Calculate

package solution;

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.lang.reflect.*;
import java.security.Permission;

class Calculate
{
    class Output{

        public void display(double volume)
        {
            System.out.printf("%.3f\n",volume);
        }
    }


    Output output;
    Scanner sc;
    public Calculate() {
        output = new Output();
        sc = new Scanner(System.in);
    }
    public int get_int_val() {
        int a = sc.nextInt();
        if(a<=0){throw new NumberFormatException("All the values must be positive");}
        return a;
    }
    public double get_double_val() {
        double a = sc.nextDouble();
        if(a<=0){throw new NumberFormatException("All the values must be positive");}
        return a;
    }
    public static Get_Vol do_calc() {
        return new Get_Vol();
    }
}

class Get_Vol extends Calculate {
    double get_volume(int val) throws IOException {
        return (val*val*val);
    }
    double get_volume(int val, int val2, int val3) throws IOException {
        return val*val2*val3;
    }
    double get_volume(double val) throws IOException {
        return Math.PI*(val*val*val) * (2.0/3.0);
    }
    double get_volume(double val, double val2)throws IOException {
        return Math.PI*(val*val)*val2;
    }
}