abstraction.java

abstract class Bike{
        abstract void run(); //declaration
        void stop()
        {
            //any logic // fallback , matlab kuch nai hai to inhe use karlo
        }
        void start(){
            //any logic
        }
    }
    
    abstract class Honda extends Bike{

        @Override
        void run() {
        //any logic    
        }
        
        abstract void hondamet();
    }
    
    class hayabu extends Honda{
        
        @Override
        void hondamet() {
            
        }
    }