public class FinalParameterExample {
    public static final double PI = 3.141592653589793; 
    public final double radius;
    FinalParameterExample( double radius) {
         this.radius = radius;
    }
    public void areaOfCircle(){
	double area=PI*radius*radius;
	System.out.println("Area of Circle= "+area);
}
public static void main(String[]args){
	FinalParameterExample parameter=new FinalParameterExample(5.5);
	parameter.areaOfCircle();
}
}