circle area using class

package org.unitek.clases;

import java.util.Scanner;

public class Circulo {

    private Double radio;
    private Double area;
    private final Double pi;

    public Circulo() {
        this.pi = 3.1416;
    }

    //setters

    public void setRadio(Double _radio) {
        this.radio=_radio;
    }

    public void setArea(Double _area) {
        this.area=_area;
    }

    //getters

    public Double getRadio() {
        return this.radio;
    }

    public Double getArea() {
        return this.area;
    }

    //main function

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner x=new Scanner(System.in);
        Circulo y=new Circulo();
        System.out.println("Ingrese el radio del círculo");
        y.setRadio(x.nextDouble());
        Double area;
        area = y.pi*Math.pow(y.getRadio(), 2);
        y.setArea(area);
        System.out.println("El area del círculo es: " + area);
    }

}