Can we have inheritance
without polymorphism? Justify your views with valid examples.
Answers
Answer:
there can not exist a polymorphism without inheritance.
Explanation:
Static and runtime.
Static polymorphism doesn’t require inheritence.
Runtime polymorphism is based on inheritance.
// A Java program to illustrate Dynamic Method
// Dispatch using hierarchical inheritance
class A
{
void m1()
{
System.out.println("Inside A's m1 method");
}
}
class B extends A
{
// overriding m1()
void m1()
{
System.out.println("Inside B's m1 method");
}
}
class C extends A
{
// overriding m1()
void m1()
{
System.out.println("Inside C's m1 method");
}
}
// Driver class
class Dispatch
{
public static void main(String args[])
{
// object of type A
A a = n
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Let us clarify what polymorphism means and then give an example to see if it is possible without inheritance or not.
Polymorphism is the fact of a reference (variable) taking more than one form (type).
Given three types (class/interface) A, B and C where :
B extends A
C extends A
A reference of type A can take the form of an object of type B or C, therefore it can take more than one form (polymorphic).
In the previous example, the reference of type A is polymorphic because of inheritance, therefore there can not exist a polymorphism without inheritance.
So, every reference of a non final type is a possible polymorphic reference (meaning it can take more than one form).