private access modifier

 package com.company;

// Circle class
class circle {
    private float r;
    private float a;
    private float p;
    public void setRadius(float n){
        r=n;
    }
    public float getRadius(){
        return r;
    }
//    public void setArea(){
//        a=r*r;
//    }
    public float getArea(){
        return 3.14f*r*r;
    }
//    public void setPerimeter(){
//        p=2*3.14f*r;
//    }
    public float getPerimeter(){
        return p=2*3.14f*r;
    }

}
public class CWh_40_AccessModAndCons {
    public static void main(String[] args) {
circle cal= new circle();
cal.setRadius(4.0f);
        System.out.println(cal.getRadius());
        System.out.println(cal.getArea());
        System.out.println(cal.getPerimeter());

    }
}