JavaPracticeQuestionsonAbstractClassesAndnterfaces.java

abstract class Pen{
    abstract void write();
    abstract void refill();
}

class FountainPen extends Pen {
    void write(){
        System.out.println("Write");
    }
    void refill() {
        System.out.println("refill");
    }
    void changeNib(){
        System.out.println("Changing the nib");
    }
}

class Monkey{
    void jump(){
        System.out.println("Jumping...");
    }
    void bite(){
        System.out.println("Biting...");
    }

}
interface BasicAnimal{
    void eat();
    void sleep();
}

class Human extends Monkey implements BasicAnimal{
    void speak(){
        System.out.println("Hello sir!"); 
    }
@Override
    public void eat() {
        System.out.println("Eating");
    }
    @Override
    public void sleep() {
        System.out.println("Sleeping");
    }

}


   

class JavaPracticeQuestionsonAbstractClassesAndnterfaces{
    public static void main(String[] args) {
        FountainPen pen = new FountainPen();
        pen.changeNib();

                // Q3
                Human Ashvin = new Human();
                Ashvin.sleep();
                 // Q5
        Monkey m1 = new Human();
        m1.jump();
        m1.bite();
        // m1.speak(); --> Cannot use speak method because the reference is monkey which does not have speak method

        BasicAnimal lovish = new Human();
        // lovish.speak(); --> error
        lovish.eat();
        lovish.sleep();

    }
}