Dynamic_method_dipatch

 

package com.company;
class phone{
    public void Showtime(){
        System.out.println("12:14 pm Sunday ");
    }
    public void on(){
        System.out.println("Phone on...");
    }
}

class smartphone extends phone{
    public void on(){
        System.out.println("SmartPhone on...");
    }
    public void greet(){
        System.out.println("Welcome you ...");
    }
}
public class Dynamic_method_dispatch {
    public static void main(String[] args) {
//        phone p=new phone();
//        p.Showtime();
//        p.on();
//        smartphone sp=new smartphone();
//       sp.greet();
//       sp.on();
       phone p=new smartphone();//Correct
        /*in this one p is the object of smartphone
        and will run only the overriding function only
        and rest it will run the phone method only
        That is the concept of Dynamic method dispatch
         */
//       smartphone ph=mew phone();//Incorrect
        p.on();//in on it will run to the smartphone method i.e on()
        p.Showtime();//Allowed & run the phone method other than the overriding
//        p.greet();//Not allowed
/*     P->sp  so the overriding function and the p only
        sp->p (X )
*/
    }
}

o/p

SmartPhone on...
12:14 pm Sunday