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OOP - L4

Subtyping and Subclassing

QuestionAnswer
Also called subtyping Subtype
It is about inheriting functionality independent from the specific implementation. Subtype
Subtyping is _________ by any subtype, which means that if A is a subtype of B, then A is also a subtype of C. substitutable
A very large number fits in a long but not in an int because int has a much smaller maximum value. Subtyping
Developed in 1987 Substitution Principle
Developed by Barbara Liskov.
Liskov Substitution Principles Preconditions cannot be strengthened in a subtype - Only same or weaker requirements for subtypes
Liskov Substitution Principles Postconditions cannot be weakened in a subtypes - Only same or stronger effects for subtypes.
the Substitution Principle is applied for the reference type(List) and object type (ArrayList)
can accept any type which is a subtype of Number. add() method
objects can be added in the collection. Integer and Double
Also called as subclassing. Subclass
Allows to inherit code from a superclass and lets the user extend and add its fields and methods in addition to the superclass fields and methods. Subclass
Factored out repeated codes, write only the differences. Subclass
Created by: user-1782765
 

 



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