My code is not working. Its not reading the input properly can any one help me on this...

lass Calculate{

final Display output =new  Display();

public int get_int_val() throws IOException {
    int number =0;
    Scanner sc=new Scanner(System.in);
    if(sc.hasNextInt()){
        number = sc.nextInt();
    }else{
        sc.close();
    }


return number;
}

public double get_double_val() throws IOException{
    double number =0;
    Scanner sc=new Scanner(System.in);
    if(sc.hasNextDouble()){
        number = sc.nextDouble();
    }

    return number;
}

public static Calculate do_calc(){

    return new Calculate();
}

public double get_volume(int a){

    if(a <= 0){
        throw new NumberFormatException("All the values must be positive");
    }else{
        DecimalFormat df = new DecimalFormat("#.000");
        return Double.parseDouble(df.format(a * a * a));

    }

}

public double get_volume(int l, int b, int h){

    if(l <= 0 || b <= 0 || h <= 0){
        throw new NumberFormatException("All the values must be positive");
    }else{
        DecimalFormat df = new DecimalFormat("#.000");
        return Double.parseDouble(df.format(l * b * h));

    }

}

public double get_volume(double r){



    if(r <= 0){
        throw new NumberFormatException("All the values must be positive");
    }else{
        DecimalFormat df = new DecimalFormat("#.000");
        return Double.parseDouble(df.format((2/3)*3.14159265*(r*r*r)));

    }

}


public double get_volume(double r, double h){



    if(r <= 0 || h <=0 ){
        throw new NumberFormatException("All the values must be positive");
    }else{
        DecimalFormat df = new DecimalFormat("#.000");
        return Double.parseDouble(df.format(3.14159265*(r * r * h)));

    }

}

}

class Display{

public void display(double volume){

    System.out.println(volume);

}

}