Abstract class and methods

 package com.company;

 abstract class parent{
    public parent(){
        System.out.println("Main parent ka constructor hu");
    }
    public void sayHello(){
        System.out.println("Hello");
    }
    abstract public void greet();
}
class child extends parent{
     @Override
     public void greet(){
         System.out.println(" I am a child of parent class and implementing it");
     }
}
public class CWH_53_Abstract_class_method {
    public static void main(String[] args) {
//        parent one1=new parent();\
        parent two= new child();
        child one;
        one = new child();
        one.greet();
        two.greet();
    }
}