Inheritance in Java and super calling

Hello I am new to Java and learning Inheritance.
This is my code:

import java.util.Scanner;
import java.lang.Math;
class Circle{
        double radius;
        Circle(double radius){
            this.radius = radius;
        }
        
        double area(){
            return((Math.PI)*Math.pow(radius,2));
        }
  
        
}

class Sector extends Circle{
        double radians;
        int radius;
    
        Sector(int radius , double radians){
            super(radius);
            this.radians = radians;
        }
        
        double area(){
            return 1/2 * radius*radius * radians;
        }
}

        
public class Inherit{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        System.out.println("enter radius of circle");
        int radius = sc.nextInt();
        System.out.println("Ener radians");
        double rad = sc.nextDouble();
        Sector c = new Sector(radius , rad);
        System.out.println("area is:" + c.area());
    }
}

However cant really understand why the area im getting is 0.
Any suggestions appreciated.
Another thing that I didnt understand is the fact that, if the change the

Sector(int radius , double radians){
                super(radius);
                this.radians = radians;
            }

to,

Sector(int radius , double radians){
                this.radius = radius;
                this.radians = radians;
            }

the compiler throws another error.Can anyone please explain these two abominations?

>Solution :

You have to remove the radius in your Sector class and you have to fix the method area in this way:

double area() {
    return 1 / 2d * radius * radius * radians;
}

The operation 1 / 2 is a division between integers than the result is 0.

0 * radius * radius * radians

If you put 2d, the division 1 / 2d will be double.

0.5d * radius * radius * radians