Can anyone describe what is the correct method of dynamic method dispatch of following 2 programmes

Question

class B{
    public void p(double i){
        System.out.println("B");
    }
}
class A extends B{
    public void p(double i){
        System.out.println("A");
    }
}


class Demo{
    public static void main(String args[]){
      //way of using polymorphic 1
        A a=new A();
        a.p(10.0);

      //way of using polymorphic 2
        A a=new B();
        a.p(10.0)
    }
 }

Both 2 ways provide same answer.But I want to know what is the difference between these 2 ways of using dynamic polymorphic.what is the best way to use in a program?

The first example doesn't make use of polymorphism at all, so this appears to be a question of "should I use polymorphism / why use polymorphism / what is polymorphism good for" (ignoring the compiler errors for the time being). — Bernhard Barker, Feb 04 '18 at 18:03
Related / maybe duplicate: [What is the real significance(use) of polymorphism](https://stackoverflow.com/q/2080020) — Bernhard Barker, Feb 04 '18 at 18:06

score 1 · Answer 1 · answered Feb 04 '18 at 17:52

1

From the context and intent of polymorphism Your second way makes more sense.

answered Feb 04 '18 at 17:52

Yohannes Gebremariam

2,225
3
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score 0 · Answer 2 · answered Feb 04 '18 at 17:47

0

If a method is overridden then in the run time the method of object type will be executed. Not the reference type.

answered Feb 04 '18 at 17:47

Rumado

165
2
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Can anyone describe what is the correct method of dynamic method dispatch of following 2 programmes

2 Answers2