Polymorphism

Polymorphism

1. Ad-Hoc

   • Coercion
     • Conversion of data types
       • Implicit
         • Hierarchycal
           • Integer to Real
       • Explicit
         • Casting
         • Primitive to Wrapper
         • Class to superclass
   • Overloading
     • Several functions, same name
       • int myAdd(int x, int y){....} double myAdd(double x,double y){...}
       • Arithmetical operators
         • Integer + Integer -> Integer
         • Float + Float-> Float
         • Integer + Float-> Float
       • Calculate length of list with elements of any type

2. Universal

   • Parametric / Genericity
     • Type
       • public class Entry{ private final K mKey; private final V mValue; public Entry(K k, V v){ mKey = k; mValue = v; } 
       • Entry elem1 = new Entry<>(3,”Programming”); After declaration is not needed to infer the type in the assignation.
       • Represent entries of any type in dictionary
     • Function
       • public static int lengthA(T[] inputArray){...}
       • Calculate length of list with elements of any type
   • Inclusion / Inheritance
     • Class B Inherits from Class A:
       • Attributes
       • Methods
         • Redefine
         • Use
     • One Class
       • Java
     • Several Classes
       • C++