always to see religion heal the world." There was much to fix: Social Darwinists of the Gilded Age had turned the naturalist‘s ideas about "the survival of the fittest" into a tool of class hierarchy.