Give an example of a three-level "Is-A" hierarchy and a three-level "Has-A" hierarchy other than the...

Give an example of a three-level "Is-A" hierarchy and a three-level "Has-A" hierarchy other than the ones discussed in the lecture.

Just provide as many examples as you can,

thank you

Solutions

Expert Solution

In hierarchical model, data is organized into a tree like structure with each record is having one parent record and many children. The main drawback of this model is that, it can have only one to many relationships between nodes.

An IS-A relationship is inheritance. The classes which inherit are known as sub classes or child classes. On the other hand, HAS-A relationship is composition.

In object-oriented programming, the concept of IS-A is a totally based on Inheritance, which can be of two types Class Inheritance or Interface Inheritance. It is just like saying "A is a B type of thing". For example, Apple is a Fruit, Car is a Vehicle etc. Inheritance is uni-directional. For example, House is a Building. But Building is not a House.

Composition(HAS-A) simply mean the use of instance variables that are references to other objects. For example Maruti has Engine, or House has Bathroom.

venereology answered 1 month ago

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