Find area of circle, rectangle and square using Java in NetBeans (Method Overloading)

class overloading
{
    void circle(int r)
    {
        System.out.println("Area of circle "+ (3.14*r*r));
    }
    void square(int a) {
        System.out.println("Area of square "+ (a*a));
    }
    void rectangle(int l,int w)
    {
        System.out.println("Area of rectangle "+ (l*w));
    }
}
public class p21_areaofshapes {
    public static void main(String[] args) {
        overloading object=new overloading();
        object.circle(10);
        object.square(10);
        object.rectangle(20,10);
    }
}