1. Create a class circle and use inheritance to create another class cylinder from it

INPUT:-

package own_pratice;

class Circle{
    public int radius;
    Circle(){
        System.out.println("I am non param of circle");
    }
    Circle(int r){
        System.out.println("I am circle parameterized constructor");
        this.radius = r;
    }

    public double area(){
        return Math.PI*this.radius*this.radius;
    }
}

class Cylinder1 extends Circle{
    public int height;
    Cylinder1(int r, int h){
        super(r);
        System.out.println("I am cylinder1 parameterized constructor");
        this.height = h;
    }
    public double volume(){
        return Math.PI*this.radius*this.radius*this.height;
    }
}


public class Inheritanc2 {
public static void main(String args[]){  
  Cylinder1 obj = new Cylinder1(12, 4);
}
}

OUTPUT:-